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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?
Gas metal arc welding
National Electrical Manufactures Association
Short- circuiting transfer - Globular transfer - Spray transfer
Voltage is the force that overcomes resistance to allow amperage flow

2. What output on the welding machine is used to rate the duty cycle?
Gas metal arc welding
If you dont know this check your phone
V groove or U groove
Minutes of elapsed time continually run (out of 10 minutes)

3. What is the preferred drive roll design for solid wires?
Minimum distortion due to low heat input
V groove or U groove
Cause flaking - which can clog the liner and contact tube
National Electrical Manufactures Association

4. What controls the wire speed on a voltage sensing wire feeder?
Voltage is the force that overcomes resistance to allow amperage flow
Puddle fluidity
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
The Arc voltage

5. What does the abbreviation NEMA stand for?
National Electrical Manufactures Association
Spatter problems and poor weld appearance
Welding process that joins metals by heating them with an electric arc
...

6. What would be an indication that the drive roll pressure is adjusted correctly?
(DCEP) Direct Current Electrode Positive or Reverse polarity
National Electrical Manufactures Association
Wire feeds smoothly (yet will slip should a problem occur in the gun)
To prevent leakage - Carbon Dioxide (CO2)

7. What type of power source is commonly used with a voltage sensing wire feeder?
Gas metal arc welding
Constant current (CC)
Duty cycle
AWS and CSA

8. What power sources are used with the GMAW Process?
Higher 26 to 35 arc volts
Minutes of elapsed time continually run (out of 10 minutes)
DCEP (Direct Current Electrode Positive) Reverse Polarity
Motor driven generators - Transformer rectifiers - and Inverter designs

9. What is the maximum distance that hard wire can be successfully pushed?
15 feet (4.5 meters)
Constant- speed wire feeders and Voltage- sennsing wire feeders
DCEP (Direct Current Electrode Positive) Reverse Polarity
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld

10. List the basic equipment requirements for the GMAW process
Insufficient current to melt the wire off cleanly
Wire feed speed - Voltage control
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

11. What does the wire feeder control?
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
Penetration and burn - off rate of the electrode
Speed of the feed motor and - starting / stopping electrode feed

12. What processes are constant current (CC) power sources designed to be used with?
Penetration and burn - off rate of the electrode
The Arc voltage
Constant voltage (CV)
SMAW - GTAW

13. What type of power source is used with a constant speed wire feeder?
Constant voltage (CV)
Guns
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
Voltage is the force that overcomes resistance to allow amperage flow

14. Why must CO2 cylinders be used in the vertical position?
Insufficient current to melt the wire off cleanly
To prevent drawing of liquid CO2 (Carbon Dioxide)
Short- circuiting transfer - Globular transfer - Spray transfer
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts

15. What is the required arc voltage used for short circuit transfer?
Gives arc voltage values to the control system of the feeder
The resistace to electrical current flow increases with it. Causing the electrode to heat
12 to 22 arc volts
Welding process that joins metals by heating them with an electric arc

16. Give a description of 'pinch effect'
Controls the rate of flow of a shielding gas to the gun nozzle
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
If you dont know this check your phone
Constant- speed wire feeders and Voltage- sennsing wire feeders

17. In the GMAW process what does amperage control?
National Electrical Manufactures Association
Penetration and burn - off rate of the electrode
20 to 200 times per second
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field

18. A 10 minute cycle of welding time vs cooling time a given machine can handle.
Flux cored wires
Pressure - The rate of flow of a shielding gas
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Duty cycle

19. What does a flowmeter do and what does it measure?
Aluminum wire
Spatter problems and poor weld appearance
Controls the rate of flow of a shielding gas to the gun nozzle
(DCEP) Direct Current Electrode Positive or Reverse polarity

20. What are the 2 types of wire feeders available?
Voltage is the force that overcomes resistance to allow amperage flow
Constant- speed wire feeders and Voltage- sennsing wire feeders
Cause flaking - which can clog the liner and contact tube
AWS and CSA

21. What effect does increasing and decreasing the inductance have on the weld?
Wire feed speed
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Insufficient current to melt the wire off cleanly

22. What does voltage do in an electrical circuit?
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Voltage is the force that overcomes resistance to allow amperage flow
Guns
SMAW - GTAW

23. What term is used to describe when the workpiece is hooked to the negative pole on the power source?
Duty cycle
(DCEP) Direct Current Electrode Positive or Reverse polarity
...
Spatter problems and poor weld appearance

24. What does inductance control?
Gives arc voltage values to the control system of the feeder
DCEP (Direct Current Electrode Positive) Reverse Polarity
Flux cored wires
The time rate of response for the current rise and fall

25. What controls amperage when using GMAW?
Gas metal arc welding
SMAW - GTAW
These terms are quite restrictive and often technically incorrect
Wire feed speed

26. How many times per second does short circuiting take place?
Pressure - The rate of flow of a shielding gas
Wire feed speed - Voltage control
20 to 200 times per second
Insufficient current to melt the wire off cleanly

27. List 3 wire drive systems and give a short description of each
Pressure vessels and the piping industry
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
Welding process that joins metals by heating them with an electric arc
Guns

28. What is another term for electrode holders for GMAW?
Spatter problems and poor weld appearance
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 - Voltage control
Guns

29. When is the metal transferred with short circuit transfer?
15 feet (4.5 meters)
Guns
When the filler wire is in direct contract with the base metal
These terms are quite restrictive and often technically incorrect

30. Why is globular transfer generally avoided with GMAW?
3
Minimum distortion due to low heat input
SMAW - GTAW
Spatter problems and poor weld appearance

31. 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
By there current carrying capacity
DCEP (Direct Current Electrode Positive) Reverse Polarity

32. A pull type drive system is usually used on what type of material?
5.8 to 12.5 L/min
To prevent drawing of liquid CO2 (Carbon Dioxide)
...
Aluminum wire

33. What is the effect of too much slope?
The resistace to electrical current flow increases with it. Causing the electrode to heat
(DCEP) Direct Current Electrode Positive or Reverse polarity
Insufficient current to melt the wire off cleanly
Speed of the feed motor and - starting / stopping electrode feed

34. What is a solenoid valve and what actuates it?
Gives arc voltage values to the control system of the feeder
Cause flaking - which can clog the liner and contact tube
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Constant- speed wire feeders and Voltage- sennsing wire feeders

35. List the three methods of metal transfer with GMAW
12 to 22 arc volts
Generally not as accurate
Short- circuiting transfer - Globular transfer - Spray transfer
Constant- speed wire feeders and Voltage- sennsing wire feeders

36. What 2 organizations designate specifications for GMAW wires?
Gives arc voltage values to the control system of the feeder
V groove or U groove
Higher 26 to 35 arc volts
AWS and CSA

37. What is the purpose of a regulator and what does it indicate on its gauges?
1/4 inch to 1/2 inch
Shielding the molten weld metal from atmospheric contamination
Reducing the gas source pressure to a constant working pressure
When the filler wire is in direct contract with the base metal

38. What is the purpose of the shielding gas used in GMAW?
Shielding the molten weld metal from atmospheric contamination
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
Short- circuiting transfer - Globular transfer - Spray transfer

39. In the GMAW process what does voltage control?
Puddle fluidity
National Electrical Manufactures Association
Welding process that joins metals by heating them with an electric arc
85%

40. Draw a typical volt amp curve for a machine that is designed for GMAW
Wire feed speed
Insufficient current to melt the wire off cleanly
By there current carrying capacity
If you dont know this check your phone

41. Is the arc voltage for spray transfer higher or lower than that used for short circuit transfer?
Higher 26 to 35 arc volts
The resistace to electrical current flow increases with it. Causing the electrode to heat
The negative side of a welding unit
Insufficient current to melt the wire off cleanly

42. What is the key advantage of short circuiting transfer?
Aluminum wire
Minimum distortion due to low heat input
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
20 to 200 times per second

43. List 3 forms compressed gases may be supplied for welding
Wire feed speed
Shielding the molten weld metal from atmospheric contamination
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
12 to 22 arc volts

44. What happens when the electrode extension is increased?
20 to 200 times per second
The resistace to electrical current flow increases with it. Causing the electrode to heat
1/4 inch to 1/2 inch
Voltage is the force that overcomes resistance to allow amperage flow

45. What is the reason glass 'tube' type flowmeters must have the tube mounted truly vertical?
...
If you dont know this check your phone
AWS and CSA
To limit the short circuiting current so that spatter is reduced

46. What current and polarity is generally used with GMAW?
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
DCEP (Direct Current Electrode Positive) Reverse Polarity
To limit the short circuiting current so that spatter is reduced
Dry ice can form within the flow control openings and cause blockage of shielding gas

47. Why is the term GMAW preferred over MIG or MAG?
The negative side of a welding unit
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
These terms are quite restrictive and often technically incorrect
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld

48. Give a brief description of the GMAW process
Aluminum wire
Welding process that joins metals by heating them with an electric arc
15 feet (4.5 meters)
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

49. When using flat drive rolls with too much pressure on copper coated solid wires what problem could take place?
By there current carrying capacity
Cause flaking - which can clog the liner and contact tube
Motor driven generators - Transformer rectifiers - and Inverter designs
Higher 26 to 35 arc volts

50. How are GMAW guns rated?
Guns
Pressure vessels and the piping industry
Puddle fluidity
By there current carrying capacity

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Gas Metal Arc Welding

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