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. In the GMAW process what does voltage control?

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

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

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

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

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

7. What does the term GMAW identify?

8. What does inductance control?

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

10. What does voltage do in an electrical circuit?

11. How are GMAW guns rated?

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

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

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

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

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

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

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

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

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

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

22. What is the effect of too much slope?

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

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

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

26. List the basic equipment requirements for the GMAW process

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

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

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

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

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

32. What does the wire feeder control?

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

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

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

36. Give a description of 'pinch effect'

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

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

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

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

41. What 2 organizations designate specifications for GMAW wires?

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

43. List several industries that would use GMAW

44. In the GMAW process what does amperage control?

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

46. What controls amperage when using GMAW?

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

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

49. Why is globular transfer generally avoided with GMAW?

50. Regulators control_____________ flowmeters SHOW____________.