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






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






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






4. What does inductance control?






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






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






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






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






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






10. In the GMAW process what does voltage control?






11. How are GMAW guns rated?






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






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






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






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






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






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






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






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






20. What happens when the electrode extension is increased?






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






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






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






24. List several industries that would use GMAW






25. What does voltage do in an electrical circuit?






26. What does the wire feeder control?






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






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






29. What 2 organizations designate specifications for GMAW wires?






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






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






32. What does the term GMAW identify?






33. What does the abbreviation NEMA stand for?






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






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






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






37. List the basic equipment requirements for the GMAW process






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






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






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






41. Give a description of 'pinch effect'






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






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






44. In the GMAW process what does amperage control?






45. Why is globular transfer generally avoided with GMAW?






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






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






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






49. List the three methods of metal transfer with GMAW






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






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