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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 2 organizations designate specifications for GMAW wires?






2. Give a description of 'pinch effect'






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






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






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






6. Give a brief description of the GMAW process






7. Why is globular transfer generally avoided with GMAW?






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






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






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






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






12. What does the abbreviation NEMA stand for?






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






14. List the basic equipment requirements for the GMAW process






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






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






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






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






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






20. What happens when the electrode extension is increased?






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






22. What does voltage do in an electrical circuit?






23. How are GMAW guns rated?






24. What is the effect of too much slope?






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






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






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






28. In the GMAW process what does amperage control?






29. List the three methods of metal transfer with GMAW






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






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






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






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






34. What does inductance control?






35. Regulators control_____________ flowmeters SHOW____________.






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






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






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






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






40. In the GMAW process what does voltage control?






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






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






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






44. List several industries that would use GMAW






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






46. What controls amperage when using GMAW?






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






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






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






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






Can you answer 50 questions in 15 minutes?



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