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

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

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

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

6. What is the effect of too much slope?

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

8. Why is globular transfer generally avoided with GMAW?

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

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

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

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

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

14. Regulators control_____________ flowmeters SHOW____________.

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

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

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

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

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

20. Give a description of 'pinch effect'

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

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

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

24. What does voltage do in an electrical circuit?

25. What 2 organizations designate specifications for GMAW wires?

26. What does inductance control?

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

28. What does the term GMAW identify?

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

30. What does the abbreviation NEMA stand for?

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

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

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

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

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

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

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

38. In the GMAW process what does voltage control?

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

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

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

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

43. List the three methods of metal transfer with GMAW

44. What controls amperage when using GMAW?

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

46. How are GMAW guns rated?

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

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

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

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