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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 type of power source is commonly used with a voltage sensing wire feeder?
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Constant current (CC)
Wire feeds smoothly (yet will slip should a problem occur in the gun)

2. What is the key advantage of short circuiting transfer?
Wire feed speed - Voltage control
If you dont know this check your phone
3
Minimum distortion due to low heat input

3. What is another term for electrode holders for GMAW?
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Guns
Minutes of elapsed time continually run (out of 10 minutes)
Speed of the feed motor and - starting / stopping electrode feed

4. What power sources are used with the GMAW Process?
Generally not as accurate
Duty cycle
Minutes of elapsed time continually run (out of 10 minutes)
Motor driven generators - Transformer rectifiers - and Inverter designs

5. A pull type drive system is usually used on what type of material?
Welding process that joins metals by heating them with an electric arc
National Electrical Manufactures Association
Aluminum wire
Generally not as accurate

6. What controls the wire speed on a voltage sensing wire feeder?
Spatter problems and poor weld appearance
The Arc voltage
12 to 22 arc volts
Wire feed speed

7. List 3 forms compressed gases may be supplied for welding
Constant current (CC)
Spatter problems and poor weld appearance
The negative side of a welding unit
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

8. What is the purpose of the shielding gas used in GMAW?
Guns
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Shielding the molten weld metal from atmospheric contamination
Wire feeds smoothly (yet will slip should a problem occur in the gun)

9. How many times per second does short circuiting take place?
Penetration and burn - off rate of the electrode
The time rate of response for the current rise and fall
20 to 200 times per second
By there current carrying capacity

10. What 2 controls are found on a GMAW set- up?
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
Wire feed speed - Voltage control
Spatter problems and poor weld appearance

11. Give a brief description of the GMAW process
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
Duty cycle
Welding process that joins metals by heating them with an electric arc

12. What is the minimum % value of argon that must be present to use the spray transfer method of GMAW?
Spatter problems and poor weld appearance
Gives arc voltage values to the control system of the feeder
To prevent drawing of liquid CO2 (Carbon Dioxide)
85%

13. Why must CO2 cylinders be used in the vertical position?
(DCEP) Direct Current Electrode Positive or Reverse polarity
Wire feed speed - Voltage control
The resistace to electrical current flow increases with it. Causing the electrode to heat
To prevent drawing of liquid CO2 (Carbon Dioxide)

14. Is the arc voltage for spray transfer higher or lower than that used for short circuit transfer?
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Higher 26 to 35 arc volts
85%
Voltage is the force that overcomes resistance to allow amperage flow

15. With straight polarity where is 2/3 of the arc energy?
The negative side of a welding unit
(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
AWS and CSA

16. What does the term GMAW identify?
The time rate of response for the current rise and fall
Gas metal arc welding
...
1/4 inch to 1/2 inch

17. What happens when the electrode extension is increased?
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 - Voltage control
The resistace to electrical current flow increases with it. Causing the electrode to heat
When the filler wire is in direct contract with the base metal

18. What does voltage do in an electrical circuit?
The negative side of a welding unit
20 to 200 times per second
5.8 to 12.5 L/min
Voltage is the force that overcomes resistance to allow amperage flow

19. What current and polarity is generally used with GMAW?
Aluminum wire
DCEP (Direct Current Electrode Positive) Reverse Polarity
Motor driven generators - Transformer rectifiers - and Inverter designs
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

20. What does a flowmeter do and what does it measure?
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Constant current (CC)
Controls the rate of flow of a shielding gas to the gun nozzle
Pressure - The rate of flow of a shielding gas

21. When is the metal transferred with short circuit transfer?
Constant- speed wire feeders and Voltage- sennsing wire feeders
Wire feed speed - Voltage control
To prevent drawing of liquid CO2 (Carbon Dioxide)
When the filler wire is in direct contract with the base metal

22. What does the wire feeder control?
Speed of the feed motor and - starting / stopping electrode feed
12 to 22 arc volts
Duty cycle
Wire feed speed

23. List the three methods of metal transfer with GMAW
Short- circuiting transfer - Globular transfer - Spray transfer
(DCEP) Direct Current Electrode Positive or Reverse polarity
Pressure - The rate of flow of a shielding gas
15 feet (4.5 meters)

24. What output on the welding machine is used to rate the duty cycle?
Minutes of elapsed time continually run (out of 10 minutes)
By there current carrying capacity
Generally not as accurate
V groove or U groove

25. In the GMAW process what does voltage control?
If you dont know this check your phone
Puddle fluidity
Aluminum wire
Constant voltage (CV)

26. What is the maximum distance that hard wire can be successfully pushed?
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15 feet (4.5 meters)
Insufficient current to melt the wire off cleanly
Aluminum wire

27. Draw a typical volt amp curve for a machine that is designed for GMAW
Motor driven generators - Transformer rectifiers - and Inverter designs
Voltage is the force that overcomes resistance to allow amperage flow
Pressure vessels and the piping industry
If you dont know this check your phone

28. List the basic equipment requirements for the GMAW process
V groove or U groove
AWS and CSA
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

29. What is the main purpose of 'slope'?
Higher 26 to 35 arc volts
To limit the short circuiting current so that spatter is reduced
Minimum distortion due to low heat input
SMAW - GTAW

30. What is the recommended electrode stick- out for .035 solid wire?
5.8 to 12.5 L/min
15 feet (4.5 meters)
1/4 inch to 1/2 inch
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

31. Regulators control_____________ flowmeters SHOW____________.
The negative side of a welding unit
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

32. What is the disadvantage of the gauge preset type of regulator/flowmeter?
Cause flaking - which can clog the liner and contact tube
Higher 26 to 35 arc volts
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Generally not as accurate

33. 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
Wire feed speed
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
If you dont know this check your phone

34. 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
The Arc voltage
Shielding the molten weld metal from atmospheric contamination
Minutes of elapsed time continually run (out of 10 minutes)

35. Why is a fiber washer required and what cylinder gas requires it?
To prevent leakage - Carbon Dioxide (CO2)
Gives arc voltage values to the control system of the feeder
Flux cored wires
Aluminum wire

36. How are GMAW guns rated?
By there current carrying capacity
Constant- speed wire feeders and Voltage- sennsing wire feeders
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
Spatter problems and poor weld appearance

37. What processes are constant current (CC) power sources designed to be used with?
SMAW - GTAW
Higher 26 to 35 arc volts
Insufficient current to melt the wire off cleanly
Voltage is the force that overcomes resistance to allow amperage flow

38. What are the 2 types of wire feeders available?
Flux cored wires
Constant- speed wire feeders and Voltage- sennsing wire feeders
20 to 200 times per second
DCEP (Direct Current Electrode Positive) Reverse Polarity

39. What is a typical flow rate of CO2 for short circuit transfer?
To limit the short circuiting current so that spatter is reduced
Gas metal arc welding
5.8 to 12.5 L/min
Insufficient current to melt the wire off cleanly

40. 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
15 feet (4.5 meters)
...
12 to 22 arc volts

41. What is a solenoid valve and what actuates it?
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
Gives arc voltage values to the control system of the feeder
85%

42. A 10 minute cycle of welding time vs cooling time a given machine can handle.
Generally not as accurate
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
(DCEP) Direct Current Electrode Positive or Reverse polarity
Duty cycle

43. Why is the term GMAW preferred over MIG or MAG?
The negative side of a welding unit
Wire feed speed - Voltage control
These terms are quite restrictive and often technically incorrect
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

44. What 2 organizations designate specifications for GMAW wires?
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
If you dont know this check your phone
AWS and CSA

45. What does the abbreviation NEMA stand for?
Shielding the molten weld metal from atmospheric contamination
The negative side of a welding unit
National Electrical Manufactures Association
20 to 200 times per second

46. 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
Pressure - The rate of flow of a shielding gas
85%
AWS and CSA

47. What term is used to describe when the workpiece is hooked to the negative pole on the power source?
Pressure vessels and the piping industry
If you dont know this check your phone
To prevent leakage - Carbon Dioxide (CO2)
(DCEP) Direct Current Electrode Positive or Reverse polarity

48. What is the purpose of a regulator and what does it indicate on its gauges?
20 to 200 times per second
These terms are quite restrictive and often technically incorrect
To prevent drawing of liquid CO2 (Carbon Dioxide)
Reducing the gas source pressure to a constant working pressure

49. What controls amperage when using GMAW?
Penetration and burn - off rate of the electrode
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
Wire feed speed
Pressure vessels and the piping industry

50. List several industries that would use GMAW
Pressure vessels and the piping industry
Higher 26 to 35 arc volts
Short- circuiting transfer - Globular transfer - Spray transfer
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun

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Gas Metal Arc Welding

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