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 a typical flow rate of CO2 for short circuit transfer?






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






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






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






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






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






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






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






9. List the three methods of metal transfer with GMAW






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






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






12. What 2 organizations designate specifications for GMAW wires?






13. In the GMAW process what does amperage control?






14. What controls amperage when using GMAW?






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






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






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






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






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






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






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






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






23. Why is globular transfer generally avoided with GMAW?






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






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






26. Regulators control_____________ flowmeters SHOW____________.






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






28. Give a brief description of the GMAW process






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






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






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






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






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






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






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






36. What does the abbreviation NEMA stand for?






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






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






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






40. In the GMAW process what does voltage control?






41. List several industries that would use GMAW






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






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






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






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






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






47. What does the wire feeder control?






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






49. What is the effect of too much slope?






50. What does the term GMAW identify?