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 is the term GMAW preferred over MIG or MAG?






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






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






4. In the GMAW process what does amperage control?






5. What does the term GMAW identify?






6. What happens when the electrode extension is increased?






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






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






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






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






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






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






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






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






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






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






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






18. In the GMAW process what does voltage control?






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






20. What does the abbreviation NEMA stand for?






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






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






23. Why is globular transfer generally avoided with GMAW?






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






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






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






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






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






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






30. What does voltage do in an electrical circuit?






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






32. List the basic equipment requirements for the GMAW process






33. List the three methods of metal transfer with GMAW






34. How are GMAW guns rated?






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






36. What controls amperage when using GMAW?






37. List several industries that would use GMAW






38. What does the wire feeder control?






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






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






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






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






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






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






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






46. What 2 organizations designate specifications for GMAW wires?






47. What is the effect of too much slope?






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






49. Give a brief description of the GMAW process






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