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 recommended electrode stick- out for .035 solid wire?






2. List the three methods of metal transfer with GMAW






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






4. List the basic equipment requirements for the GMAW process






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






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






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






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






9. In the GMAW process what does amperage control?






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






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






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






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






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






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






16. What happens when the electrode extension is increased?






17. Give a description of 'pinch effect'






18. What 2 organizations designate specifications for GMAW wires?






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






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






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






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






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






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






25. What does voltage do in an electrical circuit?






26. How are GMAW guns rated?






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






28. What does the abbreviation NEMA stand for?






29. Why is globular transfer generally avoided with GMAW?






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






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






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






33. What does the wire feeder control?






34. What is the effect of too much slope?






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






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






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






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






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






40. What controls amperage when using GMAW?






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






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






43. Give a brief description of the GMAW process






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






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






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






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






48. What does the term GMAW identify?






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






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