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 recommended electrode stick- out for .035 solid wire?

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

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

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

5. List the three methods of metal transfer with GMAW

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

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

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

9. What does the abbreviation NEMA stand for?

10. What does voltage do in an electrical circuit?

11. What controls amperage when using GMAW?

12. Regulators control_____________ flowmeters SHOW____________.

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

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

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

16. How are GMAW guns rated?

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

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

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

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

21. List several industries that would use GMAW

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

23. In the GMAW process what does amperage control?

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

25. Why is globular transfer generally avoided with GMAW?

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

27. Give a brief description of the GMAW process

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

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

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

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

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

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

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

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

36. What does the wire feeder control?

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

38. What does the term GMAW identify?

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

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

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

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

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

44. What is the effect of too much slope?

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

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

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

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

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

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