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






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






4. Regulators control_____________ flowmeters SHOW____________.






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






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






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






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






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






10. What does inductance control?






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






12. What is the effect of too much slope?






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






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






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






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






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






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






19. List the basic equipment requirements for the GMAW process






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






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






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






23. In the GMAW process what does amperage control?






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






25. What does the term GMAW identify?






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






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






28. List the three methods of metal transfer with GMAW






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






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






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






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






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






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






35. What happens when the electrode extension is increased?






36. What does voltage do in an electrical circuit?






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






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






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






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






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






42. How are GMAW guns rated?






43. What 2 organizations designate specifications for GMAW wires?






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






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






46. Give a description of 'pinch effect'






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






48. What does the wire feeder control?






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






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