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






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






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






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






6. Give a brief description of the GMAW process






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






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






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






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






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






12. In the GMAW process what does amperage control?






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






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






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






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






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






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






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






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






21. What is the reason glass 'tube' type flowmeters must have the tube mounted truly vertical?






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






23. Give a description of 'pinch effect'






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






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






26. List the three methods of metal transfer with GMAW






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






28. What does voltage do in an electrical circuit?






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






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






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






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






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






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






35. In the GMAW process what does voltage control?






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






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






38. What does inductance control?






39. List the basic equipment requirements for the GMAW process






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






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






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






43. What is the effect of too much slope?






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






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






46. Why is globular transfer generally avoided with GMAW?






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






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






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






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