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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 is the preferred drive roll design for solid wires?

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

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

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

5. What does the term GMAW identify?

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

7. What does the wire feeder control?

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

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

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

11. List the three methods of metal transfer with GMAW

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

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

14. Give a brief description of the GMAW process

15. What does voltage do in an electrical circuit?

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

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

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

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

20. List several industries that would use GMAW

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

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

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

24. In the GMAW process what does amperage control?

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

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

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

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

29. In the GMAW process what does voltage control?

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

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

32. What does inductance control?

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

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

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

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

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

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

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

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

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

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

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

44. What happens when the electrode extension is increased?

45. Give a description of 'pinch effect'

46. What does the abbreviation NEMA stand for?

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

48. What 2 organizations designate specifications for GMAW wires?

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

50. Regulators control_____________ flowmeters SHOW____________.