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Gas Metal Arc Welding

Instructions:

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 is the purpose of the pick- up lead on a voltage sensing wire feeder?
Constant current (CC)
Flux cored wires
The resistace to electrical current flow increases with it. Causing the electrode to heat
Gives arc voltage values to the control system of the feeder

2. What does inductance control?
The time rate of response for the current rise and fall
These terms are quite restrictive and often technically incorrect
Generally not as accurate
Wire feed speed

3. What 2 controls are found on a GMAW set- up?
Duty cycle
The time rate of response for the current rise and fall
Wire feed speed - Voltage control
Shielding the molten weld metal from atmospheric contamination

4. What does the wire feeder control?
Duty cycle
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Speed of the feed motor and - starting / stopping electrode feed
Cause flaking - which can clog the liner and contact tube

5. With straight polarity where is 2/3 of the arc energy?
The negative side of a welding unit
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
15 feet (4.5 meters)

6. Why is the term GMAW preferred over MIG or MAG?
Short- circuiting transfer - Globular transfer - Spray transfer
1/4 inch to 1/2 inch
These terms are quite restrictive and often technically incorrect
National Electrical Manufactures Association

7. What are the 2 types of wire feeders available?
Gas metal arc welding
Constant- speed wire feeders and Voltage- sennsing wire feeders
Higher 26 to 35 arc volts
12 to 22 arc volts

8. How are GMAW guns rated?
Pressure - The rate of flow of a shielding gas
SMAW - GTAW
Reducing the gas source pressure to a constant working pressure
By there current carrying capacity

9. In the GMAW process what does voltage control?
Pressure vessels and the piping industry
Puddle fluidity
Minimum distortion due to low heat input
85%

10. Is the arc voltage for spray transfer higher or lower than that used for short circuit transfer?
5.8 to 12.5 L/min
Controls the rate of flow of a shielding gas to the gun nozzle
Puddle fluidity
Higher 26 to 35 arc volts

11. How many times per second does short circuiting take place?
20 to 200 times per second
The negative side of a welding unit
3
Higher 26 to 35 arc volts

12. What term is used to describe when the workpiece is hooked to the negative pole on the power source?
By there current carrying capacity
(DCEP) Direct Current Electrode Positive or Reverse polarity
Spatter problems and poor weld appearance
Constant current (CC)

13. Why is globular transfer generally avoided with GMAW?
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Constant voltage (CV)
15 feet (4.5 meters)
Spatter problems and poor weld appearance

14. What current and polarity is generally used with GMAW?
Gas metal arc welding
DCEP (Direct Current Electrode Positive) Reverse Polarity
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
If you dont know this check your phone

15. What would be an indication that the drive roll pressure is adjusted correctly?
Constant voltage (CV)
Generally not as accurate
Short- circuiting transfer - Globular transfer - Spray transfer
Wire feeds smoothly (yet will slip should a problem occur in the gun)

16. What is the maximum distance that hard wire can be successfully pushed?
Cause flaking - which can clog the liner and contact tube
85%
15 feet (4.5 meters)
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

17. 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
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Cause flaking - which can clog the liner and contact tube
By there current carrying capacity

18. What controls amperage when using GMAW?
Guns
Welding process that joins metals by heating them with an electric arc
Spatter problems and poor weld appearance
Wire feed speed

19. What wire are knurled drive rolls most commonly used on?
Flux cored wires
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)
The negative side of a welding unit

20. What is the disadvantage of the gauge preset type of regulator/flowmeter?
DCEP (Direct Current Electrode Positive) Reverse Polarity
Short- circuiting transfer - Globular transfer - Spray transfer
Generally not as accurate
Voltage is the force that overcomes resistance to allow amperage flow

21. What is the main purpose of 'slope'?
When the filler wire is in direct contract with the base metal
To limit the short circuiting current so that spatter is reduced
Aluminum wire
Pressure - The rate of flow of a shielding gas

22. What is the required arc voltage used for short circuit transfer?
Shielding the molten weld metal from atmospheric contamination
Gas metal arc welding
12 to 22 arc volts
V groove or U groove

23. What processes are constant current (CC) power sources designed to be used with?
Controls the rate of flow of a shielding gas to the gun nozzle
SMAW - GTAW
Pressure vessels and the piping industry
...

24. What is the reason glass 'tube' type flowmeters must have the tube mounted truly vertical?
...
Constant current (CC)
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Reducing the gas source pressure to a constant working pressure

25. Draw a typical volt amp curve for a machine that is designed for GMAW
If you dont know this check your phone
Constant voltage (CV)
Minutes of elapsed time continually run (out of 10 minutes)
Constant- speed wire feeders and Voltage- sennsing wire feeders

26. Give a description of 'pinch effect'
12 to 22 arc volts
Guns
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Speed of the feed motor and - starting / stopping electrode feed

27. What is the minimum % value of argon that must be present to use the spray transfer method of GMAW?
85%
Cause flaking - which can clog the liner and contact tube
5.8 to 12.5 L/min
To prevent drawing of liquid CO2 (Carbon Dioxide)

28. What is the effect of too much slope?
To prevent leakage - Carbon Dioxide (CO2)
Insufficient current to melt the wire off cleanly
Constant- speed wire feeders and Voltage- sennsing wire feeders
Guns

29. When is the metal transferred with short circuit transfer?
When the filler wire is in direct contract with the base metal
20 to 200 times per second
These terms are quite restrictive and often technically incorrect
To limit the short circuiting current so that spatter is reduced

30. What is a solenoid valve and what actuates it?
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Wire feed speed - Voltage control
The negative side of a welding unit
Constant voltage (CV)

31. Regulators control_____________ flowmeters SHOW____________.
Insufficient current to melt the wire off cleanly
85%
...
Pressure - The rate of flow of a shielding gas

32. What is the purpose of the shielding gas used in GMAW?
When the filler wire is in direct contract with the base metal
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Controls the rate of flow of a shielding gas to the gun nozzle
Shielding the molten weld metal from atmospheric contamination

33. A 10 minute cycle of welding time vs cooling time a given machine can handle.
Constant- speed wire feeders and Voltage- sennsing wire feeders
SMAW - GTAW
Duty cycle
Penetration and burn - off rate of the electrode

34. What is the key advantage of short circuiting transfer?
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Minimum distortion due to low heat input
...
Minutes of elapsed time continually run (out of 10 minutes)

35. What does the term GMAW identify?
If you dont know this check your phone
Gas metal arc welding
Controls the rate of flow of a shielding gas to the gun nozzle
V groove or U groove

36. A pull type drive system is usually used on what type of material?
SMAW - GTAW
20 to 200 times per second
Aluminum wire
These terms are quite restrictive and often technically incorrect

37. Why must CO2 cylinders be used in the vertical position?
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
To prevent drawing of liquid CO2 (Carbon Dioxide)
12 to 22 arc volts
Pressure - The rate of flow of a shielding gas

38. What power sources are used with the GMAW Process?
National Electrical Manufactures Association
Pressure - The rate of flow of a shielding gas
Motor driven generators - Transformer rectifiers - and Inverter designs
Wire feeds smoothly (yet will slip should a problem occur in the gun)

39. What does voltage do in an electrical circuit?
1/4 inch to 1/2 inch
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Voltage is the force that overcomes resistance to allow amperage flow
Wire feed speed

40. What is another term for electrode holders for GMAW?
DCEP (Direct Current Electrode Positive) Reverse Polarity
Guns
Pressure vessels and the piping industry
To prevent leakage - Carbon Dioxide (CO2)

41. What is the recommended electrode stick- out for .035 solid wire?
1/4 inch to 1/2 inch
AWS and CSA
Minutes of elapsed time continually run (out of 10 minutes)
Gas metal arc welding

42. A machine with a 70% duty cycle can run at its max for 7 minutes with a cooling cycle of only _ minutes.
3
The resistace to electrical current flow increases with it. Causing the electrode to heat
Constant voltage (CV)
Spatter problems and poor weld appearance

43. What is an advantage of pulsed arc transfer with GMAW?
(DCEP) Direct Current Electrode Positive or Reverse polarity
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
Puddle fluidity

44. List several industries that would use GMAW
Wire feed speed - Voltage control
Pressure vessels and the piping industry
The Arc voltage
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field

45. What is the purpose of a regulator and what does it indicate on its gauges?
The Arc voltage
Wire feed speed - Voltage control
Puddle fluidity
Reducing the gas source pressure to a constant working pressure

46. Why is a line heater required when using GMAW?
Motor driven generators - Transformer rectifiers - and Inverter designs
Dry ice can form within the flow control openings and cause blockage of shielding gas
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Duty cycle

47. List the factors that determine the mode of metal transfer
DCEP (Direct Current Electrode Positive) Reverse Polarity
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
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

48. What does a flowmeter do and what does it measure?
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
V groove or U groove
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

49. Draw a typical volt/amp curve that would be found with a power source designed for SMAW or GTAW
15 feet (4.5 meters)
If you dont know this check your phone
The time rate of response for the current rise and fall
Welding process that joins metals by heating them with an electric arc

50. List 3 wire drive systems and give a short description of each
Short- circuiting transfer - Globular transfer - Spray transfer
12 to 22 arc volts
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

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Gas Metal Arc Welding

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