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. Why is globular transfer generally avoided with GMAW?






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






3. List several industries that would use GMAW






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






5. In the GMAW process what does voltage control?






6. Give a description of 'pinch effect'






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






8. What does the term GMAW identify?






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






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






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






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






13. What controls amperage when using GMAW?






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






15. What does voltage do in an electrical circuit?






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






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






18. Give a brief description of the GMAW process






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






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






21. What 2 organizations designate specifications for GMAW wires?






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






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






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






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






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






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






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






29. What does inductance control?






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






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






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






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






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






35. How are GMAW guns rated?






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






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






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






39. List the basic equipment requirements for the GMAW process






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






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






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






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






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






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






46. What happens when the electrode extension is increased?






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






48. What does the abbreviation NEMA stand for?






49. In the GMAW process what does amperage control?






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