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 2 controls are found on a GMAW set- up?






2. List the basic equipment requirements for the GMAW process






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






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






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






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






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






8. What 2 organizations designate specifications for GMAW wires?






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






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






11. List the three methods of metal transfer with GMAW






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






13. What does the abbreviation NEMA stand for?






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






15. What controls amperage when using GMAW?






16. Regulators control_____________ flowmeters SHOW____________.






17. What is the effect of too much slope?






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






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






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






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






22. How are GMAW guns rated?






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






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






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






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






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






28. What does the term GMAW identify?






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






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






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






32. Why is globular transfer generally avoided with GMAW?






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






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






35. What does inductance control?






36. What does the wire feeder control?






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






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






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






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






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






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






43. Give a description of 'pinch effect'






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






45. What happens when the electrode extension is increased?






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






47. In the GMAW process what does amperage control?






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






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






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