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. List the basic equipment requirements for the GMAW process






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






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






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






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






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






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






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






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






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






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






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






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






15. What 2 organizations designate specifications for GMAW wires?






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






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






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






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






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






21. Give a brief description of the GMAW process






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






23. What is the reason glass 'tube' type flowmeters must have the tube mounted truly vertical?






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






25. Regulators control_____________ flowmeters SHOW____________.






26. What does the wire feeder control?






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






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






29. List several industries that would use GMAW






30. What does the term GMAW identify?






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






32. What does voltage do in an electrical circuit?






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






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






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






36. List the three methods of metal transfer with GMAW






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






38. How are GMAW guns rated?






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






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






41. What does inductance control?






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






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






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






45. What controls amperage when using GMAW?






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






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






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






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






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