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Gas Metal Arc Welding

Subject : engineering
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. List several industries that would use GMAW

2. What output on the welding machine is used to rate the duty cycle?

3. What is the effect of too much slope?

4. What controls the wire speed on a voltage sensing wire feeder?

5. What wire are knurled drive rolls most commonly used on?

6. Is the arc voltage for spray transfer higher or lower than that used for short circuit transfer?

7. How are GMAW guns rated?

8. List the basic equipment requirements for the GMAW process

9. With straight polarity where is 2/3 of the arc energy?

10. What processes are constant current (CC) power sources designed to be used with?

11. What is the purpose of the shielding gas used in GMAW?

12. Why must CO2 cylinders be used in the vertical position?

13. What is the reason glass 'tube' type flowmeters must have the tube mounted truly vertical?

14. What is the disadvantage of the gauge preset type of regulator/flowmeter?

15. Why is the term GMAW preferred over MIG or MAG?

16. What would be an indication that the drive roll pressure is adjusted correctly?

17. What type of power source is used with a constant speed wire feeder?

18. What does the wire feeder control?

19. What is the minimum % value of argon that must be present to use the spray transfer method of GMAW?

20. When using flat drive rolls with too much pressure on copper coated solid wires what problem could take place?

21. What does voltage do in an electrical circuit?

22. What power sources are used with the GMAW Process?

23. What is the key advantage of short circuiting transfer?

24. What term is used to describe when the workpiece is hooked to the negative pole on the power source?

25. List the factors that determine the mode of metal transfer

26. What happens when the electrode extension is increased?

27. In the GMAW process what does voltage control?

28. Draw a typical volt/amp curve that would be found with a power source designed for SMAW or GTAW

29. What is an advantage of pulsed arc transfer with GMAW?

30. What is a solenoid valve and what actuates it?

31. What 2 organizations designate specifications for GMAW wires?

32. What does a flowmeter do and what does it measure?

33. What is another term for electrode holders for GMAW?

34. Why is globular transfer generally avoided with GMAW?

35. What is the purpose of the pick- up lead on a voltage sensing wire feeder?

36. Why is a line heater required when using GMAW?

37. Regulators control_____________ flowmeters SHOW____________.

38. What is the main purpose of 'slope'?

39. What is the recommended electrode stick- out for .035 solid wire?

40. What type of power source is commonly used with a voltage sensing wire feeder?

41. What does inductance control?

42. What is a typical flow rate of CO2 for short circuit transfer?

43. Draw a typical volt amp curve for a machine that is designed for GMAW

44. What current and polarity is generally used with GMAW?

45. List 3 forms compressed gases may be supplied for welding

46. A 10 minute cycle of welding time vs cooling time a given machine can handle.

47. What controls amperage when using GMAW?

48. What is the required arc voltage used for short circuit transfer?

49. What is the purpose of a regulator and what does it indicate on its gauges?

50. What effect does increasing and decreasing the inductance have on the weld?