Test your basic knowledge |

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. When is the metal transferred with short circuit transfer?

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

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

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

5. Why is globular transfer generally avoided with GMAW?

6. What does inductance control?

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

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

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

10. How are GMAW guns rated?

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

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

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

14. Give a brief description of the GMAW process

15. What does voltage do in an electrical circuit?

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

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

18. Regulators control_____________ flowmeters SHOW____________.

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

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

21. What does the term GMAW identify?

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

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

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

25. In the GMAW process what does amperage control?

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

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

28. What happens when the electrode extension is increased?

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

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

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

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

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

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

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

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

37. What 2 organizations designate specifications for GMAW wires?

38. In the GMAW process what does voltage control?

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

40. What does the abbreviation NEMA stand for?

41. List several industries that would use GMAW

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

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

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

45. What does the wire feeder control?

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

47. What is the effect of too much slope?

48. List the basic equipment requirements for the GMAW process

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

50. What controls amperage when using GMAW?