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 is the key advantage of short circuiting transfer?






2. List several industries that would use GMAW






3. What does the abbreviation NEMA stand for?






4. In the GMAW process what does voltage control?






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






6. In the GMAW process what does amperage control?






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






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






9. What does the term GMAW identify?






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






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






12. Why is globular transfer generally avoided with GMAW?






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






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






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






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






17. List the basic equipment requirements for the GMAW process






18. What does inductance control?






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






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






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






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






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






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






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






26. What does voltage do in an electrical circuit?






27. What controls amperage when using GMAW?






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






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






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






31. Regulators control_____________ flowmeters SHOW____________.






32. List the three methods of metal transfer with GMAW






33. Give a description of 'pinch effect'






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






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






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






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






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






39. What is the effect of too much slope?






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






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






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






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






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






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






46. What 2 organizations designate specifications for GMAW wires?






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






48. Give a brief description of the GMAW process






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






50. How are GMAW guns rated?