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. In the GMAW process what does amperage control?






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






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






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






5. In the GMAW process what does voltage control?






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






7. Give a brief description of the GMAW process






8. How are GMAW guns rated?






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






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






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






12. What controls amperage when using GMAW?






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






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






15. What 2 organizations designate specifications for GMAW wires?






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






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






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






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






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






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






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






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






24. List the three methods of metal transfer with GMAW






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






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






27. List the basic equipment requirements for the GMAW process






28. Why is globular transfer generally avoided with GMAW?






29. What does the abbreviation NEMA stand for?






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






31. Give a description of 'pinch effect'






32. What does inductance control?






33. When using flat drive rolls with too much pressure on copper coated solid wires what problem could take place?






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






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






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






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






38. What happens when the electrode extension is increased?






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






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






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






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






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






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






45. List several industries that would use GMAW






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






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






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






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






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