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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. What does the abbreviation NEMA stand for?
Pressure - The rate of flow of a shielding gas
SMAW - GTAW
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
National Electrical Manufactures Association

2. What happens when the electrode extension is increased?
The resistace to electrical current flow increases with it. Causing the electrode to heat
Wire feed speed - Voltage control
Constant current (CC)
Aluminum wire

3. In the GMAW process what does voltage control?
...
To limit the short circuiting current so that spatter is reduced
Puddle fluidity
Wire feed speed - Voltage control

4. List the three methods of metal transfer with GMAW
Generally not as accurate
Pressure - The rate of flow of a shielding gas
The Arc voltage
Short- circuiting transfer - Globular transfer - Spray transfer

5. Draw a typical volt amp curve for a machine that is designed for GMAW
20 to 200 times per second
If you dont know this check your phone
Insufficient current to melt the wire off cleanly
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

6. Why is the term GMAW preferred over MIG or MAG?
Motor driven generators - Transformer rectifiers - and Inverter designs
National Electrical Manufactures Association
These terms are quite restrictive and often technically incorrect
85%

7. What is the key advantage of short circuiting transfer?
Pressure - The rate of flow of a shielding gas
The time rate of response for the current rise and fall
Minimum distortion due to low heat input
Wire feed speed

8. What is the minimum % value of argon that must be present to use the spray transfer method of GMAW?
85%
Duty cycle
Shielding the molten weld metal from atmospheric contamination
The resistace to electrical current flow increases with it. Causing the electrode to heat

9. Give a description of 'pinch effect'
Aluminum wire
20 to 200 times per second
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Penetration and burn - off rate of the electrode

10. A 10 minute cycle of welding time vs cooling time a given machine can handle.
(DCEP) Direct Current Electrode Positive or Reverse polarity
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Duty cycle
These terms are quite restrictive and often technically incorrect

11. In the GMAW process what does amperage control?
To prevent drawing of liquid CO2 (Carbon Dioxide)
Pressure vessels and the piping industry
Penetration and burn - off rate of the electrode
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun

12. 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
SMAW - GTAW
Penetration and burn - off rate of the electrode
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

13. What is the reason glass 'tube' type flowmeters must have the tube mounted truly vertical?
Penetration and burn - off rate of the electrode
3
Shielding the molten weld metal from atmospheric contamination
...

14. What output on the welding machine is used to rate the duty cycle?
AWS and CSA
Generally not as accurate
Wire feed speed - Voltage control
Minutes of elapsed time continually run (out of 10 minutes)

15. What is the disadvantage of the gauge preset type of regulator/flowmeter?
Spatter problems and poor weld appearance
Guns
Generally not as accurate
The time rate of response for the current rise and fall

16. Why is a line heater required when using GMAW?
Duty cycle
V groove or U groove
Dry ice can form within the flow control openings and cause blockage of shielding gas
AWS and CSA

17. Regulators control_____________ flowmeters SHOW____________.
If you dont know this check your phone
Pressure - The rate of flow of a shielding gas
Minutes of elapsed time continually run (out of 10 minutes)
85%

18. What is a typical flow rate of CO2 for short circuit transfer?
5.8 to 12.5 L/min
DCEP (Direct Current Electrode Positive) Reverse Polarity
If you dont know this check your phone
Flux cored wires

19. What is the purpose of the shielding gas used in GMAW?
Minimum distortion due to low heat input
Short- circuiting transfer - Globular transfer - Spray transfer
Shielding the molten weld metal from atmospheric contamination
12 to 22 arc volts

20. What is an advantage of pulsed arc transfer with GMAW?
15 feet (4.5 meters)
(DCEP) Direct Current Electrode Positive or Reverse polarity
The negative side of a welding unit
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

21. What is the purpose of a regulator and what does it indicate on its gauges?
Speed of the feed motor and - starting / stopping electrode feed
Insufficient current to melt the wire off cleanly
Shielding the molten weld metal from atmospheric contamination
Reducing the gas source pressure to a constant working pressure

22. When is the metal transferred with short circuit transfer?
The resistace to electrical current flow increases with it. Causing the electrode to heat
12 to 22 arc volts
When the filler wire is in direct contract with the base metal
Gas metal arc welding

23. What is the main purpose of 'slope'?
To limit the short circuiting current so that spatter is reduced
By there current carrying capacity
Puddle fluidity
Duty cycle

24. What are the 2 types of wire feeders available?
Dry ice can form within the flow control openings and cause blockage of shielding gas
The Arc voltage
Guns
Constant- speed wire feeders and Voltage- sennsing wire feeders

25. What 2 organizations designate specifications for GMAW wires?
V groove or U groove
Motor driven generators - Transformer rectifiers - and Inverter designs
Speed of the feed motor and - starting / stopping electrode feed
AWS and CSA

26. What does voltage do in an electrical circuit?
Pressure vessels and the piping industry
Guns
V groove or U groove
Voltage is the force that overcomes resistance to allow amperage flow

27. What is the required arc voltage used for short circuit transfer?
The negative side of a welding unit
The resistace to electrical current flow increases with it. Causing the electrode to heat
12 to 22 arc volts
Shielding the molten weld metal from atmospheric contamination

28. What does inductance control?
The time rate of response for the current rise and fall
Constant- speed wire feeders and Voltage- sennsing wire feeders
By there current carrying capacity
Wire feed speed - Voltage control

29. Why must CO2 cylinders be used in the vertical position?
The negative side of a welding unit
Constant voltage (CV)
Aluminum wire
To prevent drawing of liquid CO2 (Carbon Dioxide)

30. Why is a fiber washer required and what cylinder gas requires it?
To prevent leakage - Carbon Dioxide (CO2)
15 feet (4.5 meters)
By there current carrying capacity
The negative side of a welding unit

31. What is the maximum distance that hard wire can be successfully pushed?
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Puddle fluidity
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
15 feet (4.5 meters)

32. List the factors that determine the mode of metal transfer
AWS and CSA
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Gas metal arc welding
Wire feeds smoothly (yet will slip should a problem occur in the gun)

33. What type of power source is commonly used with a voltage sensing wire feeder?
By there current carrying capacity
Duty cycle
Constant current (CC)
To prevent drawing of liquid CO2 (Carbon Dioxide)

34. What would be an indication that the drive roll pressure is adjusted correctly?
By there current carrying capacity
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Minutes of elapsed time continually run (out of 10 minutes)
Wire feeds smoothly (yet will slip should a problem occur in the gun)

35. What is another term for electrode holders for GMAW?
Guns
Constant- speed wire feeders and Voltage- sennsing wire feeders
V groove or U groove
The Arc voltage

36. How are GMAW guns rated?
AWS and CSA
By there current carrying capacity
To limit the short circuiting current so that spatter is reduced
Guns

37. With straight polarity where is 2/3 of the arc energy?
Spatter problems and poor weld appearance
Shielding the molten weld metal from atmospheric contamination
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

38. What type of power source is used with a constant speed wire feeder?
The Arc voltage
SMAW - GTAW
Constant voltage (CV)
When the filler wire is in direct contract with the base metal

39. When using flat drive rolls with too much pressure on copper coated solid wires what problem could take place?
Dry ice can form within the flow control openings and cause blockage of shielding gas
Cause flaking - which can clog the liner and contact tube
Flux cored wires
DCEP (Direct Current Electrode Positive) Reverse Polarity

40. List the basic equipment requirements for the GMAW process
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
Spatter problems and poor weld appearance
Gas metal arc welding
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

41. Is the arc voltage for spray transfer higher or lower than that used for short circuit transfer?
Higher 26 to 35 arc volts
Wire feed speed - Voltage control
The resistace to electrical current flow increases with it. Causing the electrode to heat
Motor driven generators - Transformer rectifiers - and Inverter designs

42. What does the term GMAW identify?
Gas metal arc welding
Constant voltage (CV)
Minimum distortion due to low heat input
Reducing the gas source pressure to a constant working pressure

43. What wire are knurled drive rolls most commonly used on?
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Flux cored wires
Aluminum wire
SMAW - GTAW

44. List 3 forms compressed gases may be supplied for welding
Constant current (CC)
The time rate of response for the current rise and fall
DCEP (Direct Current Electrode Positive) Reverse Polarity
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

45. What is a solenoid valve and what actuates it?
Higher 26 to 35 arc volts
Wire feed speed - Voltage control
SMAW - GTAW
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun

46. What does a flowmeter do and what does it measure?
20 to 200 times per second
Controls the rate of flow of a shielding gas to the gun nozzle
Constant- speed wire feeders and Voltage- sennsing wire feeders
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field

47. How many times per second does short circuiting take place?
Penetration and burn - off rate of the electrode
Short- circuiting transfer - Globular transfer - Spray transfer
3
20 to 200 times per second

48. What power sources are used with the GMAW Process?
DCEP (Direct Current Electrode Positive) Reverse Polarity
Motor driven generators - Transformer rectifiers - and Inverter designs
Constant voltage (CV)
Minutes of elapsed time continually run (out of 10 minutes)

49. What does the wire feeder control?
AWS and CSA
Puddle fluidity
Dry ice can form within the flow control openings and cause blockage of shielding gas
Speed of the feed motor and - starting / stopping electrode feed

50. What is the effect of too much slope?
To prevent leakage - Carbon Dioxide (CO2)
The Arc voltage
Insufficient current to melt the wire off cleanly
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

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Gas Metal Arc Welding

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