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






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






3. What does the abbreviation NEMA stand for?






4. Give a brief description of the GMAW process






5. Give a description of 'pinch effect'






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






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






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






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






10. List several industries that would use GMAW






11. What happens when the electrode extension is increased?






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






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






14. List the basic equipment requirements for the GMAW process






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






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






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






18. What is the effect of too much slope?






19. What controls amperage when using GMAW?






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






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






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






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






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






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






26. What does voltage do in an electrical circuit?






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






28. In the GMAW process what does amperage control?






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






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






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






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






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






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






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






36. In the GMAW process what does voltage control?






37. What 2 organizations designate specifications for GMAW wires?






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






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






40. Regulators control_____________ flowmeters SHOW____________.






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






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






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






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






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






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






47. List the three methods of metal transfer with GMAW






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






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






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