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






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






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






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






5. What controls amperage when using GMAW?






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






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






8. What does the abbreviation NEMA stand for?






9. What does the term GMAW identify?






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






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






12. List the three methods of metal transfer with GMAW






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






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






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






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






17. What does voltage do in an electrical circuit?






18. What does inductance control?






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






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






21. List the basic equipment requirements for the GMAW process






22. Give a brief description of the GMAW process






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






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






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






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






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






28. In the GMAW process what does voltage control?






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






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






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






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






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






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






35. Regulators control_____________ flowmeters SHOW____________.






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






37. What does the wire feeder control?






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






39. Give a description of 'pinch effect'






40. Why is globular transfer generally avoided with GMAW?






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






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






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






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






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






46. What happens when the electrode extension is increased?






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






48. How are GMAW guns rated?






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






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







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