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. Why is a line heater required when using GMAW?






2. List several industries that would use GMAW






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






4. What does the wire feeder control?






5. Regulators control_____________ flowmeters SHOW____________.






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






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






8. What controls amperage when using GMAW?






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






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






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






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






13. What is a typical flow rate of CO2 for short circuit transfer?






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






15. How are GMAW guns rated?






16. List the basic equipment requirements for the GMAW process






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






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






19. What does the abbreviation NEMA stand for?






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






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






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






23. What happens when the electrode extension is increased?






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






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






26. What does inductance control?






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






28. In the GMAW process what does voltage control?






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






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






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






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






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






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






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






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






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






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






39. What does the term GMAW identify?






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






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






42. Give a description of 'pinch effect'






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






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






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






46. List the three methods of metal transfer with GMAW






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






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






49. What does voltage do in an electrical circuit?






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