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Gas Metal Arc Welding

Subject : engineering
  • Answer 50 questions in 15 minutes.
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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 the basic equipment requirements for the GMAW process

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

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

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

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

6. A machine with a 70% duty cycle can run at its max for 7 minutes with a cooling cycle of only _ minutes.

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

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

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

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

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

12. What are the 2 types of wire feeders available?

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

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

15. What does the abbreviation NEMA stand for?

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

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

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

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

20. What does the term GMAW identify?

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

22. What controls amperage when using GMAW?

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

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

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

26. What happens when the electrode extension is increased?

27. What does inductance control?

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

29. Give a description of 'pinch effect'

30. What 2 controls are found on a GMAW set- up?

31. What is the maximum distance that hard wire can be successfully pushed?

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

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

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

35. List several industries that would use GMAW

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

37. What does the wire feeder control?

38. Give a brief description of the GMAW process

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

40. In the GMAW process what does amperage control?

41. Why is globular transfer generally avoided with GMAW?

42. In the GMAW process what does voltage control?

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

44. A pull type drive system is usually used on what type of material?

45. List the three methods of metal transfer with GMAW

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

47. Why is a fiber washer required and what cylinder gas requires it?

48. What is the effect of too much slope?

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

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