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Gas Metal Arc Welding

Subject : engineering
  • Answer 50 questions in 15 minutes.
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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 a typical flow rate of CO2 for short circuit transfer?

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

3. List several industries that would use GMAW

4. List the basic equipment requirements for the GMAW process

5. What does inductance control?

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

7. Give a description of 'pinch effect'

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

9. What is the effect of too much slope?

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

11. List the three methods of metal transfer with GMAW

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

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

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

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

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

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

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

19. What controls amperage when using GMAW?

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

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

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

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

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

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

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

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

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

29. In the GMAW process what does voltage control?

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

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

32. In the GMAW process what does amperage control?

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

34. What happens when the electrode extension is increased?

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

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

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

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

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

40. Regulators control_____________ flowmeters SHOW____________.

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

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

43. What 2 organizations designate specifications for GMAW wires?

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

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

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

47. How are GMAW guns rated?

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

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

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