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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. In the GMAW process what does voltage control?






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






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






4. What does inductance control?






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






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






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






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






9. What does the term GMAW identify?






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






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






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






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






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






15. What controls amperage when using GMAW?






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






17. Why is globular transfer generally avoided with GMAW?






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






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






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






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






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






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






24. List the basic equipment requirements for the GMAW process






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






26. What 2 organizations designate specifications for GMAW wires?






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






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






29. What does voltage do in an electrical circuit?






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






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






32. Regulators control_____________ flowmeters SHOW____________.






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






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






35. What does the wire feeder control?






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






37. What happens when the electrode extension is increased?






38. List the three methods of metal transfer with GMAW






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






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






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






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






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






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






45. Give a description of 'pinch effect'






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






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






48. What does the abbreviation NEMA stand for?






49. In the GMAW process what does amperage control?






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






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