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. List the basic equipment requirements for the GMAW process






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






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






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






5. What does the abbreviation NEMA stand for?






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






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






8. What is the effect of too much slope?






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






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






11. Give a brief description of the GMAW process






12. Why is globular transfer generally avoided with GMAW?






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






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






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






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






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






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






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






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






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






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






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






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






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






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






27. What 2 organizations designate specifications for GMAW wires?






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






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






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






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






32. Regulators control_____________ flowmeters SHOW____________.






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






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






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






36. What does the wire feeder control?






37. In the GMAW process what does amperage control?






38. What does the term GMAW identify?






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






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






41. What controls amperage when using GMAW?






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






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






44. What does inductance control?






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






46. List several industries that would use GMAW






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






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






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






50. Give a description of 'pinch effect'