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






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






3. What 2 organizations designate specifications for GMAW wires?






4. What does the wire feeder control?






5. Why is globular transfer generally avoided with GMAW?






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






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






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






9. List the basic equipment requirements for the GMAW process






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






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






12. What does the abbreviation NEMA stand for?






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






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






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






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






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






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






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






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






21. In the GMAW process what does amperage control?






22. What happens when the electrode extension is increased?






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






24. Give a brief description of the GMAW process






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






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






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






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






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






30. In the GMAW process what does voltage control?






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






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






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






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






35. What controls amperage when using GMAW?






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






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






38. Regulators control_____________ flowmeters SHOW____________.






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






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






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






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






43. List the three methods of metal transfer with GMAW






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






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






46. What does voltage do in an electrical circuit?






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






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






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






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






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