Test your basic knowledge |

Gas Metal Arc Welding

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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






2. What happens when the electrode extension is increased?






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






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






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






6. What controls amperage when using GMAW?






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






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






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






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






11. Why is globular transfer generally avoided with GMAW?






12. List the three methods of metal transfer with GMAW






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






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






15. What is the effect of too much slope?






16. List the basic equipment requirements for the GMAW process






17. In the GMAW process what does amperage control?






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






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






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






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






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






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






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






25. In the GMAW process what does voltage control?






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






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






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






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






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






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






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






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






34. What does inductance control?






35. List several industries that would use GMAW






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






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






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






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






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






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






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






43. What does the wire feeder control?






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






45. Give a brief description of the GMAW process






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






47. What does the term GMAW identify?






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






49. Give a description of 'pinch effect'






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