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 purpose of the pick- up lead on a voltage sensing wire feeder?






2. What does inductance control?






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






4. What does the wire feeder control?






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






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






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






8. How are GMAW guns rated?






9. In the GMAW process what does voltage control?






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






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






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






13. Why is globular transfer generally avoided with GMAW?






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






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






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






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






18. What controls amperage when using GMAW?






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






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






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






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






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






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






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






26. Give a description of 'pinch effect'






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






28. What is the effect of too much slope?






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






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






31. Regulators control_____________ flowmeters SHOW____________.






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






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






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






35. What does the term GMAW identify?






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






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






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






39. What does voltage do in an electrical circuit?






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






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






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






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






44. List several industries that would use GMAW






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






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






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






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






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






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