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 disadvantage of the gauge preset type of regulator/flowmeter?






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






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






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






5. In the GMAW process what does amperage control?






6. Give a brief description of the GMAW process






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






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






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






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






11. List the basic equipment requirements for the GMAW process






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






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






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






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






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






17. What does the wire feeder control?






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






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






20. What happens when the electrode extension is increased?






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






22. Regulators control_____________ flowmeters SHOW____________.






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






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






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






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






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






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






29. List the three methods of metal transfer with GMAW






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






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






32. What is the effect of too much slope?






33. What does inductance control?






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






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






36. List several industries that would use GMAW






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






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






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






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






41. Give a description of 'pinch effect'






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






43. What does the abbreviation NEMA stand for?






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






45. Why is globular transfer generally avoided with GMAW?






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






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






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






49. How are GMAW guns rated?






50. What 2 organizations designate specifications for GMAW wires?