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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 effect does increasing and decreasing the inductance have on the weld?
Penetration and burn - off rate of the electrode
Constant voltage (CV)
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
5.8 to 12.5 L/min

2. What is the purpose of a regulator and what does it indicate on its gauges?
12 to 22 arc volts
Reducing the gas source pressure to a constant working pressure
Minimum distortion due to low heat input
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

3. What power sources are used with the GMAW Process?
...
AWS and CSA
SMAW - GTAW
Motor driven generators - Transformer rectifiers - and Inverter designs

4. What is the recommended electrode stick- out for .035 solid wire?
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
DCEP (Direct Current Electrode Positive) Reverse Polarity
3
1/4 inch to 1/2 inch

5. A pull type drive system is usually used on what type of material?
To prevent drawing of liquid CO2 (Carbon Dioxide)
Cause flaking - which can clog the liner and contact tube
Aluminum wire
...

6. What does the abbreviation NEMA stand for?
Voltage is the force that overcomes resistance to allow amperage flow
Pressure vessels and the piping industry
National Electrical Manufactures Association
Gas metal arc welding

7. Why is a fiber washer required and what cylinder gas requires it?
20 to 200 times per second
Gas metal arc welding
To prevent leakage - Carbon Dioxide (CO2)
AWS and CSA

8. What is the required arc voltage used for short circuit transfer?
12 to 22 arc volts
V groove or U groove
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Constant current (CC)

9. What is the effect of too much slope?
Minimum distortion due to low heat input
20 to 200 times per second
Speed of the feed motor and - starting / stopping electrode feed
Insufficient current to melt the wire off cleanly

10. A 10 minute cycle of welding time vs cooling time a given machine can handle.
Duty cycle
Constant voltage (CV)
Pressure - The rate of flow of a shielding gas
Short- circuiting transfer - Globular transfer - Spray transfer

11. What is a solenoid valve and what actuates it?
V groove or U groove
DCEP (Direct Current Electrode Positive) Reverse Polarity
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun

12. Why is a line heater required when using GMAW?
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
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Wire feed speed - Voltage control

13. List 3 wire drive systems and give a short description of each
If you dont know this check your phone
Shielding the molten weld metal from atmospheric contamination
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

14. What 2 organizations designate specifications for GMAW wires?
AWS and CSA
Gas metal arc welding
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Dry ice can form within the flow control openings and cause blockage of shielding gas

15. 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
Controls the rate of flow of a shielding gas to the gun nozzle
Cause flaking - which can clog the liner and contact tube

16. What does inductance control?
Wire feeds smoothly (yet will slip should a problem occur in the gun)
V groove or U groove
The time rate of response for the current rise and fall
Voltage is the force that overcomes resistance to allow amperage flow

17. What is a typical flow rate of CO2 for short circuit transfer?
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
3
5.8 to 12.5 L/min

18. In the GMAW process what does amperage control?
Penetration and burn - off rate of the electrode
Generally not as accurate
15 feet (4.5 meters)
To prevent drawing of liquid CO2 (Carbon Dioxide)

19. How many times per second does short circuiting take place?
Insufficient current to melt the wire off cleanly
Pressure - The rate of flow of a shielding gas
20 to 200 times per second
The Arc voltage

20. What does voltage do in an electrical circuit?
1/4 inch to 1/2 inch
Voltage is the force that overcomes resistance to allow amperage flow
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Gives arc voltage values to the control system of the feeder

21. What is another term for electrode holders for GMAW?
By there current carrying capacity
Minimum distortion due to low heat input
Guns
85%

22. What is an advantage of pulsed arc transfer with GMAW?
If you dont know this check your phone
Short- circuiting transfer - Globular transfer - Spray transfer
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
Gas metal arc welding

23. What controls amperage when using GMAW?
Gives arc voltage values to the control system of the feeder
Constant- speed wire feeders and Voltage- sennsing wire feeders
Wire feed speed
These terms are quite restrictive and often technically incorrect

24. What controls the wire speed on a voltage sensing wire feeder?
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
To limit the short circuiting current so that spatter is reduced
Welding process that joins metals by heating them with an electric arc
The Arc voltage

25. What is the main purpose of 'slope'?
To limit the short circuiting current so that spatter is reduced
Pressure vessels and the piping industry
SMAW - GTAW
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld

26. What does a flowmeter do and what does it measure?
Speed of the feed motor and - starting / stopping electrode feed
Gives arc voltage values to the control system of the feeder
Controls the rate of flow of a shielding gas to the gun nozzle
The Arc voltage

27. List several industries that would use GMAW
Short- circuiting transfer - Globular transfer - Spray transfer
Pressure vessels and the piping industry
...
(DCEP) Direct Current Electrode Positive or Reverse polarity

28. List 3 forms compressed gases may be supplied for welding
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
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Puddle fluidity

29. What current and polarity is generally used with GMAW?
DCEP (Direct Current Electrode Positive) Reverse Polarity
AWS and CSA
If you dont know this check your phone
Gas metal arc welding

30. What does the wire feeder control?
Gas metal arc welding
SMAW - GTAW
Speed of the feed motor and - starting / stopping electrode feed
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. When using flat drive rolls with too much pressure on copper coated solid wires what problem could take place?
15 feet (4.5 meters)
Cause flaking - which can clog the liner and contact tube
Controls the rate of flow of a shielding gas to the gun nozzle
Constant- speed wire feeders and Voltage- sennsing wire feeders

32. What term is used to describe when the workpiece is hooked to the negative pole on the power source?
5.8 to 12.5 L/min
(DCEP) Direct Current Electrode Positive or Reverse polarity
When the filler wire is in direct contract with the base metal
Puddle fluidity

33. How are GMAW guns rated?
Speed of the feed motor and - starting / stopping electrode feed
Penetration and burn - off rate of the electrode
By there current carrying capacity
Shielding the molten weld metal from atmospheric contamination

34. What would be an indication that the drive roll pressure is adjusted correctly?
Gas metal arc welding
Constant current (CC)
Controls the rate of flow of a shielding gas to the gun nozzle
Wire feeds smoothly (yet will slip should a problem occur in the gun)

35. What processes are constant current (CC) power sources designed to be used with?
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Spatter problems and poor weld appearance
SMAW - GTAW

36. Give a brief description of the GMAW process
These terms are quite restrictive and often technically incorrect
Wire feed speed - Voltage control
Welding process that joins metals by heating them with an electric arc
Guns

37. What happens when the electrode extension is increased?
The resistace to electrical current flow increases with it. Causing the electrode to heat
These terms are quite restrictive and often technically incorrect
Welding process that joins metals by heating them with an electric arc
AWS and CSA

38. What is the minimum % value of argon that must be present to use the spray transfer method of GMAW?
Speed of the feed motor and - starting / stopping electrode feed
85%
(DCEP) Direct Current Electrode Positive or Reverse polarity
When the filler wire is in direct contract with the base metal

39. With straight polarity where is 2/3 of the arc energy?
The negative side of a welding unit
Voltage is the force that overcomes resistance to allow amperage flow
Duty cycle
Minimum distortion due to low heat input

40. Is the arc voltage for spray transfer higher or lower than that used for short circuit transfer?
If you dont know this check your phone
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Higher 26 to 35 arc volts
Constant current (CC)

41. What is the purpose of the shielding gas used in GMAW?
Flux cored wires
(DCEP) Direct Current Electrode Positive or Reverse polarity
V groove or U groove
Shielding the molten weld metal from atmospheric contamination

42. In the GMAW process what does voltage control?
SMAW - GTAW
Insufficient current to melt the wire off cleanly
These terms are quite restrictive and often technically incorrect
Puddle fluidity

43. A machine with a 70% duty cycle can run at its max for 7 minutes with a cooling cycle of only _ minutes.
Minutes of elapsed time continually run (out of 10 minutes)
3
National Electrical Manufactures Association
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

44. What 2 controls are found on a GMAW set- up?
The negative side of a welding unit
Wire feed speed - Voltage control
Constant current (CC)
Controls the rate of flow of a shielding gas to the gun nozzle

45. List the factors that determine the mode of metal transfer
Wire feed speed - Voltage control
If you dont know this check your phone
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld

46. What does the term GMAW identify?
85%
Gas metal arc welding
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
DCEP (Direct Current Electrode Positive) Reverse Polarity

47. What output on the welding machine is used to rate the duty cycle?
85%
Minutes of elapsed time continually run (out of 10 minutes)
SMAW - GTAW
The time rate of response for the current rise and fall

48. What is the key advantage of short circuiting transfer?
Minimum distortion due to low heat input
Aluminum wire
Welding process that joins metals by heating them with an electric arc
The time rate of response for the current rise and fall

49. What type of power source is commonly used with a voltage sensing wire feeder?
Constant current (CC)
Minimum distortion due to low heat input
Motor driven generators - Transformer rectifiers - and Inverter designs
The negative side of a welding unit

50. Why is the term GMAW preferred over MIG or MAG?
Wire feed speed - Voltage control
Higher 26 to 35 arc volts
These terms are quite restrictive and often technically incorrect
The time rate of response for the current rise and fall

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Gas Metal Arc Welding

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