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 a regulator and what does it indicate on its gauges?






2. Give a brief description of the GMAW process






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






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






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






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






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






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






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






10. What 2 organizations designate specifications for GMAW wires?






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






12. Why is globular transfer generally avoided with GMAW?






13. List the basic equipment requirements for the GMAW process






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






15. Give a description of 'pinch effect'






16. What does the wire feeder control?






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






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






19. In the GMAW process what does voltage control?






20. List the three methods of metal transfer with GMAW






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






22. In the GMAW process what does amperage control?






23. What happens when the electrode extension is increased?






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






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






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






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






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






29. How are GMAW guns rated?






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






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






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






33. What controls amperage when using GMAW?






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






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






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






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






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






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






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






41. List several industries that would use GMAW






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






43. What is the effect of too much slope?






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






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






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






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






48. What does inductance control?






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






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