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Gas Metal Arc Welding

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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1. A pull type drive system is usually used on what type of material?
Pressure - The rate of flow of a shielding gas
Short- circuiting transfer - Globular transfer - Spray transfer
12 to 22 arc volts
Aluminum wire

2. With straight polarity where is 2/3 of the arc energy?
AWS and CSA
Welding process that joins metals by heating them with an electric arc
(DCEP) Direct Current Electrode Positive or Reverse polarity
The negative side of a welding unit

3. What type of power source is commonly used with a voltage sensing wire feeder?
Shielding the molten weld metal from atmospheric contamination
Wire feed speed - Voltage control
Constant current (CC)
Higher 26 to 35 arc volts

4. What effect does increasing and decreasing the inductance have on the weld?
Reducing the gas source pressure to a constant working pressure
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Dry ice can form within the flow control openings and cause blockage of shielding gas
Penetration and burn - off rate of the electrode

5. What is the disadvantage of the gauge preset type of regulator/flowmeter?
Insufficient current to melt the wire off cleanly
Short- circuiting transfer - Globular transfer - Spray transfer
If you dont know this check your phone
Generally not as accurate

6. A machine with a 70% duty cycle can run at its max for 7 minutes with a cooling cycle of only _ minutes.
Shielding the molten weld metal from atmospheric contamination
3
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

7. What are the 2 types of wire feeders available?
Constant- speed wire feeders and Voltage- sennsing wire feeders
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
The negative side of a welding unit
Welding process that joins metals by heating them with an electric arc

8. What would be an indication that the drive roll pressure is adjusted correctly?
These terms are quite restrictive and often technically incorrect
Welding process that joins metals by heating them with an electric arc
...
Wire feeds smoothly (yet will slip should a problem occur in the gun)

9. In the GMAW process what does voltage control?
Higher 26 to 35 arc volts
Puddle fluidity
20 to 200 times per second
Reducing the gas source pressure to a constant working pressure

10. What does the wire feeder control?
Constant voltage (CV)
Speed of the feed motor and - starting / stopping electrode feed
Wire feed speed - Voltage control
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

11. What is the main purpose of 'slope'?
Penetration and burn - off rate of the electrode
Gas metal arc welding
To limit the short circuiting current so that spatter is reduced
Puddle fluidity

12. What current and polarity is generally used with GMAW?
12 to 22 arc volts
National Electrical Manufactures Association
Cause flaking - which can clog the liner and contact tube
DCEP (Direct Current Electrode Positive) Reverse Polarity

13. What term is used to describe when the workpiece is hooked to the negative pole on the power source?
Aluminum wire
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
(DCEP) Direct Current Electrode Positive or Reverse polarity

14. List 3 forms compressed gases may be supplied for welding
Spatter problems and poor weld appearance
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
These terms are quite restrictive and often technically incorrect
Speed of the feed motor and - starting / stopping electrode feed

15. Why is globular transfer generally avoided with GMAW?
(DCEP) Direct Current Electrode Positive or Reverse polarity
Shielding the molten weld metal from atmospheric contamination
Cause flaking - which can clog the liner and contact tube
Spatter problems and poor weld appearance

16. What is an advantage of pulsed arc transfer with GMAW?
Controls the rate of flow of a shielding gas to the gun nozzle
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
12 to 22 arc volts
1/4 inch to 1/2 inch

17. Give a brief description of the GMAW process
Welding process that joins metals by heating them with an electric arc
Minimum distortion due to low heat input
Wire feed speed
Penetration and burn - off rate of the electrode

18. Why must CO2 cylinders be used in the vertical position?
15 feet (4.5 meters)
Short- circuiting transfer - Globular transfer - Spray transfer
To prevent drawing of liquid CO2 (Carbon Dioxide)
DCEP (Direct Current Electrode Positive) Reverse Polarity

19. What is the minimum % value of argon that must be present to use the spray transfer method of GMAW?
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
To limit the short circuiting current so that spatter is reduced
85%

20. How many times per second does short circuiting take place?
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Minimum distortion due to low heat input
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
20 to 200 times per second

21. What happens when the electrode extension is increased?
The resistace to electrical current flow increases with it. Causing the electrode to heat
85%
Duty cycle
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

22. Why is the term GMAW preferred over MIG or MAG?
DCEP (Direct Current Electrode Positive) Reverse Polarity
Penetration and burn - off rate of the electrode
These terms are quite restrictive and often technically incorrect
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

23. Draw a typical volt/amp curve that would be found with a power source designed for SMAW or GTAW
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Aluminum wire
If you dont know this check your phone
Shielding the molten weld metal from atmospheric contamination

24. What wire are knurled drive rolls most commonly used on?
Flux cored wires
Spatter problems and poor weld appearance
Wire feed speed
Generally not as accurate

25. What power sources are used with the GMAW Process?
The negative side of a welding unit
Motor driven generators - Transformer rectifiers - and Inverter designs
Puddle fluidity
The resistace to electrical current flow increases with it. Causing the electrode to heat

26. What does inductance control?
3
Gas metal arc welding
The Arc voltage
The time rate of response for the current rise and fall

27. When using flat drive rolls with too much pressure on copper coated solid wires what problem could take place?
15 feet (4.5 meters)
Welding process that joins metals by heating them with an electric arc
Cause flaking - which can clog the liner and contact tube
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld

28. What is the purpose of the shielding gas used in GMAW?
Spatter problems and poor weld appearance
Pressure vessels and the piping industry
Shielding the molten weld metal from atmospheric contamination
Gas metal arc welding

29. What 2 controls are found on a GMAW set- up?
Wire feed speed - Voltage control
Generally not as accurate
If you dont know this check your phone
Controls the rate of flow of a shielding gas to the gun nozzle

30. What type of power source is used with a constant speed wire feeder?
To prevent leakage - Carbon Dioxide (CO2)
Puddle fluidity
5.8 to 12.5 L/min
Constant voltage (CV)

31. Give a description of 'pinch effect'
If you dont know this check your phone
3
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Constant current (CC)

32. What 2 organizations designate specifications for GMAW wires?
By there current carrying capacity
AWS and CSA
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
DCEP (Direct Current Electrode Positive) Reverse Polarity

33. List the factors that determine the mode of metal transfer
Constant- speed wire feeders and Voltage- sennsing wire feeders
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Guns

34. Draw a typical volt amp curve for a machine that is designed for GMAW
To prevent drawing of liquid CO2 (Carbon Dioxide)
5.8 to 12.5 L/min
Wire feed speed
If you dont know this check your phone

35. A 10 minute cycle of welding time vs cooling time a given machine can handle.
If you dont know this check your phone
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Duty cycle
Wire feed speed

36. What is the preferred drive roll design for solid wires?
5.8 to 12.5 L/min
Wire feed speed
By there current carrying capacity
V groove or U groove

37. What is another term for electrode holders for GMAW?
To prevent drawing of liquid CO2 (Carbon Dioxide)
85%
Aluminum wire
Guns

38. List the basic equipment requirements for the GMAW process
V groove or U groove
When the filler wire is in direct contract with the base metal
Puddle fluidity
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

39. Why is a fiber washer required and what cylinder gas requires it?
Short- circuiting transfer - Globular transfer - Spray transfer
National Electrical Manufactures Association
Dry ice can form within the flow control openings and cause blockage of shielding gas
To prevent leakage - Carbon Dioxide (CO2)

40. What is the recommended electrode stick- out for .035 solid wire?
Puddle fluidity
Constant voltage (CV)
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
1/4 inch to 1/2 inch

41. What is the key advantage of short circuiting transfer?
Minimum distortion due to low heat input
Wire feed speed
85%
Dry ice can form within the flow control openings and cause blockage of shielding gas

42. What does voltage do in an electrical circuit?
3
Voltage is the force that overcomes resistance to allow amperage flow
Short- circuiting transfer - Globular transfer - Spray transfer
Penetration and burn - off rate of the electrode

43. How are GMAW guns rated?
By there current carrying capacity
DCEP (Direct Current Electrode Positive) Reverse Polarity
National Electrical Manufactures Association
Constant- speed wire feeders and Voltage- sennsing wire feeders

44. List the three methods of metal transfer with GMAW
Shielding the molten weld metal from atmospheric contamination
Cause flaking - which can clog the liner and contact tube
Short- circuiting transfer - Globular transfer - Spray transfer
Wire feed speed

45. What is the purpose of the pick- up lead on a voltage sensing wire feeder?
Welding process that joins metals by heating them with an electric arc
Gives arc voltage values to the control system of the feeder
If you dont know this check your phone
The Arc voltage

46. What is the purpose of a regulator and what does it indicate on its gauges?
Reducing the gas source pressure to a constant working pressure
When the filler wire is in direct contract with the base metal
(DCEP) Direct Current Electrode Positive or Reverse polarity
Welding process that joins metals by heating them with an electric arc

47. What controls amperage when using GMAW?
Wire feed speed
Speed of the feed motor and - starting / stopping electrode feed
The time rate of response for the current rise and fall
Puddle fluidity

48. What is a typical flow rate of CO2 for short circuit transfer?
5.8 to 12.5 L/min
The resistace to electrical current flow increases with it. Causing the electrode to heat
Generally not as accurate
To prevent leakage - Carbon Dioxide (CO2)

49. In the GMAW process what does amperage control?
15 feet (4.5 meters)
DCEP (Direct Current Electrode Positive) Reverse Polarity
Penetration and burn - off rate of the electrode
Minimum distortion due to low heat input

50. Regulators control_____________ flowmeters SHOW____________.
Puddle fluidity
Gives arc voltage values to the control system of the feeder
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Pressure - The rate of flow of a shielding gas

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Gas Metal Arc Welding

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