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 does the abbreviation NEMA stand for?






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






3. What does voltage do in an electrical circuit?






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






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






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






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






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






9. In the GMAW process what does voltage control?






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






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






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






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






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






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






16. What controls amperage when using GMAW?






17. List the basic equipment requirements for the GMAW process






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






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






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






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






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






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






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






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. Why is a line heater required when using GMAW?






28. Give a brief description of the GMAW process






29. How are GMAW guns rated?






30. What happens when the electrode extension is increased?






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






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






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






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






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






36. What is the effect of too much slope?






37. In the GMAW process what does amperage control?






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






39. Why is globular transfer generally avoided with GMAW?






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






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






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






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






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






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






46. Give a description of 'pinch effect'






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






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






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






50. List the three methods of metal transfer with GMAW