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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. List several industries that would use GMAW
Flux cored wires
The negative side of a welding unit
National Electrical Manufactures Association
Pressure vessels and the piping industry

2. In the GMAW process what does voltage control?
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
Puddle fluidity
5.8 to 12.5 L/min
The time rate of response for the current rise and fall

3. What is the maximum distance that hard wire can be successfully pushed?
To prevent leakage - Carbon Dioxide (CO2)
15 feet (4.5 meters)
Puddle fluidity
Motor driven generators - Transformer rectifiers - and Inverter designs

4. What is the preferred drive roll design for solid wires?
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
V groove or U groove
When the filler wire is in direct contract with the base metal
The Arc voltage

5. What term is used to describe when the workpiece is hooked to the negative pole on the power source?
Welding process that joins metals by heating them with an electric arc
V groove or U groove
Motor driven generators - Transformer rectifiers - and Inverter designs
(DCEP) Direct Current Electrode Positive or Reverse polarity

6. What power sources are used with the GMAW Process?
Motor driven generators - Transformer rectifiers - and Inverter designs
Puddle fluidity
1/4 inch to 1/2 inch
AWS and CSA

7. What are the 2 types of wire feeders available?
Constant- speed wire feeders and Voltage- sennsing wire feeders
To prevent leakage - Carbon Dioxide (CO2)
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Welding process that joins metals by heating them with an electric arc

8. What is the reason glass 'tube' type flowmeters must have the tube mounted truly vertical?
...
SMAW - GTAW
When the filler wire is in direct contract with the base metal
Gas metal arc welding

9. Why is a fiber washer required and what cylinder gas requires it?
Controls the rate of flow of a shielding gas to the gun nozzle
Generally not as accurate
Wire feeds smoothly (yet will slip should a problem occur in the gun)
To prevent leakage - Carbon Dioxide (CO2)

10. What is an advantage of pulsed arc transfer with GMAW?
If you dont know this check your phone
Guns
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
Shielding the molten weld metal from atmospheric contamination

11. What current and polarity is generally used with GMAW?
These terms are quite restrictive and often technically incorrect
Spatter problems and poor weld appearance
DCEP (Direct Current Electrode Positive) Reverse Polarity
Wire feeds smoothly (yet will slip should a problem occur in the gun)

12. 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
Wire feed speed
Dry ice can form within the flow control openings and cause blockage of shielding gas
Reducing the gas source pressure to a constant working pressure

13. List the factors that determine the mode of metal transfer
When the filler wire is in direct contract with the base metal
Minimum distortion due to low heat input
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Flux cored wires

14. What happens when the electrode extension is increased?
V groove or U groove
5.8 to 12.5 L/min
The resistace to electrical current flow increases with it. Causing the electrode to heat
Insufficient current to melt the wire off cleanly

15. What type of power source is commonly used with a voltage sensing wire feeder?
Penetration and burn - off rate of the electrode
Constant current (CC)
Wire feed speed - Voltage control
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld

16. Why must CO2 cylinders be used in the vertical position?
Minimum distortion due to low heat input
Reducing the gas source pressure to a constant working pressure
Puddle fluidity
To prevent drawing of liquid CO2 (Carbon Dioxide)

17. What does the term GMAW identify?
Generally not as accurate
Flux cored wires
Gas metal arc welding
Penetration and burn - off rate of the electrode

18. How are GMAW guns rated?
Flux cored wires
By there current carrying capacity
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld

19. A machine with a 70% duty cycle can run at its max for 7 minutes with a cooling cycle of only _ minutes.
Dry ice can form within the flow control openings and cause blockage of shielding gas
3
15 feet (4.5 meters)
By there current carrying capacity

20. A pull type drive system is usually used on what type of material?
Constant current (CC)
The time rate of response for the current rise and fall
...
Aluminum wire

21. What effect does increasing and decreasing the inductance have on the weld?
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Spatter problems and poor weld appearance
DCEP (Direct Current Electrode Positive) Reverse Polarity

22. When using flat drive rolls with too much pressure on copper coated solid wires what problem could take place?
Shielding the molten weld metal from atmospheric contamination
Cause flaking - which can clog the liner and contact tube
Wire feed speed
12 to 22 arc volts

23. What is the required arc voltage used for short circuit transfer?
Shielding the molten weld metal from atmospheric contamination
12 to 22 arc volts
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
(DCEP) Direct Current Electrode Positive or Reverse polarity

24. Draw a typical volt amp curve for a machine that is designed for GMAW
The negative side of a welding unit
Wire feed speed - Voltage control
Puddle fluidity
If you dont know this check your phone

25. List 3 forms compressed gases may be supplied for welding
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Flux cored wires
DCEP (Direct Current Electrode Positive) Reverse Polarity
Constant current (CC)

26. What is the recommended electrode stick- out for .035 solid wire?
Wire feed speed
(DCEP) Direct Current Electrode Positive or Reverse polarity
3
1/4 inch to 1/2 inch

27. With straight polarity where is 2/3 of the arc energy?
To limit the short circuiting current so that spatter is reduced
Reducing the gas source pressure to a constant working pressure
The negative side of a welding unit
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field

28. What wire are knurled drive rolls most commonly used on?
Flux cored wires
To prevent drawing of liquid CO2 (Carbon Dioxide)
Voltage is the force that overcomes resistance to allow amperage flow
Duty cycle

29. What is the disadvantage of the gauge preset type of regulator/flowmeter?
1/4 inch to 1/2 inch
AWS and CSA
Generally not as accurate
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun

30. What does voltage do in an electrical circuit?
Flux cored wires
If you dont know this check your phone
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Voltage is the force that overcomes resistance to allow amperage flow

31. What is another term for electrode holders for GMAW?
To prevent leakage - Carbon Dioxide (CO2)
The Arc voltage
Voltage is the force that overcomes resistance to allow amperage flow
Guns

32. What is the key advantage of short circuiting transfer?
Minimum distortion due to low heat input
Reducing the gas source pressure to a constant working pressure
Shielding the molten weld metal from atmospheric contamination
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld

33. What does the wire feeder control?
Gives arc voltage values to the control system of the feeder
Speed of the feed motor and - starting / stopping electrode feed
Minutes of elapsed time continually run (out of 10 minutes)
Voltage is the force that overcomes resistance to allow amperage flow

34. What controls amperage when using GMAW?
When the filler wire is in direct contract with the base metal
Wire feed speed
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld

35. List the three methods of metal transfer with GMAW
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Short- circuiting transfer - Globular transfer - Spray transfer
Minimum distortion due to low heat input
Flux cored wires

36. List the basic equipment requirements for the GMAW process
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
To prevent leakage - Carbon Dioxide (CO2)
Dry ice can form within the flow control openings and cause blockage of shielding gas
Short- circuiting transfer - Globular transfer - Spray transfer

37. In the GMAW process what does amperage control?
Penetration and burn - off rate of the electrode
The Arc voltage
DCEP (Direct Current Electrode Positive) Reverse Polarity
The time rate of response for the current rise and fall

38. What does a flowmeter do and what does it measure?
Penetration and burn - off rate of the electrode
Speed of the feed motor and - starting / stopping electrode feed
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Controls the rate of flow of a shielding gas to the gun nozzle

39. What does the abbreviation NEMA stand for?
Controls the rate of flow of a shielding gas to the gun nozzle
Minutes of elapsed time continually run (out of 10 minutes)
National Electrical Manufactures Association
The Arc voltage

40. What is the main purpose of 'slope'?
To limit the short circuiting current so that spatter is reduced
Penetration and burn - off rate of the electrode
Guns
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts

41. Draw a typical volt/amp curve that would be found with a power source designed for SMAW or GTAW
If you dont know this check your phone
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
The time rate of response for the current rise and fall
V groove or U groove

42. Is the arc voltage for spray transfer higher or lower than that used for short circuit transfer?
Higher 26 to 35 arc volts
20 to 200 times per second
Pressure vessels and the piping industry
SMAW - GTAW

43. Why is globular transfer generally avoided with GMAW?
Spatter problems and poor weld appearance
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
(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

44. How many times per second does short circuiting take place?
Short- circuiting transfer - Globular transfer - Spray transfer
20 to 200 times per second
AWS and CSA
If you dont know this check your phone

45. What type of power source is used with a constant speed wire feeder?
Constant voltage (CV)
Short- circuiting transfer - Globular transfer - Spray transfer
To prevent drawing of liquid CO2 (Carbon Dioxide)
To limit the short circuiting current so that spatter is reduced

46. Regulators control_____________ flowmeters SHOW____________.
The time rate of response for the current rise and fall
Gas metal arc welding
Pressure - The rate of flow of a shielding gas
Short- circuiting transfer - Globular transfer - Spray transfer

47. Why is the term GMAW preferred over MIG or MAG?
Reducing the gas source pressure to a constant working pressure
3
These terms are quite restrictive and often technically incorrect
Aluminum wire

48. What is the minimum % value of argon that must be present to use the spray transfer method of GMAW?
85%
Cause flaking - which can clog the liner and contact tube
The negative side of a welding unit
SMAW - GTAW

49. What output on the welding machine is used to rate the duty cycle?
85%
To limit the short circuiting current so that spatter is reduced
Minutes of elapsed time continually run (out of 10 minutes)
Dry ice can form within the flow control openings and cause blockage of shielding gas

50. Give a brief description of the GMAW process
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
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)
The resistace to electrical current flow increases with it. Causing the electrode to heat

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Gas Metal Arc Welding

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