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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. Give a brief description of the GMAW process






2. Why is globular transfer generally avoided with GMAW?






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






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






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






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






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






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






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






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






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






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






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






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






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






16. In the GMAW process what does amperage control?






17. What does the term GMAW identify?






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






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






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






21. Regulators control_____________ flowmeters SHOW____________.






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






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






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






25. What happens when the electrode extension is increased?






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






27. What does inductance control?






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






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






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






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






32. List several industries that would use GMAW






33. What does the abbreviation NEMA stand for?






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






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






36. What 2 organizations designate specifications for GMAW wires?






37. Give a description of 'pinch effect'






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






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






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






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






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






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






44. In the GMAW process what does voltage control?






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






46. What does the wire feeder control?






47. List the basic equipment requirements for the GMAW process






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






49. List the three methods of metal transfer with GMAW






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






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