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. What is the effect of too much slope?

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

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

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

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

6. Give a description of 'pinch effect'

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

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

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

10. List the basic equipment requirements for the GMAW process

11. What does inductance control?

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

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

14. What does the wire feeder control?

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

16. What does voltage do in an electrical circuit?

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

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

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

20. List several industries that would use GMAW

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

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

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

24. In the GMAW process what does voltage control?

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

26. What happens when the electrode extension is increased?

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

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

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

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

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

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

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

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

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

36. Regulators control_____________ flowmeters SHOW____________.

37. What 2 organizations designate specifications for GMAW wires?

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

39. What does the term GMAW identify?

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

41. What does the abbreviation NEMA stand for?

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

43. How are GMAW guns rated?

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

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

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

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

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

49. List the three methods of metal transfer with GMAW

50. Give a brief description of the GMAW process