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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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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What does voltage do in an electrical circuit?
When the filler wire is in direct contract with the base metal
Voltage is the force that overcomes resistance to allow amperage flow
Aluminum wire
Gives arc voltage values to the control system of the feeder

2. What does the wire feeder control?
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
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts

3. What does the term GMAW identify?
(DCEP) Direct Current Electrode Positive or Reverse polarity
Spatter problems and poor weld appearance
Minutes of elapsed time continually run (out of 10 minutes)
Gas metal arc welding

4. What processes are constant current (CC) power sources designed to be used with?
Dry ice can form within the flow control openings and cause blockage of shielding gas
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Reducing the gas source pressure to a constant working pressure
SMAW - GTAW

5. 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
3
These terms are quite restrictive and often technically incorrect
When the filler wire is in direct contract with the base metal

6. What is the reason glass 'tube' type flowmeters must have the tube mounted truly vertical?
(DCEP) Direct Current Electrode Positive or Reverse polarity
...
Flux cored wires
Wire feed speed

7. In the GMAW process what does voltage control?
Constant current (CC)
The Arc voltage
V groove or U groove
Puddle fluidity

8. What 2 controls are found on a GMAW set- up?
To prevent leakage - Carbon Dioxide (CO2)
These terms are quite restrictive and often technically incorrect
Dry ice can form within the flow control openings and cause blockage of shielding gas
Wire feed speed - Voltage control

9. What effect does increasing and decreasing the inductance have on the weld?
Constant current (CC)
Shielding the molten weld metal from atmospheric contamination
To prevent drawing of liquid CO2 (Carbon Dioxide)
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts

10. What type of power source is commonly used with a voltage sensing wire feeder?
Constant current (CC)
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
If you dont know this check your phone
Reducing the gas source pressure to a constant working pressure

11. List the three methods of metal transfer with GMAW
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
SMAW - GTAW
Generally not as accurate
Short- circuiting transfer - Globular transfer - Spray transfer

12. What does the abbreviation NEMA stand for?
When the filler wire is in direct contract with the base metal
Wire feed speed
Voltage is the force that overcomes resistance to allow amperage flow
National Electrical Manufactures Association

13. How are GMAW guns rated?
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
By there current carrying capacity
SMAW - GTAW
Speed of the feed motor and - starting / stopping electrode feed

14. What controls amperage when using GMAW?
(DCEP) Direct Current Electrode Positive or Reverse polarity
Wire feed speed
Dry ice can form within the flow control openings and cause blockage of shielding gas
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

15. Why is a line heater required when using GMAW?
Generally not as accurate
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Dry ice can form within the flow control openings and cause blockage of shielding gas
Pressure vessels and the piping industry

16. What power sources are used with the GMAW Process?
Motor driven generators - Transformer rectifiers - and Inverter designs
Speed of the feed motor and - starting / stopping electrode feed
Puddle fluidity
Guns

17. What is a typical flow rate of CO2 for short circuit transfer?
To limit the short circuiting current so that spatter is reduced
Guns
The resistace to electrical current flow increases with it. Causing the electrode to heat
5.8 to 12.5 L/min

18. Why is a fiber washer required and what cylinder gas requires it?
Constant current (CC)
To prevent leakage - Carbon Dioxide (CO2)
To limit the short circuiting current so that spatter is reduced
If you dont know this check your phone

19. Why must CO2 cylinders be used in the vertical position?
To prevent drawing of liquid CO2 (Carbon Dioxide)
If you dont know this check your phone
Short- circuiting transfer - Globular transfer - Spray transfer
Voltage is the force that overcomes resistance to allow amperage flow

20. What is the purpose of a regulator and what does it indicate on its gauges?
Reducing the gas source pressure to a constant working pressure
Constant current (CC)
When the filler wire is in direct contract with the base metal
Spatter problems and poor weld appearance

21. What would be an indication that the drive roll pressure is adjusted correctly?
1/4 inch to 1/2 inch
These terms are quite restrictive and often technically incorrect
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

22. What happens when the electrode extension is increased?
Reducing the gas source pressure to a constant working pressure
The resistace to electrical current flow increases with it. Causing the electrode to heat
Constant voltage (CV)
If you dont know this check your phone

23. In the GMAW process what does amperage control?
Higher 26 to 35 arc volts
Penetration and burn - off rate of the electrode
To prevent drawing of liquid CO2 (Carbon Dioxide)
12 to 22 arc volts

24. What is a solenoid valve and what actuates it?
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
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Duty cycle

25. Draw a typical volt/amp curve that would be found with a power source designed for SMAW or GTAW
Speed of the feed motor and - starting / stopping electrode feed
If you dont know this check your phone
12 to 22 arc volts
Puddle fluidity

26. A pull type drive system is usually used on what type of material?
Higher 26 to 35 arc volts
Wire feeds smoothly (yet will slip should a problem occur in the gun)
(DCEP) Direct Current Electrode Positive or Reverse polarity
Aluminum wire

27. What term is used to describe when the workpiece is hooked to the negative pole on the power source?
Voltage is the force that overcomes resistance to allow amperage flow
(DCEP) Direct Current Electrode Positive or Reverse polarity
Wire feed speed
Controls the rate of flow of a shielding gas to the gun nozzle

28. List the basic equipment requirements for the GMAW process
Guns
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Aluminum wire

29. What is the key advantage of short circuiting transfer?
Constant voltage (CV)
Minimum distortion due to low heat input
When the filler wire is in direct contract with the base metal
The Arc voltage

30. What wire are knurled drive rolls most commonly used on?
AWS and CSA
3
(DCEP) Direct Current Electrode Positive or Reverse polarity
Flux cored wires

31. What current and polarity is generally used with GMAW?
1/4 inch to 1/2 inch
These terms are quite restrictive and often technically incorrect
Penetration and burn - off rate of the electrode
DCEP (Direct Current Electrode Positive) Reverse Polarity

32. List the factors that determine the mode of metal transfer
Wire feed speed
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
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

33. What 2 organizations designate specifications for GMAW wires?
AWS and CSA
1/4 inch to 1/2 inch
12 to 22 arc volts
85%

34. What is the preferred drive roll design for solid wires?
3
V groove or U groove
Constant current (CC)
AWS and CSA

35. List 3 wire drive systems and give a short description of each
20 to 200 times per second
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
Higher 26 to 35 arc volts
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field

36. What type of power source is used with a constant speed wire feeder?
If you dont know this check your phone
Constant voltage (CV)
Gas metal arc welding
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field

37. What does inductance control?
SMAW - GTAW
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Voltage is the force that overcomes resistance to allow amperage flow
The time rate of response for the current rise and fall

38. Give a description of 'pinch effect'
Constant- speed wire feeders and Voltage- sennsing wire feeders
If you dont know this check your phone
Higher 26 to 35 arc volts
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field

39. What does a flowmeter do and what does it measure?
Constant- speed wire feeders and Voltage- sennsing wire feeders
SMAW - GTAW
Minutes of elapsed time continually run (out of 10 minutes)
Controls the rate of flow of a shielding gas to the gun nozzle

40. What is the purpose of the shielding gas used in GMAW?
Flux cored wires
By there current carrying capacity
Shielding the molten weld metal from atmospheric contamination
National Electrical Manufactures Association

41. What controls the wire speed on a voltage sensing wire feeder?
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
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

42. Draw a typical volt amp curve for a machine that is designed for GMAW
Flux cored wires
Duty cycle
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
If you dont know this check your phone

43. List several industries that would use GMAW
Constant current (CC)
Guns
National Electrical Manufactures Association
Pressure vessels and the piping industry

44. When is the metal transferred with short circuit transfer?
By there current carrying capacity
Minutes of elapsed time continually run (out of 10 minutes)
When the filler wire is in direct contract with the base metal
Gas metal arc welding

45. 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
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
National Electrical Manufactures Association
15 feet (4.5 meters)

46. What is another term for electrode holders for GMAW?
Guns
Higher 26 to 35 arc volts
20 to 200 times per second
...

47. Regulators control_____________ flowmeters SHOW____________.
...
Pressure - The rate of flow of a shielding gas
If you dont know this check your phone
Guns

48. How many times per second does short circuiting take place?
Duty cycle
SMAW - GTAW
20 to 200 times per second
These terms are quite restrictive and often technically incorrect

49. What is the recommended electrode stick- out for .035 solid wire?
20 to 200 times per second
Wire feed speed - Voltage control
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

50. 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
Aluminum wire
The negative side of a welding unit
Wire feeds smoothly (yet will slip should a problem occur in the gun)

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Gas Metal Arc Welding

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