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 purpose of the shielding gas used in GMAW?






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






3. What does voltage do in an electrical circuit?






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






5. Give a description of 'pinch effect'






6. List several industries that would use GMAW






7. What does the abbreviation NEMA stand for?






8. Regulators control_____________ flowmeters SHOW____________.






9. What does the term GMAW identify?






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






11. What controls amperage when using GMAW?






12. Give a brief description of the GMAW process






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






14. What does inductance control?






15. What 2 organizations designate specifications for GMAW wires?






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






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






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






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






20. List the three methods of metal transfer with GMAW






21. What does the wire feeder control?






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






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






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






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






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






27. What is the effect of too much slope?






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






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






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






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






32. How are GMAW guns rated?






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






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






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






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






37. List the basic equipment requirements for the GMAW process






38. What happens when the electrode extension is increased?






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






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






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






42. In the GMAW process what does amperage control?






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






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






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






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






47. Why is globular transfer generally avoided with GMAW?






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






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






50. In the GMAW process what does voltage control?