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






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






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






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






5. What is the effect of too much slope?






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






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






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






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






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






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






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






13. What does the abbreviation NEMA stand for?






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






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






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






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






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






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






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






21. Give a description of 'pinch effect'






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






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






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






25. How are GMAW guns rated?






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






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






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






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






30. List the basic equipment requirements for the GMAW process






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






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






33. Give a brief description of the GMAW process






34. In the GMAW process what does amperage control?






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






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






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






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






39. What does the wire feeder control?






40. What does inductance control?






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






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






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






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






45. Regulators control_____________ flowmeters SHOW____________.






46. What controls amperage when using GMAW?






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






48. Why is globular transfer generally avoided with GMAW?






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






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