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 is the key advantage of short circuiting transfer?






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






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






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






5. In the GMAW process what does voltage control?






6. What does the term GMAW identify?






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






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






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






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






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






12. What does the abbreviation NEMA stand for?






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






14. In the GMAW process what does amperage control?






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






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






17. Why is globular transfer generally avoided with GMAW?






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






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






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






21. List the basic equipment requirements for the GMAW process






22. List the three methods of metal transfer with GMAW






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






24. What happens when the electrode extension is increased?






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






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






27. How are GMAW guns rated?






28. What 2 organizations designate specifications for GMAW wires?






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






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






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






32. What does the wire feeder control?






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






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






35. Give a brief description of the GMAW process






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






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






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






39. Give a description of 'pinch effect'






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






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






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






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






44. Regulators control_____________ flowmeters SHOW____________.






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






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






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






48. What controls amperage when using GMAW?






49. What is the effect of too much slope?






50. List several industries that would use GMAW