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 a solenoid valve and what actuates it?






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






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






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






5. List the basic equipment requirements for the GMAW process






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






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






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






9. What controls amperage when using GMAW?






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






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






12. In the GMAW process what does amperage control?






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






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






15. Regulators control_____________ flowmeters SHOW____________.






16. Why is globular transfer generally avoided with GMAW?






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






18. What does voltage do in an electrical circuit?






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






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






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






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






23. What does the term GMAW identify?






24. List the three methods of metal transfer with GMAW






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






26. How are GMAW guns rated?






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






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






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






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






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






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






33. Give a brief description of the GMAW process






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






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






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






37. In the GMAW process what does voltage control?






38. What does the wire feeder control?






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






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






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






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






43. List several industries that would use GMAW






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






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






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






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






48. Give a description of 'pinch effect'






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






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