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






2. Why is globular transfer generally avoided with GMAW?






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






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






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






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






7. What happens when the electrode extension is increased?






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






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






10. What 2 organizations designate specifications for GMAW wires?






11. In the GMAW process what does voltage control?






12. What is the effect of too much slope?






13. What does voltage do in an electrical circuit?






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






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






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






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






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






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






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






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






22. In the GMAW process what does amperage control?






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






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






25. List several industries that would use GMAW






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






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






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






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






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






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






32. How are GMAW guns rated?






33. Give a description of 'pinch effect'






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






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






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






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






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






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






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






41. What does the wire feeder control?






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






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






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






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






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






47. What does inductance control?






48. What does the term GMAW identify?






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






50. List the basic equipment requirements for the GMAW process