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. Give a description of 'pinch effect'






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






3. What 2 organizations designate specifications for GMAW wires?






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






5. What happens when the electrode extension is increased?






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






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






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






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






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






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






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






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






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






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






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






17. List the three methods of metal transfer with GMAW






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






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






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






21. What is the effect of too much slope?






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






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






24. What does the term GMAW identify?






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






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






27. List several industries that would use GMAW






28. In the GMAW process what does amperage control?






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






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






31. Regulators control_____________ flowmeters SHOW____________.






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






33. In the GMAW process what does voltage control?






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






35. How are GMAW guns rated?






36. List the basic equipment requirements for the GMAW process






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






38. Give a brief description of the GMAW process






39. What does the wire feeder control?






40. What does inductance control?






41. What controls amperage when using GMAW?






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






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






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






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






46. What does the abbreviation NEMA stand for?






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






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






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






50. What does voltage do in an electrical circuit?