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 does a flowmeter do and what does it measure?






2. List several industries that would use GMAW






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






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






5. What does voltage do in an electrical circuit?






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






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






8. Why is globular transfer generally avoided with GMAW?






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






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






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






12. List the basic equipment requirements for the GMAW process






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






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






15. What is the effect of too much slope?






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






17. What does the abbreviation NEMA stand for?






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






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






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






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






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






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






24. What 2 organizations designate specifications for GMAW wires?






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






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






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






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






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






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






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






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






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






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






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






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






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






38. In the GMAW process what does voltage control?






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






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






41. What does inductance control?






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






43. List the three methods of metal transfer with GMAW






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






45. Give a description of 'pinch effect'






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






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






48. How are GMAW guns rated?






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






50. In the GMAW process what does amperage control?