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






2. What happens when the electrode extension is increased?






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






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






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






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






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






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






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






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






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






12. In the GMAW process what does voltage control?






13. What does the term GMAW identify?






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






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






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






17. List several industries that would use GMAW






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






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






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






21. What 2 organizations designate specifications for GMAW wires?






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






23. Why is globular transfer generally avoided with GMAW?






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






25. What does voltage do in an electrical circuit?






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






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






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






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






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






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






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






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






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






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






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






37. Give a brief description of the GMAW process






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






39. What does inductance control?






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






41. Give a description of 'pinch effect'






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






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






44. What does the abbreviation NEMA stand for?






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






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






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






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






49. How are GMAW guns rated?






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






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