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

2. Give a description of 'pinch effect'

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

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

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

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

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

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

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

10. What does the term GMAW identify?

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

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

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

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

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

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

17. List the basic equipment requirements for the GMAW process

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

19. How are GMAW guns rated?

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

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

22. What controls amperage when using GMAW?

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

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

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

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

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

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

29. List the three methods of metal transfer with GMAW

30. What does voltage do in an electrical circuit?

31. What does inductance control?

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

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

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

35. What 2 organizations designate specifications for GMAW wires?

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

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

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

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

40. In the GMAW process what does voltage control?

41. What is the effect of too much slope?

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

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

44. In the GMAW process what does amperage control?

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

46. What happens when the electrode extension is increased?

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

48. Why is globular transfer generally avoided with GMAW?

49. What does the abbreviation NEMA stand for?

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