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Gas Metal Arc Welding

Instructions:

Answer 50 questions in 15 minutes.
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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 wire are knurled drive rolls most commonly used on?
Push type: Wire is fed by a set of drive rolls located in the wire feed unit - Pull type: Drive rolls mounted in the gun itself - Push- pull type: Combination of the two
Flux cored wires
20 to 200 times per second
To prevent drawing of liquid CO2 (Carbon Dioxide)

2. A 10 minute cycle of welding time vs cooling time a given machine can handle.
To limit the short circuiting current so that spatter is reduced
Wire feed speed - Voltage control
AWS and CSA
Duty cycle

3. Why is a line heater required when using GMAW?
85%
Dry ice can form within the flow control openings and cause blockage of shielding gas
Gas metal arc welding
Cause flaking - which can clog the liner and contact tube

4. List the three methods of metal transfer with GMAW
Minutes of elapsed time continually run (out of 10 minutes)
The negative side of a welding unit
...
Short- circuiting transfer - Globular transfer - Spray transfer

5. What controls the wire speed on a voltage sensing wire feeder?
Constant- speed wire feeders and Voltage- sennsing wire feeders
The time rate of response for the current rise and fall
By there current carrying capacity
The Arc voltage

6. Why is a fiber washer required and what cylinder gas requires it?
Shielding the molten weld metal from atmospheric contamination
If you dont know this check your phone
Controls the rate of flow of a shielding gas to the gun nozzle
To prevent leakage - Carbon Dioxide (CO2)

7. What is another term for electrode holders for GMAW?
Minutes of elapsed time continually run (out of 10 minutes)
The time rate of response for the current rise and fall
Guns
Wire feed speed

8. Draw a typical volt amp curve for a machine that is designed for GMAW
If you dont know this check your phone
20 to 200 times per second
Wire feed speed
Flux cored wires

9. A pull type drive system is usually used on what type of material?
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Aluminum wire
V groove or U groove
15 feet (4.5 meters)

10. What term is used to describe when the workpiece is hooked to the negative pole on the power source?
...
(DCEP) Direct Current Electrode Positive or Reverse polarity
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
To prevent drawing of liquid CO2 (Carbon Dioxide)

11. What type of power source is used with a constant speed wire feeder?
Constant voltage (CV)
The Arc voltage
Reducing the gas source pressure to a constant working pressure
Flux cored wires

12. What 2 organizations designate specifications for GMAW wires?
If you dont know this check your phone
AWS and CSA
Wire feed speed - Voltage control
Controls the rate of flow of a shielding gas to the gun nozzle

13. What is the key advantage of short circuiting transfer?
Minimum distortion due to low heat input
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
By there current carrying capacity
Pressure vessels and the piping industry

14. What is the disadvantage of the gauge preset type of regulator/flowmeter?
15 feet (4.5 meters)
5.8 to 12.5 L/min
Push type: Wire is fed by a set of drive rolls located in the wire feed unit - Pull type: Drive rolls mounted in the gun itself - Push- pull type: Combination of the two
Generally not as accurate

15. What output on the welding machine is used to rate the duty cycle?
Penetration and burn - off rate of the electrode
Insufficient current to melt the wire off cleanly
Minutes of elapsed time continually run (out of 10 minutes)
These terms are quite restrictive and often technically incorrect

16. Why is globular transfer generally avoided with GMAW?
By there current carrying capacity
Spatter problems and poor weld appearance
Guns
To limit the short circuiting current so that spatter is reduced

17. What processes are constant current (CC) power sources designed to be used with?
SMAW - GTAW
Shielding the molten weld metal from atmospheric contamination
Motor driven generators - Transformer rectifiers - and Inverter designs
Wire feeds smoothly (yet will slip should a problem occur in the gun)

18. In the GMAW process what does voltage control?
Short- circuiting transfer - Globular transfer - Spray transfer
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Puddle fluidity
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field

19. What type of power source is commonly used with a voltage sensing wire feeder?
1/4 inch to 1/2 inch
Constant current (CC)
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Constant- speed wire feeders and Voltage- sennsing wire feeders

20. What is the required arc voltage used for short circuit transfer?
AWS and CSA
Shielding the molten weld metal from atmospheric contamination
(DCEP) Direct Current Electrode Positive or Reverse polarity
12 to 22 arc volts

21. What happens when the electrode extension is increased?
The time rate of response for the current rise and fall
The resistace to electrical current flow increases with it. Causing the electrode to heat
Welding process that joins metals by heating them with an electric arc
Voltage is the force that overcomes resistance to allow amperage flow

22. What is the effect of too much slope?
Constant current (CC)
Insufficient current to melt the wire off cleanly
The Arc voltage
Pressure - The rate of flow of a shielding gas

23. What is a typical flow rate of CO2 for short circuit transfer?
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
5.8 to 12.5 L/min
Pressure vessels and the piping industry
Gas metal arc welding

24. What is a solenoid valve and what actuates it?
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
...
Short- circuiting transfer - Globular transfer - Spray transfer
Dry ice can form within the flow control openings and cause blockage of shielding gas

25. What is an advantage of pulsed arc transfer with GMAW?
5.8 to 12.5 L/min
V groove or U groove
Minutes of elapsed time continually run (out of 10 minutes)
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

26. What is the maximum distance that hard wire can be successfully pushed?
15 feet (4.5 meters)
National Electrical Manufactures Association
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Generally not as accurate

27. What is the main purpose of 'slope'?
To limit the short circuiting current so that spatter is reduced
3
Speed of the feed motor and - starting / stopping electrode feed
The negative side of a welding unit

28. What power sources are used with the GMAW Process?
Motor driven generators - Transformer rectifiers - and Inverter designs
Constant voltage (CV)
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
To prevent drawing of liquid CO2 (Carbon Dioxide)

29. Why is the term GMAW preferred over MIG or MAG?
The time rate of response for the current rise and fall
If you dont know this check your phone
These terms are quite restrictive and often technically incorrect
5.8 to 12.5 L/min

30. What is the purpose of the shielding gas used in GMAW?
Shielding the molten weld metal from atmospheric contamination
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Cause flaking - which can clog the liner and contact tube
Constant current (CC)

31. List several industries that would use GMAW
Welding process that joins metals by heating them with an electric arc
Pressure vessels and the piping industry
Minutes of elapsed time continually run (out of 10 minutes)
20 to 200 times per second

32. Regulators control_____________ flowmeters SHOW____________.
The Arc voltage
(DCEP) Direct Current Electrode Positive or Reverse polarity
Pressure - The rate of flow of a shielding gas
5.8 to 12.5 L/min

33. What would be an indication that the drive roll pressure is adjusted correctly?
Guns
5.8 to 12.5 L/min
Wire feeds smoothly (yet will slip should a problem occur in the gun)
These terms are quite restrictive and often technically incorrect

34. What does the wire feeder control?
Wire feed speed - Voltage control
Motor driven generators - Transformer rectifiers - and Inverter designs
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Speed of the feed motor and - starting / stopping electrode feed

35. What controls amperage when using GMAW?
5.8 to 12.5 L/min
Cause flaking - which can clog the liner and contact tube
Wire feed speed
1/4 inch to 1/2 inch

36. What does the term GMAW identify?
5.8 to 12.5 L/min
Gas metal arc welding
15 feet (4.5 meters)
Puddle fluidity

37. What are the 2 types of wire feeders available?
...
These terms are quite restrictive and often technically incorrect
Constant- speed wire feeders and Voltage- sennsing wire feeders
(DCEP) Direct Current Electrode Positive or Reverse polarity

38. Give a brief description of the GMAW process
85%
Wire feeds smoothly (yet will slip should a problem occur in the gun)
5.8 to 12.5 L/min
Welding process that joins metals by heating them with an electric arc

39. List the basic equipment requirements for the GMAW process
Controls the rate of flow of a shielding gas to the gun nozzle
5.8 to 12.5 L/min
3
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

40. What current and polarity is generally used with GMAW?
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Pressure - The rate of flow of a shielding gas
DCEP (Direct Current Electrode Positive) Reverse Polarity
Controls the rate of flow of a shielding gas to the gun nozzle

41. What is the purpose of the pick- up lead on a voltage sensing wire feeder?
Guns
Gives arc voltage values to the control system of the feeder
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Cause flaking - which can clog the liner and contact tube

42. List the factors that determine the mode of metal transfer
To limit the short circuiting current so that spatter is reduced
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Pressure - The rate of flow of a shielding gas
Welding process that joins metals by heating them with an electric arc

43. Draw a typical volt/amp curve that would be found with a power source designed for SMAW or GTAW
The time rate of response for the current rise and fall
When the filler wire is in direct contract with the base metal
If you dont know this check your phone
The resistace to electrical current flow increases with it. Causing the electrode to heat

44. What does inductance control?
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Minutes of elapsed time continually run (out of 10 minutes)
The time rate of response for the current rise and fall
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

45. What does a flowmeter do and what does it measure?
Controls the rate of flow of a shielding gas to the gun nozzle
Speed of the feed motor and - starting / stopping electrode feed
Voltage is the force that overcomes resistance to allow amperage flow
Flux cored wires

46. How many times per second does short circuiting take place?
Welding process that joins metals by heating them with an electric arc
These terms are quite restrictive and often technically incorrect
V groove or U groove
20 to 200 times per second

47. List 3 wire drive systems and give a short description of each
DCEP (Direct Current Electrode Positive) Reverse Polarity
Duty cycle
Push type: Wire is fed by a set of drive rolls located in the wire feed unit - Pull type: Drive rolls mounted in the gun itself - Push- pull type: Combination of the two
85%

48. Give a description of 'pinch effect'
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Welding process that joins metals by heating them with an electric arc
V groove or U groove
Shielding the molten weld metal from atmospheric contamination

49. In the GMAW process what does amperage control?
Generally not as accurate
Reducing the gas source pressure to a constant working pressure
Penetration and burn - off rate of the electrode
To prevent leakage - Carbon Dioxide (CO2)

50. What is the preferred drive roll design for solid wires?
V groove or U groove
Short- circuiting transfer - Globular transfer - Spray transfer
15 feet (4.5 meters)
Puddle fluidity

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