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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 term GMAW identify?
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
3
Gas metal arc welding
Wire feed speed

2. How are GMAW guns rated?
Welding process that joins metals by heating them with an electric arc
The negative side of a welding unit
By there current carrying capacity
Motor driven generators - Transformer rectifiers - and Inverter designs

3. What does the wire feeder control?
Speed of the feed motor and - starting / stopping electrode feed
Motor driven generators - Transformer rectifiers - and Inverter designs
If you dont know this check your phone
To prevent drawing of liquid CO2 (Carbon Dioxide)

4. What current and polarity is generally used with GMAW?
To prevent leakage - Carbon Dioxide (CO2)
Constant voltage (CV)
DCEP (Direct Current Electrode Positive) Reverse Polarity
Motor driven generators - Transformer rectifiers - and Inverter designs

5. What 2 controls are found on a GMAW set- up?
Wire feed speed - Voltage control
If you dont know this check your phone
The time rate of response for the current rise and fall
20 to 200 times per second

6. Regulators control_____________ flowmeters SHOW____________.
Pressure - The rate of flow of a shielding gas
Short- circuiting transfer - Globular transfer - Spray transfer
Cause flaking - which can clog the liner and contact tube
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

7. In the GMAW process what does amperage control?
Penetration and burn - off rate of the electrode
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Flux cored wires
Spatter problems and poor weld appearance

8. What are the 2 types of wire feeders available?
20 to 200 times per second
Welding process that joins metals by heating them with an electric arc
Minimum distortion due to low heat input
Constant- speed wire feeders and Voltage- sennsing wire feeders

9. What is the maximum distance that hard wire can be successfully pushed?
15 feet (4.5 meters)
Controls the rate of flow of a shielding gas to the gun nozzle
DCEP (Direct Current Electrode Positive) Reverse Polarity
Cause flaking - which can clog the liner and contact tube

10. What is the required arc voltage used for short circuit transfer?
National Electrical Manufactures Association
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
12 to 22 arc volts
AWS and CSA

11. What is the recommended electrode stick- out for .035 solid wire?
1/4 inch to 1/2 inch
Flux cored wires
To prevent leakage - Carbon Dioxide (CO2)
Short- circuiting transfer - Globular transfer - Spray transfer

12. Why is a fiber washer required and what cylinder gas requires it?
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Motor driven generators - Transformer rectifiers - and Inverter designs
Duty cycle
To prevent leakage - Carbon Dioxide (CO2)

13. What 2 organizations designate specifications for GMAW wires?
Cause flaking - which can clog the liner and contact tube
AWS and CSA
Generally not as accurate
The time rate of response for the current rise and fall

14. What is the minimum % value of argon that must be present to use the spray transfer method of GMAW?
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
Aluminum wire
Wire feeds smoothly (yet will slip should a problem occur in the gun)

15. When is the metal transferred with short circuit transfer?
12 to 22 arc volts
When the filler wire is in direct contract with the base metal
Duty cycle
Gives arc voltage values to the control system of the feeder

16. What is the key advantage of short circuiting transfer?
Minimum distortion due to low heat input
Shielding the molten weld metal from atmospheric contamination
Speed of the feed motor and - starting / stopping electrode feed
Puddle fluidity

17. Give a brief description of the GMAW process
The Arc voltage
To prevent drawing of liquid CO2 (Carbon Dioxide)
Welding process that joins metals by heating them with an electric arc
Cause flaking - which can clog the liner and contact tube

18. Why is the term GMAW preferred over MIG or MAG?
These terms are quite restrictive and often technically incorrect
Spatter problems and poor weld appearance
If you dont know this check your phone
Minutes of elapsed time continually run (out of 10 minutes)

19. Why is a line heater required when using GMAW?
Aluminum wire
Short- circuiting transfer - Globular transfer - Spray transfer
Motor driven generators - Transformer rectifiers - and Inverter designs
Dry ice can form within the flow control openings and cause blockage of shielding gas

20. When using flat drive rolls with too much pressure on copper coated solid wires what problem could take place?
SMAW - GTAW
Minimum distortion due to low heat input
Cause flaking - which can clog the liner and contact tube
Generally not as accurate

21. A pull type drive system is usually used on what type of material?
Spatter problems and poor weld appearance
If you dont know this check your phone
DCEP (Direct Current Electrode Positive) Reverse Polarity
Aluminum wire

22. What power sources are used with the GMAW Process?
Motor driven generators - Transformer rectifiers - and Inverter designs
The time rate of response for the current rise and fall
Controls the rate of flow of a shielding gas to the gun nozzle
By there current carrying capacity

23. What does voltage do in an electrical circuit?
Constant current (CC)
Voltage is the force that overcomes resistance to allow amperage flow
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

24. 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
These terms are quite restrictive and often technically incorrect
Gives arc voltage values to the control system of the feeder
15 feet (4.5 meters)

25. List several industries that would use GMAW
Pressure - The rate of flow of a shielding gas
Pressure vessels and the piping industry
Flux cored wires
Gas metal arc welding

26. What is the purpose of the shielding gas used in GMAW?
...
Wire feed speed - Voltage control
Shielding the molten weld metal from atmospheric contamination
To limit the short circuiting current so that spatter is reduced

27. What happens when the electrode extension is increased?
The resistace to electrical current flow increases with it. Causing the electrode to heat
Higher 26 to 35 arc volts
Constant current (CC)
Short- circuiting transfer - Globular transfer - Spray transfer

28. Why is globular transfer generally avoided with GMAW?
Motor driven generators - Transformer rectifiers - and Inverter designs
(DCEP) Direct Current Electrode Positive or Reverse polarity
Spatter problems and poor weld appearance
Dry ice can form within the flow control openings and cause blockage of shielding gas

29. List 3 forms compressed gases may be supplied for welding
(DCEP) Direct Current Electrode Positive or Reverse polarity
Gas metal arc welding
Puddle fluidity
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

30. What is the effect of too much slope?
The negative side of a welding unit
Gives arc voltage values to the control system of the feeder
Insufficient current to melt the wire off cleanly
3

31. List the factors that determine the mode of metal transfer
If you dont know this check your phone
The Arc voltage
Guns
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld

32. List the basic equipment requirements for the GMAW process
Minimum distortion due to low heat input
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
The time rate of response for the current rise and fall

33. What is the purpose of a regulator and what does it indicate on its gauges?
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Reducing the gas source pressure to a constant working pressure
Wire feeds smoothly (yet will slip should a problem occur in the gun)
National Electrical Manufactures Association

34. What is the disadvantage of the gauge preset type of regulator/flowmeter?
To prevent leakage - Carbon Dioxide (CO2)
AWS and CSA
Gas metal arc welding
Generally not as accurate

35. What is another term for electrode holders for GMAW?
Motor driven generators - Transformer rectifiers - and Inverter designs
Guns
5.8 to 12.5 L/min
When the filler wire is in direct contract with the base metal

36. Give a description of 'pinch effect'
Generally not as accurate
The time rate of response for the current rise and fall
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field

37. What is a solenoid valve and what actuates it?
Gives arc voltage values to the control system of the feeder
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
Wire feed speed

38. What output on the welding machine is used to rate the duty cycle?
Minutes of elapsed time continually run (out of 10 minutes)
Penetration and burn - off rate of the electrode
Wire feeds smoothly (yet will slip should a problem occur in the gun)
20 to 200 times per second

39. What type of power source is commonly used with a voltage sensing wire feeder?
Constant current (CC)
Higher 26 to 35 arc volts
Puddle fluidity
To prevent drawing of liquid CO2 (Carbon Dioxide)

40. With straight polarity where is 2/3 of the arc energy?
The negative side of a welding unit
National Electrical Manufactures Association
AWS and CSA
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

41. How many times per second does short circuiting take place?
20 to 200 times per second
15 feet (4.5 meters)
Higher 26 to 35 arc volts
5.8 to 12.5 L/min

42. List the three methods of metal transfer with GMAW
Short- circuiting transfer - Globular transfer - Spray transfer
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
The Arc voltage
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

43. What type of power source is used with a constant speed wire feeder?
(DCEP) Direct Current Electrode Positive or Reverse polarity
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Constant voltage (CV)
SMAW - GTAW

44. A 10 minute cycle of welding time vs cooling time a given machine can handle.
Duty cycle
Dry ice can form within the flow control openings and cause blockage of shielding gas
15 feet (4.5 meters)
Aluminum wire

45. Draw a typical volt amp curve for a machine that is designed for GMAW
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
Controls the rate of flow of a shielding gas to the gun nozzle
Higher 26 to 35 arc volts
If you dont know this check your phone

46. In the GMAW process what does voltage control?
Motor driven generators - Transformer rectifiers - and Inverter designs
To prevent drawing of liquid CO2 (Carbon Dioxide)
V groove or U groove
Puddle fluidity

47. What does inductance control?
Welding process that joins metals by heating them with an electric arc
The negative side of a welding unit
The time rate of response for the current rise and fall
Gas metal arc welding

48. What wire are knurled drive rolls most commonly used on?
Higher 26 to 35 arc volts
Pressure - The rate of flow of a shielding gas
The time rate of response for the current rise and fall
Flux cored wires

49. What is an advantage of pulsed arc transfer with GMAW?
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
20 to 200 times per second
...
If you dont know this check your phone

50. What is the purpose of the pick- up lead on a voltage sensing wire feeder?
Gives arc voltage values to the control system of the feeder
Wire feed speed
15 feet (4.5 meters)
Welding process that joins metals by heating them with an electric arc

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Gas Metal Arc Welding

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