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






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






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






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






5. Give a brief description of the GMAW process






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






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






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






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






10. Regulators control_____________ flowmeters SHOW____________.






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






12. In the GMAW process what does amperage control?






13. What 2 organizations designate specifications for GMAW wires?






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






15. What happens when the electrode extension is increased?






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






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






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






19. List several industries that would use GMAW






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






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






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






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






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






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






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






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






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






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






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






31. What does the abbreviation NEMA stand for?






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






33. What does the term GMAW identify?






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






35. What does voltage do in an electrical circuit?






36. List the three methods of metal transfer with GMAW






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






38. Give a description of 'pinch effect'






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






40. What does inductance control?






41. In the GMAW process what does voltage control?






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






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






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






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






46. List the basic equipment requirements for the GMAW process






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






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






49. What is the effect of too much slope?






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