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






2. What is the effect of too much slope?






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






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






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






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






7. What does the abbreviation NEMA stand for?






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






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






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






11. In the GMAW process what does amperage control?






12. What does voltage do in an electrical circuit?






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






14. How are GMAW guns rated?






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






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






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






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






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






20. List the three methods of metal transfer with GMAW






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






22. In the GMAW process what does voltage control?






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






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






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






26. Give a description of 'pinch effect'






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






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






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






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






31. Why is globular transfer generally avoided with GMAW?






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






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






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






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






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






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






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






39. What controls amperage when using GMAW?






40. What does the term GMAW identify?






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






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






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






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






45. List the basic equipment requirements for the GMAW process






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






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






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






49. What are the 2 types of wire feeders available?






50. Give a brief description of the GMAW process