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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 another term for electrode holders for GMAW?

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

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

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

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

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

7. Why is globular transfer generally avoided with GMAW?

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

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

10. How are GMAW guns rated?

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

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

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

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

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

16. What does the abbreviation NEMA stand for?

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

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

19. Regulators control_____________ flowmeters SHOW____________.

20. List several industries that would use GMAW

21. In the GMAW process what does voltage control?

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

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

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

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

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

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

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

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

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

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

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

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

34. Give a description of 'pinch effect'

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

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

37. What does the term GMAW identify?

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

39. What 2 organizations designate specifications for GMAW wires?

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

41. What happens when the electrode extension is increased?

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

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

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

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

46. Give a brief description of the GMAW process

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

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

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

50. What does inductance control?