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






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






3. What does the term GMAW identify?






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






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






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






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






8. What controls amperage when using GMAW?






9. Why is globular transfer generally avoided with GMAW?






10. List the basic equipment requirements for the GMAW process






11. List the three methods of metal transfer with GMAW






12. What does inductance control?






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






14. What 2 organizations designate specifications for GMAW wires?






15. In the GMAW process what does amperage control?






16. What does the abbreviation NEMA stand for?






17. Give a brief description of the GMAW process






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






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






20. Give a description of 'pinch effect'






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






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






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






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






25. What does voltage do in an electrical circuit?






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






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






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






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






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






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






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






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






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






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






36. List several industries that would use GMAW






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






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






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






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






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






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






43. How are GMAW guns rated?






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






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






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






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






48. What happens when the electrode extension is increased?






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






50. Regulators control_____________ flowmeters SHOW____________.