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






2. What happens when the electrode extension is increased?






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






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






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






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






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






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






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






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






11. What controls amperage when using GMAW?






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






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






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






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






16. List several industries that would use GMAW






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






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






19. Regulators control_____________ flowmeters SHOW____________.






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






21. How are GMAW guns rated?






22. What does the abbreviation NEMA stand for?






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






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






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






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






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






28. Give a brief description of the GMAW process






29. What does the wire feeder control?






30. What does inductance control?






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






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






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






34. What 2 organizations designate specifications for GMAW wires?






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






36. What is the effect of too much slope?






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






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






39. Why is globular transfer generally avoided with GMAW?






40. What does the term GMAW identify?






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






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






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






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






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






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






47. What does voltage do in an electrical circuit?






48. Give a description of 'pinch effect'






49. List the basic equipment requirements for the GMAW process






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