120 Chapter Reviews
Weld 120 SMAW Chapter Reviews Name: _______________________________________ Date: _____________ SUMMER SCHEDULE Required Reading: Welding Principals and Applications 7th Edition Larry Jeffus Due Week 2: Review Test Chapter 3 – Shielded Metal Arc Equipment, Setup and Operation (30 points). Review Test Chapter 4 – Shielded Metal Arc Welding of Plate (25 points). Review Test Chapter 25 – Welding Metallurgy (41 points). Due Week 3: Review Test Chapter 21 – Fabricating Techniques and Practices (25 points). Review Test Chapter 22 – Welding Codes and Standards (11 points). Review Test Chapter 23 – Testing and Inspection of Welds (39 points). Due Week 4: Review Test Chapter 5 – Shielded Metal Arc Welding of Pipe (20 points). Review Test Chapter 6 – Advanced Shielded Metal Arc Welding (23 points). Weld 120 SMAW Chapter Reviews Page 1 of 29 (Revised 7-1-2014) THIS PAGE LEFT INTENTIONALLY BLANK Weld 120 SMAW Chapter Reviews Page 2 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Chapter 3 Name: _______________________________________ Date: _____________ Required Reading: (Welding Principals and Applications 7th Edition Larry Jeffus Chapter 3) Review Test Chapter 3 answer all questions 1 through 30 Total Points (30) 1. Describe the welding current _____________________________________________________________________________________ 2. What produces the heat during a shielded metal arc weld? _____________________________________________________________________________________ 3. Voltage can be described as? _____________________________________________________________________________________ 4. Amperage can be described as? _____________________________________________________________________________________ 5. Wattage can be described as? _____________________________________________________________________________________ 6. What determines the exact temperature of the shielded metal welding arc? _____________________________________________________________________________________ _____________________________________________________________________________________ 7. Does all of the heat produced by an SMA weld stay in the weld? Why or why not? _____________________________________________________________________________________ _____________________________________________________________________________________ 8. What do the following abbreviations mean: AC, DCEN, DCEP, DCSP, and DCRP? _____________________________________________________________________________________ _____________________________________________________________________________________ 9. Sketch a welding machine, an electrode lead, an electrode holder, an electrode, a work lead, and work connected for DCEN welding. See Figure 3-6. 10. Sketch a welding machine, an electrode lead, an electrode holder, an electrode, a work lead, and work connected for DCEP welding. See Figure 3-7. Weld 120 SMAW Chapter Reviews Page 3 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Chapter 3 Name: _______________________________________ Date: _____________ 11. Why is SMA welding current referred to as constant current? _____________________________________________________________________________________ 12. What is the higher voltage at the electrode before the arc is struck called? What is its advantage to welding? _____________________________________________________________________________________ 13. Referring to the graph in Figure 3-9, what would the voltage be for the CC power supply at 110 amps? What would the watts be? _____________________________________________________________________________________ 14. How does arc blow affect welding? _____________________________________________________________________________________ _____________________________________________________________________________________ 15. How can arc blow be controlled? _____________________________________________________________________________________ _____________________________________________________________________________________ 16. How does a welding transformer work? _____________________________________________________________________________________ _____________________________________________________________________________________ 17. What are taps on a welding transformer? _____________________________________________________________________________________ 18. What would the approximate amperage setting be if a welder were set to the high range (150 to 350 amps) and the fine adjustment knob were pointing at 5 on a 10-point scale? _____________________________________________________________________________________ _____________________________________________________________________________________ 19. What are the advantages of the inverter-type welding power supply? _____________________________________________________________________________________ 20. What is the difference between the welding current produced by alternators and by generators? _____________________________________________________________________________________ _____________________________________________________________________________________ 21. What are the advantages of alternators over generators? _____________________________________________________________________________________ _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 4 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Chapter 3 Name: _______________________________________ Date: _____________ 22. What must be checked before using the 110-volt power plug on a portable welder? _____________________________________________________________________________________ 23. What is meant by a welder’s duty cycle? _____________________________________________________________________________________ 24. Why must a welding machine’s duty cycle never be exceeded? _____________________________________________________________________________________ _____________________________________________________________________________________ 25. Why is copper better than aluminum for welding cables? _____________________________________________________________________________________ 26. A splice in a welding cable should never be any closer than __________ to the electrode holder. 27. Why must the electrode holder be correctly sized? _____________________________________________________________________________________ _____________________________________________________________________________________ 28. What can cause a properly sized electrode holder to overheat? _____________________________________________________________________________________ 29. What problem can occur if welding machines are stacked or placed too closely together? _____________________________________________________________________________________ 30. Why welding cables must never be tied to scaffolding or ladders? _____________________________________________________________________________________ _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 5 of 29 (Revised 7-1-2014) THIS PAGE LEFT INTENTIONALLY BLANK Weld 120 SMAW Chapter Reviews Page 6 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Chapter 4 Name: _______________________________________ Date: _____________ Required Reading: (Welding Principals and Applications 7th Edition Larry Jeffus Chapter 4) Review Test Chapter 4 answer all questions 1 through 25 Total Points (25) 1. Describe two or more methods of striking an arc with an electrode. _____________________________________________________________________________________ _____________________________________________________________________________________ 2. Why is it important to strike the arc only in the weld joint? _____________________________________________________________________________________ _____________________________________________________________________________________ 3. What problems may result by using an electrode at too low a current setting? _____________________________________________________________________________________ _____________________________________________________________________________________ 4. What problems may result by using an electrode at too high a current setting? _____________________________________________________________________________________ _____________________________________________________________________________________ 5. According to Table 4-1, what would the amperage range be for the following electrodes? a. 1/8 in. (3.2 mm), E6010 ______________ b. 5/32 in. (4 mm), E7018 ______________ c. 3/32 in. (2.4 mm), E7016 ______________ d. 1/8 in. (3.2 mm), E6011 ______________ 6. What makes some spatter “hard”? _____________________________________________________________________________________ 7. Why should you never change the current setting during a weld? _____________________________________________________________________________________ _____________________________________________________________________________________ 8. What factors should be considered when selecting an electrode size? _____________________________________________________________________________________ _____________________________________________________________________________________ 9. What can a welder do to control overheating of the metal pieces being welded? _____________________________________________________________________________________ _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 7 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Chapter 4 Name: _______________________________________ Date: _____________ 10. What effect does changing the arc length have on the weld? _____________________________________________________________________________________ 11. What arc problems can occur in deep or narrow weld joints? _____________________________________________________________________________________ 12. Describe the difference between using a leading and a trailing electrode angle. _____________________________________________________________________________________ _____________________________________________________________________________________ 13. Can all electrodes be used with a leading angle? Why or why not? _____________________________________________________________________________________ 14. What characteristics of the weld bead does weaving of the electrode cause? _____________________________________________________________________________________ 15. What are some of the applications for the circular pattern in the flat position? _____________________________________________________________________________________ 16. Draw two complete lines of the weave patterns you are most comfortable making. Weld 120 SMAW Chapter Reviews Page 8 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Chapter 4 Name: _______________________________________ Date: _____________ 17. Why is it important to find a good welding position? _____________________________________________________________________________________ _____________________________________________________________________________________ 18. Which electrodes would be grouped in the following F numbers: F3, F2, F4? a. F3 _______________ b. F2 _______________ c. F4 _______________ 19. Give one advantage of using electrodes with cellulose-based fluxes. _____________________________________________________________________________________ 20. What are stringer beads? _____________________________________________________________________________________ _____________________________________________________________________________________ 21. Describe an ideal tack weld _____________________________________________________________________________________ 22. What effect does the root opening or root gap have on a butt joint? _____________________________________________________________________________________ 23. What can happen if the fillet weld on a lap joint does not have a smooth transition? _____________________________________________________________________________________ 24. Which plate heats up faster on a tee joint? Why? _____________________________________________________________________________________ 25. Can a tee weld be strong if the welds on both sides do not have deep penetration? Why or why not? _____________________________________________________________________________________ _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 9 of 29 (Revised 7-1-2014) THIS PAGE LEFT INTENTIONALLY BLANK Weld 120 SMAW Chapter Reviews Page 10 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Ch. 25 Name: _______________________________________ Date: _____________ Required Reading: (Welding Principals and Applications 7th Edition Larry Jeffus Chapter 25) Review Test Chapter 25 answer all questions 1 through 41 Total Points (41) 1. What gives metals their desirable properties? _____________________________________________________________________________________ 2. What is heat? _____________________________________________________________________________________ 3. What are the basic units of measure for heat? _____________________________________________________________________________________ 4. What is sensible heat? _____________________________________________________________________________________ 5. What is latent heat? _____________________________________________________________________________________ 6. What does the color of light given off from a hot object indicate? _____________________________________________________________________________________ 7. What is a crystal lattice? _____________________________________________________________________________________ 8. Why does metal not form into one large, single crystal? _____________________________________________________________________________________ 9. What is an alloy? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 11 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Ch. 25 Name: _______________________________________ Date: _____________ 10. Using Figure 25-14, answer the following questions: a. At approximately what temperature does a 70% lead and 30% tin mixture become solid? _________________ b. What crystal structure is formed first when a 20% lead and 80% tin mixture cools down from a 100% liquid phase? _________________ 11. What is a eutectic composition? _____________________________________________________________________________________ 12. Using Table 25-3, what are the lowest and highest carbon contents of iron-carbon alloys? _____________________________________________________________________________________ 13. Approximately how many degrees wide is the transition range at the 0.1% carbon alloy? _____________________________________________________________________________________ 14. Referring to Figure 25-16, what color would low carbon steel appear when it is in the transition range? _____________________________________________________________________________________ 15. Referring to Figure 25-16, what is the approximate temperature of the lower transformation temperature? _____________________________________________________________________________________ 16. What three factors affect the size and type of crystals formed in an iron-carbon alloy? _____________________________________________________________________________________ 17. Referring to Figure 25-16, above what temperature is a 0.1% iron-carbon alloy nonmagnetic? _____________________________________________________________________________________ 18. What is the most significant factor that affects how much of an alloying element remains trapped in the iron-carbon crystals? _____________________________________________________________________________________ 19. What is known as the critical temperature of iron-carbon alloys? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 12 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Ch. 25 Name: _______________________________________ Date: _____________ 20. Can a metal have all the mechanical properties at ideal levels? Why or why not? _____________________________________________________________________________________ 21. What other properties can a metal’s hardness reveal? _____________________________________________________________________________________ 22. Which property, brittleness or ductility, will let a metal deform without breaking? Why? _____________________________________________________________________________________ 23. What is toughness? _____________________________________________________________________________________ 24. What are the common types of strength measurements? _____________________________________________________________________________________ 25. What is a major advantage of solid-solution-strengthened alloys? _____________________________________________________________________________________ 26. What are the three steps in precipitation hardening? _____________________________________________________________________________________ _____________________________________________________________________________________ 27. How do ferrite and cementite work together to form a strong ductile steel? _____________________________________________________________________________________ 28. Why is brine quenching faster than water quenching? _____________________________________________________________________________________ 29. What can be done to speed up the quenching rate in any liquid? _____________________________________________________________________________________ 30. Why is the formation of martensite a problem when welding on high carbon steels? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 13 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Ch. 25 Name: _______________________________________ Date: _____________ 31. How can the effects of cold working be removed? _____________________________________________________________________________________ 32. How can large-grain crystals be made into smaller sizes? _____________________________________________________________________________________ 33. Referring to Figure 25-16, what would the preheat temperature range be for an iron-carbon alloy with 0.6% carbon? _____________________________________________________________________________________ 34. Why must the stress-relieving temperature be kept below the critical temperature of the plate? _____________________________________________________________________________________ 35. What properties can annealing produce in metals? _____________________________________________________________________________________ 36. How long does it take the weld metal to go through its thermal cycle during a weld? _____________________________________________________________________________________ 37. What are some sources of hydrogen that can contaminate a weld? _____________________________________________________________________________________ 38. How can nitrogen get into an SMAW weld? _____________________________________________________________________________________ 39. What are some of the problems that oxygen can cause in welds? _____________________________________________________________________________________ 40. When do cold cracks develop? _____________________________________________________________________________________ 41. What is carbide precipitation? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 14 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Ch. 21 Name: _______________________________________ Date: _____________ Required Reading: (Welding Principals and Applications 7th Edition Larry Jeffus Chapter 21) Review Test Chapter 21 answer all questions 1 through 25 Total Points (25) 1. List precautions you must take when welding around workers who are not welders. _____________________________________________________________________________________ _____________________________________________________________________________________ 2. What is a cost advantage of using preformed parts in a fabrication? _____________________________________________________________________________________ 3. Why is a prototype custom fabricated before producing multiple weldments? _____________________________________________________________________________________ 4. How would a small or tight tolerance affect the layout? _____________________________________________________________________________________ 5. How can circles, arcs, and curves be laid out? _____________________________________________________________________________________ 6. Which cutting process does not produce a kerf space? _____________________________________________________________________________________ 7. What is kerf space? _____________________________________________________________________________________ 8. Which of the cutting processes can leave the smallest kerf? _____________________________________________________________________________________ 9. What are two common ways to provide for the kerf spacing? _____________________________________________________________________________________ 10. What can a template be made of? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 15 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Ch. 21 Name: _______________________________________ Date: _____________ 11. What is the difference between plate and sheet material? _____________________________________________________________________________________ 12. What is a part’s tolerance? _____________________________________________________________________________________ 13. What can you do to make parts fit without having to recut or regrind them? _____________________________________________________________________________________ 14. Why should you avoid re-cutting or grinding parts whenever possible? _____________________________________________________________________________________ 15. What problem can result if the root opening of a weld is too wide? _____________________________________________________________________________________ _____________________________________________________________________________________ 16. What is the benefit of identifying a single part as the base during assembly? _____________________________________________________________________________________ 17. List three types of clamps used to temporarily hold parts in place so that they can be tack welded. _____________________________________________________________________________________ 18. What makes some C-clamps better for welding than others? _____________________________________________________________________________________ 19. What is a simple way of correcting slight alignment problems? _____________________________________________________________________________________ 20. What precautions should be taken if a hammer is used to shift a part into alignment? _____________________________________________________________________________________ 21. What is the purpose of tack welds? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 16 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Ch. 21 Name: _______________________________________ Date: _____________ 22. How many tack welds should be used on thin metal compared to thicker metal parts? _____________________________________________________________________________________ 23. Does it matter if one of the tack welds breaks during welding and why? _____________________________________________________________________________________ 24. Why is it important not to strike the arc outside of the weld joint? _____________________________________________________________________________________ 25. What can happen if a grinding stone with a lower-rated RPM than the grinder is used? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 17 of 29 (Revised 7-1-2014) THIS PAGE LEFT INTENTIONALLY BLANK Weld 120 SMAW Chapter Reviews Page 18 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Ch. 22 Name: _______________________________________ Date: _____________ Required Reading: (Welding Principals and Applications 7th Edition Larry Jeffus Chapter 22) Review Test Chapter 22 answer all questions 1 through 11 Total Points (11) 1. Why is it important to select the correct welding code or standard? _____________________________________________________________________________________ 2. What are codes and standards? _____________________________________________________________________________________ 3. What is the difference between welding codes or standards and welding specifications? _____________________________________________________________________________________ _____________________________________________________________________________________ 4. What might influence the selection of a particular code or specification for welding? _____________________________________________________________________________________ 5. As stricter standards are applied to the welding process, what happens to the cost of the weldment? _____________________________________________________________________________________ 6. What can happen if welding standards are lax? _____________________________________________________________________________________ 7. What are three commonly used codes? _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ 8. What is a WPS? _____________________________________________________________________________________ _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 19 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Ch. 22 Name: _______________________________________ Date: _____________ 9. What information should be included in a WPS? _____________________________________________________________________________________ _____________________________________________________________________________________ 10. What is the form called that records the parameters used to produce a test weld? _____________________________________________________________________________________ 11. Who should witness the test welding being performed for a tentative WPS? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 20 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Ch. 23 Name: _______________________________________ Date: _____________ Required Reading: (Welding Principals and Applications 7th Edition Larry Jeffus Chapter 23) Review Test Chapter 23 answer all questions 1 through 39 Total Points (39) 1. Why are all welds not inspected to the same level or standard? _____________________________________________________________________________________ 2. Why is the strength of all production parts not known if a sample number of parts is mechanically tested? _____________________________________________________________________________________ 3. Why is it possible to do more than one nondestructive test on a weldment? _____________________________________________________________________________________ 4. What is a discontinuity? _____________________________________________________________________________________ 5. What is a defect? _____________________________________________________________________________________ 6. What is tolerance? _____________________________________________________________________________________ 7. What are the 12 most common discontinuities? _____________________________________________________________________________________ 8. How can porosity form in a weld and not be seen by the welder? _____________________________________________________________________________________ 9. What welding process can cause porosity to form? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 21 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Ch. 23 Name: _______________________________________ Date: _____________ 10. How is piping porosity formed? _____________________________________________________________________________________ 11. What are inclusions, and how are they caused? _____________________________________________________________________________________ _____________________________________________________________________________________ 12. When does inadequate joint penetration usually become defective? _____________________________________________________________________________________ _____________________________________________________________________________________ 13. How can a notch cause incomplete fusion? _____________________________________________________________________________________ _____________________________________________________________________________________ 14. How can an arc strike appear on a guided-bend test? _____________________________________________________________________________________ 15. What is overlap? _____________________________________________________________________________________ 16. What is undercut? _____________________________________________________________________________________ 17. What causes crater cracks? _____________________________________________________________________________________ 18. What is underfill? _____________________________________________________________________________________ 19. What is the difference between a lamination and a delamination? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 22 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Ch. 23 Name: _______________________________________ Date: _____________ 20. How can stress be reduced through a plate’s thickness to reduce lamellar tearing? _____________________________________________________________________________________ 21. What would be the tensile strength in pounds per square inch of a specimen measuring 0.375 in. thick and 1.0 in. wide if it failed at 27,000 lb? _____________________________________________________________________________________ 22. What would be the elongation for a specimen for which the original gauge length was 2 in. and final gauge length was 2.5 in.? _____________________________________________________________________________________ 23. How are the results of a stress test reported? _____________________________________________________________________________________ 24. What would be the transverse shear strength per inch of weld if a specimen that was 2.5 in. wide withstood 25,000 lb? _____________________________________________________________________________________ 25. What would be the longitudinal shearing strength per millimeter of a specimen that was 50.8 mm wide and 116 mm long and withstood 23,200 kg? _____________________________________________________________________________________ 26. What are the three methods of destructive testing of a welded butt joint? _____________________________________________________________________________________ 27. How are the specimens bent for a guided-, root-, face-, and side-bend test? _____________________________________________________________________________________ 28. How wide should a specimen be if the material thickness is _____________________________________________________________________________________ 29. Why are guide lines drawn on the surface of a free-bend specimen? _____________________________________________________________________________________ 30. What part of a fillet weld break test is examined? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 23 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Ch. 23 Name: _______________________________________ Date: _____________ 31. What can happen if acids are handled carelessly? _____________________________________________________________________________________ 32. What information about the weld does an impact test provide? _____________________________________________________________________________________ 33. Which nondestructive test is most commonly used? _____________________________________________________________________________________ 34. List the five steps to be followed when using a penetrant test. _____________________________________________________________________________________ 35. What properties must metal have before it can be tested with the MT process? _____________________________________________________________________________________ 36. Why will some flaws appear larger on an X ray than they are in the weld? _____________________________________________________________________________________ 37. How is the size of a flaw determined using ultrasonic inspection? _____________________________________________________________________________________ 38. What is the major limitation of eddy current inspection? _____________________________________________________________________________________ 39. What information does a hardness test reveal? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 24 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Chapter 5 Name: _______________________________________ Date: _____________ Required Reading: (Welding Principals and Applications 7th Edition Larry Jeffus Chapter 5) Review Test Chapter 5 answer all questions 1 through 20 Total Points (20) 1. List some applications that use low-pressure piping. _____________________________________________________________________________________ 2. List some applications that use medium-pressure piping. _____________________________________________________________________________________ 3. List some applications that use high-pressure piping. _____________________________________________________________________________________ _____________________________________________________________________________________ 4. Describe the differences between pipe and tubing. _____________________________________________________________________________________ _____________________________________________________________________________________ 5. What are the advantages of welded piping systems over other joining methods? _____________________________________________________________________________________ _____________________________________________________________________________________ 6. Why must the ends of pipe be beveled before being welded? _____________________________________________________________________________________ 7. How can the ends of a pipe be beveled? _____________________________________________________________________________________ 8. Why is the end of a pipe beveled at a 37 1/2° angle? _____________________________________________________________________________________ 9. What causes root suck back or a concave root face? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 25 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Chapter 5 Name: _______________________________________ Date: _____________ 10. Why are arc strikes outside the welding zone considered a problem on pipe? _____________________________________________________________________________________ 11. What are the purposes of backing rings? _____________________________________________________________________________________ 12. What is the purpose of a hot pass? _____________________________________________________________________________________ 13. Why must the weld crater be cleaned before starting a new electrode? _____________________________________________________________________________________ 14. What is the maximum width of the cover pass? Why? _____________________________________________________________________________________ 15. When is the 1G welding position used? _____________________________________________________________________________________ 16. How can the start of a weld be made less narrow and more uniform? _____________________________________________________________________________________ 17. What supports the welds on a 2G pipe joint? _____________________________________________________________________________________ 18. On 5G welds, what usually determines the direction of the root pass? _____________________________________________________________________________________ 19. What three welding positions are incorporated in the 6G welding position? _____________________________________________________________________________________ 20. Why are small multi-pass stringer beads best for 6G welds? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 26 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Chapter 6 Name: _______________________________________ Date: _____________ Required Reading: (Welding Principals and Applications 7th Edition Larry Jeffus Chapter 6) Review Test Chapter 6 answer all questions 1 through 23 Total Points (23) 1. Why are some weld joints grooved? _____________________________________________________________________________________ _____________________________________________________________________________________ 2. Sketch four of the standard grooves used for welded joints. 3. Why are some backing strips removed from the finished weld? _____________________________________________________________________________________ 4. Why are backing tapes used on some joints? _____________________________________________________________________________________ 5. Why is it very important to make a weld with a good root surface? _____________________________________________________________________________________ 6. What are the two common methods of making a root pass on an open root joint? _____________________________________________________________________________________ _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 27 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Chapter 6 Name: _______________________________________ Date: _____________ 7. How can small gaps between the weld plate and backing strip be closed? _____________________________________________________________________________________ 8. What effect does changing from a trailing angle to a leading angle have on a weld? _____________________________________________________________________________________ 9. What benefit would there be to the root pass if the electrode holder were rocked back and forth while keeping the electrode tip in the joint? _____________________________________________________________________________________ 10. What might cause the bright color on the flux as a weld cools? _____________________________________________________________________________________ 11. What can happen if the molten weld pool becomes too large on a root weld? _____________________________________________________________________________________ 12. What can be done to increase the amount of high-strength welding electrode in the final weld if the root weld was made with a low-alloy electrode? _____________________________________________________________________________________ 13. What is the purpose of the hot pass? _____________________________________________________________________________________ 14. Why should a filler weld pass not have deep penetration? _____________________________________________________________________________________ 15. Why is it important to have a good cover pass? _____________________________________________________________________________________ 16. What can watching the back edge of a weld pool help you determine? _____________________________________________________________________________________ 17. Other than penetration, why would thick butt joints be grooved on both sides? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 28 of 29 (Revised 7-1-2014) Weld 120 SMAW Review Test Chapter 6 Name: _______________________________________ Date: _____________ 18. List the things that a weld must be inspected for before it is ground for bend testing. _____________________________________________________________________________________ _____________________________________________________________________________________ 19. What determines the acceptance or rejection of a bend specimen? _____________________________________________________________________________________ _____________________________________________________________________________________ 20. What technique can be used to make restarting weld beads easier and more uniform? _____________________________________________________________________________________ _____________________________________________________________________________________ 21. Why should some weldments be preheated before welding starts? _____________________________________________________________________________________ _____________________________________________________________________________________ 22. What is post heating used for? _____________________________________________________________________________________ 23. How can a wide gap in a joint be closed by welding? _____________________________________________________________________________________ Weld 120 SMAW Chapter Reviews Page 29 of 29 (Revised 7-1-2014)
© Copyright 2024