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 must CO2 cylinders be used in the vertical position?






2. What does the wire feeder control?






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






4. Regulators control_____________ flowmeters SHOW____________.






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






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






7. What 2 organizations designate specifications for GMAW wires?






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






9. What is the effect of too much slope?






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






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






12. Why is globular transfer generally avoided with GMAW?






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






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






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






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






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






18. Give a brief description of the GMAW process






19. In the GMAW process what does voltage control?






20. List the basic equipment requirements for the GMAW process






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






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






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






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






25. What does voltage do in an electrical circuit?






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






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






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






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






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






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






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






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






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






35. Give a description of 'pinch effect'






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






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






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






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






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






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






42. List the three methods of metal transfer with GMAW






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






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






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






46. What does the term GMAW identify?






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






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






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






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