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. List 3 forms compressed gases may be supplied for welding

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

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

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

5. What 2 organizations designate specifications for GMAW wires?

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

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

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

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

10. What does the abbreviation NEMA stand for?

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

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

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

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

15. List the basic equipment requirements for the GMAW process

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

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

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

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

20. How are GMAW guns rated?

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

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

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

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

25. What controls amperage when using GMAW?

26. What does inductance control?

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

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

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

30. List several industries that would use GMAW

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

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

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

34. Give a description of 'pinch effect'

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

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

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

38. What is the effect of too much slope?

39. What does the term GMAW identify?

40. In the GMAW process what does voltage control?

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

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

43. In the GMAW process what does amperage control?

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

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

46. What does the wire feeder control?

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

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

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

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