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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 voltage do in an electrical circuit?
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
Speed of the feed motor and - starting / stopping electrode feed
Voltage is the force that overcomes resistance to allow amperage flow
3

2. What is the preferred drive roll design for solid wires?
Shielding the molten weld metal from atmospheric contamination
When the filler wire is in direct contract with the base metal
V groove or U groove
Penetration and burn - off rate of the electrode

3. What does inductance control?
Reducing the gas source pressure to a constant working pressure
The time rate of response for the current rise and fall
12 to 22 arc volts
Gas metal arc welding

4. What is the minimum % value of argon that must be present to use the spray transfer method of GMAW?
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
85%
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
If you dont know this check your phone

5. What is the reason glass 'tube' type flowmeters must have the tube mounted truly vertical?
15 feet (4.5 meters)
Duty cycle
...
85%

6. What is the purpose of a regulator and what does it indicate on its gauges?
When the filler wire is in direct contract with the base metal
Reducing the gas source pressure to a constant working pressure
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Duty cycle

7. What is the disadvantage of the gauge preset type of regulator/flowmeter?
Dry ice can form within the flow control openings and cause blockage of shielding gas
Generally not as accurate
...
85%

8. What is the purpose of the shielding gas used in GMAW?
Gas metal arc welding
Puddle fluidity
5.8 to 12.5 L/min
Shielding the molten weld metal from atmospheric contamination

9. Regulators control_____________ flowmeters SHOW____________.
5.8 to 12.5 L/min
Pressure - The rate of flow of a shielding gas
To limit the short circuiting current so that spatter is reduced
These terms are quite restrictive and often technically incorrect

10. What does the wire feeder control?
Voltage is the force that overcomes resistance to allow amperage flow
Speed of the feed motor and - starting / stopping electrode feed
(DCEP) Direct Current Electrode Positive or Reverse polarity
Spatter problems and poor weld appearance

11. What are the 2 types of wire feeders available?
Constant- speed wire feeders and Voltage- sennsing wire feeders
If you dont know this check your phone
To prevent drawing of liquid CO2 (Carbon Dioxide)
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field

12. List the three methods of metal transfer with GMAW
V groove or U groove
The time rate of response for the current rise and fall
Constant- speed wire feeders and Voltage- sennsing wire feeders
Short- circuiting transfer - Globular transfer - Spray transfer

13. What current and polarity is generally used with GMAW?
Constant- speed wire feeders and Voltage- sennsing wire feeders
Welding process that joins metals by heating them with an electric arc
Aluminum wire
DCEP (Direct Current Electrode Positive) Reverse Polarity

14. What is a solenoid valve and what actuates it?
85%
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
V groove or U groove
When the filler wire is in direct contract with the base metal

15. In the GMAW process what does amperage control?
Penetration and burn - off rate of the electrode
If you dont know this check your phone
Duty cycle
To limit the short circuiting current so that spatter is reduced

16. In the GMAW process what does voltage control?
85%
To prevent drawing of liquid CO2 (Carbon Dioxide)
Puddle fluidity
(DCEP) Direct Current Electrode Positive or Reverse polarity

17. What term is used to describe when the workpiece is hooked to the negative pole on the power source?
Flux cored wires
(DCEP) Direct Current Electrode Positive or Reverse polarity
12 to 22 arc volts
Dry ice can form within the flow control openings and cause blockage of shielding gas

18. What power sources are used with the GMAW Process?
The Arc voltage
Wire feed speed
Motor driven generators - Transformer rectifiers - and Inverter designs
AWS and CSA

19. Why must CO2 cylinders be used in the vertical position?
Higher 26 to 35 arc volts
Constant current (CC)
To prevent drawing of liquid CO2 (Carbon Dioxide)
Flux cored wires

20. What effect does increasing and decreasing the inductance have on the weld?
1/4 inch to 1/2 inch
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Voltage is the force that overcomes resistance to allow amperage flow
Reducing the gas source pressure to a constant working pressure

21. When using flat drive rolls with too much pressure on copper coated solid wires what problem could take place?
To prevent leakage - Carbon Dioxide (CO2)
Constant- speed wire feeders and Voltage- sennsing wire feeders
Cause flaking - which can clog the liner and contact tube
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

22. When is the metal transferred with short circuit transfer?
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
When the filler wire is in direct contract with the base metal
National Electrical Manufactures Association
Minimum distortion due to low heat input

23. Draw a typical volt/amp curve that would be found with a power source designed for SMAW or GTAW
Flux cored wires
By there current carrying capacity
If you dont know this check your phone
When the filler wire is in direct contract with the base metal

24. Why is the term GMAW preferred over MIG or MAG?
These terms are quite restrictive and often technically incorrect
Flux cored wires
Constant- speed wire feeders and Voltage- sennsing wire feeders
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

25. List several industries that would use GMAW
Minutes of elapsed time continually run (out of 10 minutes)
...
Pressure vessels and the piping industry
5.8 to 12.5 L/min

26. Is the arc voltage for spray transfer higher or lower than that used for short circuit transfer?
To prevent drawing of liquid CO2 (Carbon Dioxide)
Higher 26 to 35 arc volts
Welding process that joins metals by heating them with an electric arc
Controls the rate of flow of a shielding gas to the gun nozzle

27. What type of power source is used with a constant speed wire feeder?
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
These terms are quite restrictive and often technically incorrect
Guns
Constant voltage (CV)

28. What controls amperage when using GMAW?
Cause flaking - which can clog the liner and contact tube
85%
National Electrical Manufactures Association
Wire feed speed

29. Give a brief description of the GMAW process
Constant voltage (CV)
Welding process that joins metals by heating them with an electric arc
Pressure - The rate of flow of a shielding gas
15 feet (4.5 meters)

30. Why is a fiber washer required and what cylinder gas requires it?
To prevent leakage - Carbon Dioxide (CO2)
Flux cored wires
Generally not as accurate
Aluminum wire

31. List the basic equipment requirements for the GMAW process
Cause flaking - which can clog the liner and contact tube
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Insufficient current to melt the wire off cleanly
Short- circuiting transfer - Globular transfer - Spray transfer

32. What 2 organizations designate specifications for GMAW wires?
Gas metal arc welding
Speed of the feed motor and - starting / stopping electrode feed
When the filler wire is in direct contract with the base metal
AWS and CSA

33. List 3 wire drive systems and give a short description of each
The Arc voltage
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
If you dont know this check your phone

34. What is another term for electrode holders for GMAW?
If you dont know this check your phone
Dry ice can form within the flow control openings and cause blockage of shielding gas
To limit the short circuiting current so that spatter is reduced
Guns

35. What happens when the electrode extension is increased?
To prevent drawing of liquid CO2 (Carbon Dioxide)
DCEP (Direct Current Electrode Positive) Reverse Polarity
The resistace to electrical current flow increases with it. Causing the electrode to heat
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun

36. What would be an indication that the drive roll pressure is adjusted correctly?
Wire feeds smoothly (yet will slip should a problem occur in the gun)
The negative side of a welding unit
Shielding the molten weld metal from atmospheric contamination
Puddle fluidity

37. What type of power source is commonly used with a voltage sensing wire feeder?
Constant current (CC)
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
85%
By there current carrying capacity

38. What is the effect of too much slope?
Penetration and burn - off rate of the electrode
Insufficient current to melt the wire off cleanly
Gives arc voltage values to the control system of the feeder
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

39. What wire are knurled drive rolls most commonly used on?
Spatter problems and poor weld appearance
Dry ice can form within the flow control openings and cause blockage of shielding gas
Flux cored wires
12 to 22 arc volts

40. Why is globular transfer generally avoided with GMAW?
To prevent leakage - Carbon Dioxide (CO2)
By there current carrying capacity
Spatter problems and poor weld appearance
Motor driven generators - Transformer rectifiers - and Inverter designs

41. List the factors that determine the mode of metal transfer
Controls the rate of flow of a shielding gas to the gun nozzle
National Electrical Manufactures Association
Generally not as accurate
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld

42. What is the main purpose of 'slope'?
15 feet (4.5 meters)
Constant voltage (CV)
Motor driven generators - Transformer rectifiers - and Inverter designs
To limit the short circuiting current so that spatter is reduced

43. What does the abbreviation NEMA stand for?
1/4 inch to 1/2 inch
National Electrical Manufactures Association
Wire feed speed
Gives arc voltage values to the control system of the feeder

44. What does a flowmeter do and what does it measure?
Short- circuiting transfer - Globular transfer - Spray transfer
AWS and CSA
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
Controls the rate of flow of a shielding gas to the gun nozzle

45. With straight polarity where is 2/3 of the arc energy?
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Speed of the feed motor and - starting / stopping electrode feed
Constant current (CC)
The negative side of a welding unit

46. What processes are constant current (CC) power sources designed to be used with?
National Electrical Manufactures Association
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
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

47. A pull type drive system is usually used on what type of material?
When the filler wire is in direct contract with the base metal
Welding process that joins metals by heating them with an electric arc
Aluminum wire
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts

48. What is the key advantage of short circuiting transfer?
Reducing the gas source pressure to a constant working pressure
Puddle fluidity
Minimum distortion due to low heat input
Pressure vessels and the piping industry

49. Why is a line heater required when using GMAW?
If you dont know this check your phone
Cause flaking - which can clog the liner and contact tube
Dry ice can form within the flow control openings and cause blockage of shielding gas
Shielding the molten weld metal from atmospheric contamination

50. What is a typical flow rate of CO2 for short circuit transfer?
5.8 to 12.5 L/min
Aluminum wire
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
20 to 200 times per second

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Gas Metal Arc Welding

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