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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. Why is globular transfer generally avoided with GMAW?
When the filler wire is in direct contract with the base metal
Minutes of elapsed time continually run (out of 10 minutes)
Voltage is the force that overcomes resistance to allow amperage flow
Spatter problems and poor weld appearance

2. Draw a typical volt/amp curve that would be found with a power source designed for SMAW or GTAW
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Short- circuiting transfer - Globular transfer - Spray transfer
Motor driven generators - Transformer rectifiers - and Inverter designs
If you dont know this check your phone

3. What does the wire feeder control?
Constant- speed wire feeders and Voltage- sennsing wire feeders
Speed of the feed motor and - starting / stopping electrode feed
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
To prevent drawing of liquid CO2 (Carbon Dioxide)

4. Is the arc voltage for spray transfer higher or lower than that used for short circuit transfer?
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
85%
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Higher 26 to 35 arc volts

5. In the GMAW process what does amperage control?
Aluminum wire
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
5.8 to 12.5 L/min
Penetration and burn - off rate of the electrode

6. Give a description of 'pinch effect'
To limit the short circuiting current so that spatter is reduced
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Flux cored wires
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun

7. Regulators control_____________ flowmeters SHOW____________.
When the filler wire is in direct contract with the base metal
Pressure - The rate of flow of a shielding gas
1/4 inch to 1/2 inch
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

8. 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
Spatter problems and poor weld appearance
Puddle fluidity

9. What is the key advantage of short circuiting transfer?
National Electrical Manufactures Association
Higher 26 to 35 arc volts
Dry ice can form within the flow control openings and cause blockage of shielding gas
Minimum distortion due to low heat input

10. What is the disadvantage of the gauge preset type of regulator/flowmeter?
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Generally not as accurate
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

11. What is another term for electrode holders for GMAW?
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Guns
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
Pressure vessels and the piping industry

12. Why is the term GMAW preferred over MIG or MAG?
Speed of the feed motor and - starting / stopping electrode feed
Constant- speed wire feeders and Voltage- sennsing wire feeders
These terms are quite restrictive and often technically incorrect
(DCEP) Direct Current Electrode Positive or Reverse polarity

13. How many times per second does short circuiting take place?
Reducing the gas source pressure to a constant working pressure
Minutes of elapsed time continually run (out of 10 minutes)
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
20 to 200 times per second

14. A pull type drive system is usually used on what type of material?
Aluminum wire
National Electrical Manufactures Association
The Arc voltage
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

15. Draw a typical volt amp curve for a machine that is designed for GMAW
Higher 26 to 35 arc volts
To prevent leakage - Carbon Dioxide (CO2)
If you dont know this check your phone
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

16. What is the recommended electrode stick- out for .035 solid 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
Wire feed speed
1/4 inch to 1/2 inch
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

17. When is the metal transferred with short circuit transfer?
Constant- speed wire feeders and Voltage- sennsing wire feeders
When the filler wire is in direct contract with the base metal
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
To prevent drawing of liquid CO2 (Carbon Dioxide)

18. List the three methods of metal transfer with GMAW
Wire feed speed - Voltage control
85%
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

19. What controls amperage when using GMAW?
Gas metal arc welding
Wire feed speed
Speed of the feed motor and - starting / stopping electrode feed
If you dont know this check your phone

20. In the GMAW process what does voltage control?
Cause flaking - which can clog the liner and contact tube
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Controls the rate of flow of a shielding gas to the gun nozzle
Puddle fluidity

21. What wire are knurled drive rolls most commonly used on?
Flux cored wires
Constant- speed wire feeders and Voltage- sennsing wire feeders
The resistace to electrical current flow increases with it. Causing the electrode to heat
Dry ice can form within the flow control openings and cause blockage of shielding gas

22. What is the required arc voltage used for short circuit transfer?
National Electrical Manufactures Association
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
12 to 22 arc volts
Gas metal arc welding

23. What is the purpose of the shielding gas used in GMAW?
5.8 to 12.5 L/min
The negative side of a welding unit
Shielding the molten weld metal from atmospheric contamination
Penetration and burn - off rate of the electrode

24. List several industries that would use GMAW
V groove or U groove
3
Pressure vessels and the piping industry
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field

25. When using flat drive rolls with too much pressure on copper coated solid wires what problem could take place?
Cause flaking - which can clog the liner and contact tube
Constant current (CC)
Gas metal arc welding
Pressure vessels and the piping industry

26. What does the abbreviation NEMA stand for?
National Electrical Manufactures Association
Gives arc voltage values to the control system of the feeder
Spatter problems and poor weld appearance
These terms are quite restrictive and often technically incorrect

27. List the factors that determine the mode of metal transfer
SMAW - GTAW
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
20 to 200 times per second
If you dont know this check your phone

28. What effect does increasing and decreasing the inductance have on the weld?
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
V groove or U groove
12 to 22 arc volts
To prevent leakage - Carbon Dioxide (CO2)

29. What is the maximum distance that hard wire can be successfully pushed?
Controls the rate of flow of a shielding gas to the gun nozzle
15 feet (4.5 meters)
Spatter problems and poor weld appearance
Wire feeds smoothly (yet will slip should a problem occur in the gun)

30. What happens when the electrode extension is increased?
The resistace to electrical current flow increases with it. Causing the electrode to heat
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
AWS and CSA

31. What is a typical flow rate of CO2 for short circuit transfer?
Constant voltage (CV)
5.8 to 12.5 L/min
National Electrical Manufactures Association
DCEP (Direct Current Electrode Positive) Reverse Polarity

32. What term is used to describe when the workpiece is hooked to the negative pole on the power source?
Wire feed speed
Welding process that joins metals by heating them with an electric arc
Guns
(DCEP) Direct Current Electrode Positive or Reverse polarity

33. What does voltage do in an electrical circuit?
Insufficient current to melt the wire off cleanly
Penetration and burn - off rate of the electrode
Voltage is the force that overcomes resistance to allow amperage flow
85%

34. What would be an indication that the drive roll pressure is adjusted correctly?
Controls the rate of flow of a shielding gas to the gun nozzle
Pressure - The rate of flow of a shielding gas
15 feet (4.5 meters)
Wire feeds smoothly (yet will slip should a problem occur in the gun)

35. What 2 organizations designate specifications for GMAW wires?
Duty cycle
AWS and CSA
Controls the rate of flow of a shielding gas to the gun nozzle
These terms are quite restrictive and often technically incorrect

36. Why must CO2 cylinders be used in the vertical position?
To prevent drawing of liquid CO2 (Carbon Dioxide)
To limit the short circuiting current so that spatter is reduced
Gas metal arc welding
Constant current (CC)

37. What is a solenoid valve and what actuates it?
Constant current (CC)
To prevent drawing of liquid CO2 (Carbon Dioxide)
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Duty cycle

38. A 10 minute cycle of welding time vs cooling time a given machine can handle.
Duty cycle
Insufficient current to melt the wire off cleanly
To prevent leakage - Carbon Dioxide (CO2)
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

39. Give a brief description of the GMAW process
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
Welding process that joins metals by heating them with an electric arc
Short- circuiting transfer - Globular transfer - Spray transfer

40. Why is a fiber washer required and what cylinder gas requires it?
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Pressure vessels and the piping industry
To prevent leakage - Carbon Dioxide (CO2)
(DCEP) Direct Current Electrode Positive or Reverse polarity

41. Why is a line heater required when using GMAW?
Minutes of elapsed time continually run (out of 10 minutes)
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Generally not as accurate
Dry ice can form within the flow control openings and cause blockage of shielding gas

42. How are GMAW guns rated?
Guns
Generally not as accurate
Constant voltage (CV)
By there current carrying capacity

43. What processes are constant current (CC) power sources designed to be used with?
SMAW - GTAW
V groove or U groove
Wire feed speed - Voltage control
Generally not as accurate

44. What does inductance control?
Shielding the molten weld metal from atmospheric contamination
The time rate of response for the current rise and fall
Welding process that joins metals by heating them with an electric arc
V groove or U groove

45. What is the reason glass 'tube' type flowmeters must have the tube mounted truly vertical?
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
Duty cycle

46. A machine with a 70% duty cycle can run at its max for 7 minutes with a cooling cycle of only _ minutes.
3
The Arc voltage
Spatter problems and poor weld appearance
Reducing the gas source pressure to a constant working pressure

47. List 3 forms compressed gases may be supplied for welding
SMAW - GTAW
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Cause flaking - which can clog the liner and contact tube
85%

48. What is an advantage of pulsed arc transfer with GMAW?
Guns
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
Spatter problems and poor weld appearance
...

49. What does the term GMAW identify?
Voltage is the force that overcomes resistance to allow amperage flow
20 to 200 times per second
Gas metal arc welding
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun

50. What is the main purpose of 'slope'?
AWS and CSA
Controls the rate of flow of a shielding gas to the gun nozzle
Speed of the feed motor and - starting / stopping electrode feed
To limit the short circuiting current so that spatter is reduced

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Gas Metal Arc Welding

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