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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. In the GMAW process what does amperage control?

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

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

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

5. List the basic equipment requirements for the GMAW process

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

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

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

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

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

11. What does inductance control?

12. List several industries that would use GMAW

13. When is the metal transferred with short circuit transfer?

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

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

16. Regulators control_____________ flowmeters SHOW____________.

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

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

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

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

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

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

23. What does the wire feeder control?

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

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

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

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

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

29. What happens when the electrode extension is increased?

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

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

32. What is the preferred drive roll design for solid wires?

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

34. What controls amperage when using GMAW?

35. What is the effect of too much slope?

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

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

38. What does the term GMAW identify?

39. Give a brief description of the GMAW process

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

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

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

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

44. Give a description of 'pinch effect'

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

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

47. In the GMAW process what does voltage control?

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

49. What does the abbreviation NEMA stand for?

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