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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?
National Electrical Manufactures Association
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Short- circuiting transfer - Globular transfer - Spray transfer

2. What would be an indication that the drive roll pressure is adjusted correctly?
Flux cored wires
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Wire feed speed
Gas metal arc welding

3. What is the effect of too much slope?
Short- circuiting transfer - Globular transfer - Spray transfer
Aluminum wire
To prevent drawing of liquid CO2 (Carbon Dioxide)
Insufficient current to melt the wire off cleanly

4. What is the recommended electrode stick- out for .035 solid wire?
1/4 inch to 1/2 inch
By there current carrying capacity
Wire feed speed
Controls the rate of flow of a shielding gas to the gun nozzle

5. Regulators control_____________ flowmeters SHOW____________.
Pressure - The rate of flow of a shielding gas
To limit the short circuiting current so that spatter is reduced
When the filler wire is in direct contract with the base metal
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

6. What are the 2 types of wire feeders available?
Reducing the gas source pressure to a constant working pressure
Minutes of elapsed time continually run (out of 10 minutes)
Welding process that joins metals by heating them with an electric arc
Constant- speed wire feeders and Voltage- sennsing wire feeders

7. What does the wire feeder control?
20 to 200 times per second
SMAW - GTAW
Speed of the feed motor and - starting / stopping electrode feed
Aluminum wire

8. What term is used to describe when the workpiece is hooked to the negative pole on the power source?
(DCEP) Direct Current Electrode Positive or Reverse polarity
12 to 22 arc volts
Higher 26 to 35 arc volts
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

9. What is the disadvantage of the gauge preset type of regulator/flowmeter?
Gas metal arc welding
Generally not as accurate
To prevent drawing of liquid CO2 (Carbon Dioxide)
SMAW - GTAW

10. What is a typical flow rate of CO2 for short circuit transfer?
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Generally not as accurate
5.8 to 12.5 L/min
Constant current (CC)

11. List 3 wire drive systems and give a short description of each
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
85%
AWS and CSA
Wire feed speed

12. What is the key advantage of short circuiting transfer?
Cause flaking - which can clog the liner and contact tube
Minimum distortion due to low heat input
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Constant- speed wire feeders and Voltage- sennsing wire feeders

13. List 3 forms compressed gases may be supplied for welding
V groove or U groove
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
AWS and CSA
Shielding the molten weld metal from atmospheric contamination

14. How many times per second does short circuiting take place?
Minutes of elapsed time continually run (out of 10 minutes)
20 to 200 times per second
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

15. What wire are knurled drive rolls most commonly used on?
These terms are quite restrictive and often technically incorrect
DCEP (Direct Current Electrode Positive) Reverse Polarity
Flux cored wires
15 feet (4.5 meters)

16. What is another term for electrode holders for GMAW?
5.8 to 12.5 L/min
Cause flaking - which can clog the liner and contact tube
Guns
If you dont know this check your phone

17. What is an advantage of pulsed arc transfer with GMAW?
The negative side of a welding unit
1/4 inch to 1/2 inch
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
National Electrical Manufactures Association

18. Draw a typical volt amp curve for a machine that is designed for GMAW
The negative side of a welding unit
20 to 200 times per second
By there current carrying capacity
If you dont know this check your phone

19. What does voltage do in an electrical circuit?
Voltage is the force that overcomes resistance to allow amperage flow
Shielding the molten weld metal from atmospheric contamination
Wire feed speed - Voltage control
Constant current (CC)

20. Why is globular transfer generally avoided with GMAW?
Minutes of elapsed time continually run (out of 10 minutes)
By there current carrying capacity
If you dont know this check your phone
Spatter problems and poor weld appearance

21. What effect does increasing and decreasing the inductance have on the weld?
Voltage is the force that overcomes resistance to allow amperage flow
Shielding the molten weld metal from atmospheric contamination
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts

22. When is the metal transferred with short circuit transfer?
When the filler wire is in direct contract with the base metal
Penetration and burn - off rate of the electrode
Pressure - The rate of flow of a shielding gas
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

23. What is the reason glass 'tube' type flowmeters must have the tube mounted truly vertical?
DCEP (Direct Current Electrode Positive) Reverse Polarity
...
Minutes of elapsed time continually run (out of 10 minutes)
Constant current (CC)

24. How are GMAW guns rated?
The resistace to electrical current flow increases with it. Causing the electrode to heat
By there current carrying capacity
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
To prevent leakage - Carbon Dioxide (CO2)

25. List several industries that would use GMAW
Shielding the molten weld metal from atmospheric contamination
Pressure vessels and the piping industry
Short- circuiting transfer - Globular transfer - Spray transfer
(DCEP) Direct Current Electrode Positive or Reverse polarity

26. What is the required arc voltage used for short circuit transfer?
The resistace to electrical current flow increases with it. Causing the electrode to heat
12 to 22 arc volts
Penetration and burn - off rate of the electrode
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts

27. List the factors that determine the mode of metal transfer
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
5.8 to 12.5 L/min
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Shielding the molten weld metal from atmospheric contamination

28. A machine with a 70% duty cycle can run at its max for 7 minutes with a cooling cycle of only _ minutes.
Pressure - The rate of flow of a shielding gas
If you dont know this check your phone
Gives arc voltage values to the control system of the feeder
3

29. What processes are constant current (CC) power sources designed to be used with?
5.8 to 12.5 L/min
Minutes of elapsed time continually run (out of 10 minutes)
SMAW - GTAW
Flux cored wires

30. List the three methods of metal transfer with GMAW
Dry ice can form within the flow control openings and cause blockage of shielding gas
The time rate of response for the current rise and fall
Short- circuiting transfer - Globular transfer - Spray transfer
Pressure vessels and the piping industry

31. What power sources are used with the GMAW Process?
The Arc voltage
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Shielding the molten weld metal from atmospheric contamination
Motor driven generators - Transformer rectifiers - and Inverter designs

32. A pull type drive system is usually used on what type of material?
National Electrical Manufactures Association
These terms are quite restrictive and often technically incorrect
By there current carrying capacity
Aluminum wire

33. What happens when the electrode extension is increased?
If you dont know this check your phone
SMAW - GTAW
The resistace to electrical current flow increases with it. Causing the electrode to heat
Pressure - The rate of flow of a shielding gas

34. Give a description of 'pinch effect'
Insufficient current to melt the wire off cleanly
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
National Electrical Manufactures Association
To prevent drawing of liquid CO2 (Carbon Dioxide)

35. What is the purpose of a regulator and what does it indicate on its gauges?
If you dont know this check your phone
To prevent drawing of liquid CO2 (Carbon Dioxide)
Reducing the gas source pressure to a constant working pressure
Motor driven generators - Transformer rectifiers - and Inverter designs

36. A 10 minute cycle of welding time vs cooling time a given machine can handle.
The negative side of a welding unit
Duty cycle
Cause flaking - which can clog the liner and contact tube
V groove or U groove

37. Draw a typical volt/amp curve that would be found with a power source designed for SMAW or GTAW
85%
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
If you dont know this check your phone
1/4 inch to 1/2 inch

38. What 2 controls are found on a GMAW set- up?
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Minutes of elapsed time continually run (out of 10 minutes)
When the filler wire is in direct contract with the base metal
Wire feed speed - Voltage control

39. In the GMAW process what does voltage control?
Puddle fluidity
Spatter problems and poor weld appearance
To prevent drawing of liquid CO2 (Carbon Dioxide)
Constant current (CC)

40. What output on the welding machine is used to rate the duty cycle?
Minutes of elapsed time continually run (out of 10 minutes)
Puddle fluidity
15 feet (4.5 meters)
To prevent leakage - Carbon Dioxide (CO2)

41. What is the purpose of the shielding gas used in GMAW?
Wire feeds smoothly (yet will slip should a problem occur in the gun)
The time rate of response for the current rise and fall
Shielding the molten weld metal from atmospheric contamination
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

42. What is the preferred drive roll design for solid wires?
Constant- speed wire feeders and Voltage- sennsing wire feeders
Motor driven generators - Transformer rectifiers - and Inverter designs
Pressure - The rate of flow of a shielding gas
V groove or U groove

43. What is the purpose of the pick- up lead on a voltage sensing wire feeder?
Short- circuiting transfer - Globular transfer - Spray transfer
The time rate of response for the current rise and fall
Wire feed speed - Voltage control
Gives arc voltage values to the control system of the feeder

44. When using flat drive rolls with too much pressure on copper coated solid wires what problem could take place?
5.8 to 12.5 L/min
These terms are quite restrictive and often technically incorrect
The negative side of a welding unit
Cause flaking - which can clog the liner and contact tube

45. What does a flowmeter do and what does it measure?
Controls the rate of flow of a shielding gas to the gun nozzle
Pressure vessels and the piping industry
Motor driven generators - Transformer rectifiers - and Inverter designs
5.8 to 12.5 L/min

46. What 2 organizations designate specifications for GMAW wires?
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
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
Puddle fluidity
AWS and CSA

47. What does the term GMAW identify?
Generally not as accurate
5.8 to 12.5 L/min
20 to 200 times per second
Gas metal arc welding

48. Is the arc voltage for spray transfer higher or lower than that used for short circuit transfer?
Higher 26 to 35 arc volts
Shielding the molten weld metal from atmospheric contamination
To limit the short circuiting current so that spatter is reduced
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun

49. What type of power source is used with a constant speed wire feeder?
Shielding the molten weld metal from atmospheric contamination
AWS and CSA
Voltage is the force that overcomes resistance to allow amperage flow
Constant voltage (CV)

50. What is the minimum % value of argon that must be present to use the spray transfer method of GMAW?
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
85%
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts

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Gas Metal Arc Welding

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