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. Regulators control_____________ flowmeters SHOW____________.

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

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

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

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

6. What 2 organizations designate specifications for GMAW wires?

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

8. What does inductance control?

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

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

11. Why is globular transfer generally avoided with GMAW?

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

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

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

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

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

17. List several industries that would use GMAW

18. Give a brief description of the GMAW process

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

20. What happens when the electrode extension is increased?

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

22. What does the abbreviation NEMA stand for?

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

24. Give a description of 'pinch effect'

25. What is the effect of too much slope?

26. What controls amperage when using GMAW?

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

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

29. List the basic equipment requirements for the GMAW process

30. In the GMAW process what does voltage control?

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

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

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

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

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

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

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

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

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

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

41. What does the wire feeder control?

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

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

44. How are GMAW guns rated?

45. What does voltage do in an electrical circuit?

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

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

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

49. List the three methods of metal transfer with GMAW

50. What does the term GMAW identify?