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 purpose of a regulator and what does it indicate on its gauges?






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






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






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






5. List several industries that would use GMAW






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






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






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






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






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






11. What does the wire feeder control?






12. What controls amperage when using GMAW?






13. How are GMAW guns rated?






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






15. What does the term GMAW identify?






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






17. Give a description of 'pinch effect'






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






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






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






21. What happens when the electrode extension is increased?






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






23. List the basic equipment requirements for the GMAW process






24. Why is globular transfer generally avoided with GMAW?






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






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






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






28. Regulators control_____________ flowmeters SHOW____________.






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






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






31. In the GMAW process what does voltage control?






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






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






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






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






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






37. List the three methods of metal transfer with GMAW






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






39. In the GMAW process what does amperage control?






40. What does voltage do in an electrical circuit?






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






42. What 2 organizations designate specifications for GMAW wires?






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






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






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






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






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






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






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






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