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






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






3. List the three methods of metal transfer with GMAW






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






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






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






7. In the GMAW process what does voltage control?






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






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






10. Give a description of 'pinch effect'






11. Regulators control_____________ flowmeters SHOW____________.






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






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






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






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






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






17. List several industries that would use GMAW






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






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






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






21. Why is globular transfer generally avoided with GMAW?






22. What does the abbreviation NEMA stand for?






23. What does voltage do in an electrical circuit?






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






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






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






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






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






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






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






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






32. In the GMAW process what does amperage control?






33. What does inductance control?






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






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






36. How are GMAW guns rated?






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






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






39. Give a brief description of the GMAW process






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






41. What does the wire feeder control?






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






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






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






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






46. List the basic equipment requirements for the GMAW process






47. What controls amperage when using GMAW?






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






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






50. What happens when the electrode extension is increased?