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

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

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

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

5. What happens when the electrode extension is increased?

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

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

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

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

10. List the basic equipment requirements for the GMAW process

11. What does the wire feeder control?

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

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

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

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

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

17. Why is globular transfer generally avoided with GMAW?

18. What controls amperage when using GMAW?

19. Give a brief description of the GMAW process

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

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

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

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

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

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

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

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

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

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

30. Regulators control_____________ flowmeters SHOW____________.

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

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

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

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

35. In the GMAW process what does voltage control?

36. List several industries that would use GMAW

37. List the three methods of metal transfer with GMAW

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

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

40. Give a description of 'pinch effect'

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

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

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

44. What does the term GMAW identify?

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

46. What does inductance control?

47. What does the abbreviation NEMA stand for?

48. What is the effect of too much slope?

49. What does voltage do in an electrical circuit?

50. How are GMAW guns rated?