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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. List several industries that would use GMAW






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






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






4. What does the term GMAW identify?






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






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






7. What 2 organizations designate specifications for GMAW wires?






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






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






10. List the three methods of metal transfer with GMAW






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






12. What controls amperage when using GMAW?






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






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






15. What does voltage do in an electrical circuit?






16. In the GMAW process what does amperage control?






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






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






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






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






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






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






23. What does the abbreviation NEMA stand for?






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






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






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






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






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






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






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






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






32. What does the wire feeder control?






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






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






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






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






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






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






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






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






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






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






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






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






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






46. Give a description of 'pinch effect'






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






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






49. What does inductance control?






50. Give a brief description of the GMAW process






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