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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 an advantage of pulsed arc transfer with GMAW?

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

3. List the three methods of metal transfer with GMAW

4. In the GMAW process what does voltage control?

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

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

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

8. What does the wire feeder control?

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

10. Regulators control_____________ flowmeters SHOW____________.

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

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

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

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

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

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

17. What controls amperage when using GMAW?

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

19. What does the term GMAW identify?

20. Give a description of 'pinch effect'

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

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

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

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

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

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

27. Why is globular transfer generally avoided with GMAW?

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

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

30. How are GMAW guns rated?

31. In the GMAW process what does amperage control?

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

33. What is the effect of too much slope?

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

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

36. What does the abbreviation NEMA stand for?

37. What happens when the electrode extension is increased?

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

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

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

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

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

43. What does inductance control?

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

45. Give a brief description of the GMAW process

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

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

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

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

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