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. Why is globular transfer generally avoided with GMAW?






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






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






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






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






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






7. List the three methods of metal transfer with GMAW






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






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






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






11. Regulators control_____________ flowmeters SHOW____________.






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






13. What does the term GMAW identify?






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






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






16. In the GMAW process what does amperage control?






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






18. List the basic equipment requirements for the GMAW process






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






20. What 2 organizations designate specifications for GMAW wires?






21. What does the wire feeder control?






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






23. What does inductance control?






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






25. What controls amperage when using GMAW?






26. In the GMAW process what does voltage control?






27. How are GMAW guns rated?






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






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






30. Give a brief description of the GMAW process






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






32. What does the abbreviation NEMA stand for?






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






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






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






36. What does voltage do in an electrical circuit?






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






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






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






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






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






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






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






44. Give a description of 'pinch effect'






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






46. What is the effect of too much slope?






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






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






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






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