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Gas Metal Arc Welding

Subject : engineering
Instructions:
  • Answer 50 questions in 30 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 3 wire drive systems and give a short description of each






2. What does the abbreviation NEMA stand for?






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






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






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






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






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






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






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






10. In the GMAW process what does voltage control?






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






12. What does voltage do in an electrical circuit?






13. Why is globular transfer generally avoided with GMAW?






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






15. List the basic equipment requirements for the GMAW process






16. In the GMAW process what does amperage control?






17. What 2 organizations designate specifications for GMAW wires?






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






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






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






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






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






23. What does the wire feeder control?






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






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






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






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






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






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






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






31. List several industries that would use GMAW






32. Give a brief description of the GMAW process






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






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






35. What controls amperage when using GMAW?






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






37. What happens when the electrode extension is increased?






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






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






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






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






42. What does inductance control?






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






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






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






46. What does the term GMAW identify?






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






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






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






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






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