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

2. How are GMAW guns rated?

3. Why is globular transfer generally avoided with GMAW?

4. List the basic equipment requirements for the GMAW process

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

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

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

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

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

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

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

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

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

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

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

16. What does the wire feeder control?

17. What 2 organizations designate specifications for GMAW wires?

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

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

20. What happens when the electrode extension is increased?

21. In the GMAW process what does amperage control?

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

23. What does inductance control?

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

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

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

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

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

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

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 preferred drive roll design for solid wires?

33. In the GMAW process what does voltage control?

34. Give a brief description of the GMAW process

35. What does the abbreviation NEMA stand for?

36. Give a description of 'pinch effect'

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

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

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

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

41. What is the effect of too much slope?

42. What controls amperage when using GMAW?

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

44. What does the term GMAW identify?

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

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

47. List several industries that would use GMAW

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

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

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