Test your basic knowledge |

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 the factors that determine the mode of metal transfer

2. How are GMAW guns rated?

3. What does inductance control?

4. What does the term GMAW identify?

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

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

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

8. What 2 organizations designate specifications for GMAW wires?

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

10. What does voltage do in an electrical circuit?

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

12. What does the abbreviation NEMA stand for?

13. Regulators control_____________ flowmeters SHOW____________.

14. What controls amperage when using GMAW?

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

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

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

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

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

20. In the GMAW process what does voltage control?

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

22. List several industries that would use GMAW

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

24. Give a brief description of the GMAW process

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

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

27. List the basic equipment requirements for the GMAW process

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

29. List the three methods of metal transfer with GMAW

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

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

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

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

34. Give a description of 'pinch effect'

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

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

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

38. What happens when the electrode extension is increased?

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

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

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

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

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

44. In the GMAW process what does amperage control?

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

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

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

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

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

50. What does the wire feeder control?