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






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






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






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






5. How are GMAW guns rated?






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






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






8. What does voltage do in an electrical circuit?






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






10. What controls amperage when using GMAW?






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






12. What does inductance control?






13. What does the term GMAW identify?






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






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






16. Give a description of 'pinch effect'






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






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






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






20. What is the effect of too much slope?






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






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






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






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






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






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






27. What does the wire feeder control?






28. Regulators control_____________ flowmeters SHOW____________.






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






30. Give a brief description of the GMAW process






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






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






33. List the three methods of metal transfer with GMAW






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






35. What 2 organizations designate specifications for GMAW wires?






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






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






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






39. List several industries that would use GMAW






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






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






42. In the GMAW process what does voltage control?






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






44. Why is globular transfer generally avoided with GMAW?






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






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






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






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






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






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







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