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. List the basic equipment requirements for the GMAW process






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






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






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






5. What does the abbreviation NEMA stand for?






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






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






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






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






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






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






12. Give a brief description of the GMAW process






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






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






15. What 2 organizations designate specifications for GMAW wires?






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






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






18. Regulators control_____________ flowmeters SHOW____________.






19. List several industries that would use GMAW






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






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






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






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






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






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






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






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






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






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






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






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






32. In the GMAW process what does amperage control?






33. What happens when the electrode extension is increased?






34. What does the wire feeder control?






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






36. What does voltage do in an electrical circuit?






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






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






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






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






41. How are GMAW guns rated?






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






43. In the GMAW process what does voltage control?






44. Give a description of 'pinch effect'






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






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






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






48. What is the effect of too much slope?






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






50. Why is globular transfer generally avoided with GMAW?