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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. What controls amperage when using GMAW?

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

3. Give a brief description of the GMAW process

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

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

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

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

8. What does voltage do in an electrical circuit?

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

10. List 3 wire drive systems and give a short description of each

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

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

13. What does the abbreviation NEMA stand for?

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

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

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

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

18. List the three methods of metal transfer with GMAW

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

20. What is the effect of too much slope?

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

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

23. What does the term GMAW identify?

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

25. Give a description of 'pinch effect'

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

27. In the GMAW process what does voltage control?

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

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

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

31. What happens when the electrode extension is increased?

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

33. List several industries that would use GMAW

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

35. How are GMAW guns rated?

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

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

38. Why is globular transfer generally avoided with GMAW?

39. What does the wire feeder control?

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

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

42. How many times per second does short circuiting take place?

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

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

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

46. Regulators control_____________ flowmeters SHOW____________.

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

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

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

50. What 2 organizations designate specifications for GMAW wires?