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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 would be an indication that the drive roll pressure is adjusted correctly?
V groove or U groove
85%
National Electrical Manufactures Association
Wire feeds smoothly (yet will slip should a problem occur in the gun)

2. List the basic equipment requirements for the GMAW process
AWS and CSA
Pressure vessels and the piping industry
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

3. Give a description of 'pinch effect'
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Wire feed speed
Generally not as accurate
Higher 26 to 35 arc volts

4. What does voltage do in an electrical circuit?
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
If you dont know this check your phone
Voltage is the force that overcomes resistance to allow amperage flow
National Electrical Manufactures Association

5. What is the main purpose of 'slope'?
Welding process that joins metals by heating them with an electric arc
To limit the short circuiting current so that spatter is reduced
Duty cycle
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field

6. List the factors that determine the mode of metal transfer
Duty cycle
By there current carrying capacity
Wire feed speed
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld

7. What term is used to describe when the workpiece is hooked to the negative pole on the power source?
The resistace to electrical current flow increases with it. Causing the electrode to heat
SMAW - GTAW
AWS and CSA
(DCEP) Direct Current Electrode Positive or Reverse polarity

8. Is the arc voltage for spray transfer higher or lower than that used for short circuit transfer?
Higher 26 to 35 arc volts
20 to 200 times per second
Gives arc voltage values to the control system of the feeder
Minimum distortion due to low heat input

9. List the three methods of metal transfer with GMAW
National Electrical Manufactures Association
(DCEP) Direct Current Electrode Positive or Reverse polarity
The Arc voltage
Short- circuiting transfer - Globular transfer - Spray transfer

10. What is the minimum % value of argon that must be present to use the spray transfer method of GMAW?
Pressure - The rate of flow of a shielding gas
Short- circuiting transfer - Globular transfer - Spray transfer
85%
Speed of the feed motor and - starting / stopping electrode feed

11. What is the maximum distance that hard wire can be successfully pushed?
Gives arc voltage values to the control system of the feeder
85%
15 feet (4.5 meters)
The negative side of a welding unit

12. What 2 organizations designate specifications for GMAW wires?
AWS and CSA
Constant current (CC)
3
Dry ice can form within the flow control openings and cause blockage of shielding gas

13. Why is a fiber washer required and what cylinder gas requires it?
Pressure - The rate of flow of a shielding gas
To prevent leakage - Carbon Dioxide (CO2)
Shielding the molten weld metal from atmospheric contamination
Duty cycle

14. Draw a typical volt amp curve for a machine that is designed for GMAW
Generally not as accurate
Cause flaking - which can clog the liner and contact tube
To limit the short circuiting current so that spatter is reduced
If you dont know this check your phone

15. Why is globular transfer generally avoided with GMAW?
Welding process that joins metals by heating them with an electric arc
The time rate of response for the current rise and fall
To prevent leakage - Carbon Dioxide (CO2)
Spatter problems and poor weld appearance

16. What processes are constant current (CC) power sources designed to be used with?
(DCEP) Direct Current Electrode Positive or Reverse polarity
5.8 to 12.5 L/min
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
SMAW - GTAW

17. What does inductance control?
The time rate of response for the current rise and fall
Guns
AWS and CSA
Speed of the feed motor and - starting / stopping electrode feed

18. What does the abbreviation NEMA stand for?
Pressure vessels and the piping industry
Short- circuiting transfer - Globular transfer - Spray transfer
To limit the short circuiting current so that spatter is reduced
National Electrical Manufactures Association

19. What is the effect of too much slope?
Insufficient current to melt the wire off cleanly
V groove or U groove
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

20. What power sources are used with the GMAW Process?
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Guns
Motor driven generators - Transformer rectifiers - and Inverter designs
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun

21. A 10 minute cycle of welding time vs cooling time a given machine can handle.
15 feet (4.5 meters)
SMAW - GTAW
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Duty cycle

22. What is the purpose of the shielding gas used in GMAW?
Shielding the molten weld metal from atmospheric contamination
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Gas metal arc welding
Pressure vessels and the piping industry

23. What type of power source is commonly used with a voltage sensing wire feeder?
These terms are quite restrictive and often technically incorrect
Constant current (CC)
Dry ice can form within the flow control openings and cause blockage of shielding gas
Wire feeds smoothly (yet will slip should a problem occur in the gun)

24. How are GMAW guns rated?
By there current carrying capacity
Short- circuiting transfer - Globular transfer - Spray transfer
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
1/4 inch to 1/2 inch

25. 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
(DCEP) Direct Current Electrode Positive or Reverse polarity
Duty cycle
12 to 22 arc volts

26. What is the key advantage of short circuiting transfer?
Spatter problems and poor weld appearance
Wire feeds smoothly (yet will slip should a problem occur in the gun)
When the filler wire is in direct contract with the base metal
Minimum distortion due to low heat input

27. Why is the term GMAW preferred over MIG or MAG?
The time rate of response for the current rise and fall
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
These terms are quite restrictive and often technically incorrect
Dry ice can form within the flow control openings and cause blockage of shielding gas

28. List 3 forms compressed gases may be supplied for welding
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
The time rate of response for the current rise and fall
AWS and CSA
Higher 26 to 35 arc volts

29. What does the term GMAW identify?
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
To limit the short circuiting current so that spatter is reduced
Gas metal arc welding
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld

30. Why is a line heater required when using GMAW?
Penetration and burn - off rate of the electrode
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
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun

31. What is the reason glass 'tube' type flowmeters must have the tube mounted truly vertical?
Speed of the feed motor and - starting / stopping electrode feed
Constant current (CC)
Constant- speed wire feeders and Voltage- sennsing wire feeders
...

32. With straight polarity where is 2/3 of the arc energy?
Aluminum wire
The negative side of a welding unit
By there current carrying capacity
Wire feeds smoothly (yet will slip should a problem occur in the gun)

33. When is the metal transferred with short circuit transfer?
Flux cored wires
Pressure vessels and the piping industry
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
When the filler wire is in direct contract with the base metal

34. What 2 controls are found on a GMAW set- up?
5.8 to 12.5 L/min
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Constant- speed wire feeders and Voltage- sennsing wire feeders
Wire feed speed - Voltage control

35. What does the wire feeder control?
Speed of the feed motor and - starting / stopping electrode feed
To limit the short circuiting current so that spatter is reduced
Welding process that joins metals by heating them with an electric arc
Generally not as accurate

36. What effect does increasing and decreasing the inductance have on the weld?
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
12 to 22 arc volts
5.8 to 12.5 L/min
When the filler wire is in direct contract with the base metal

37. 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
The time rate of response for the current rise and fall
When the filler wire is in direct contract with the base metal
DCEP (Direct Current Electrode Positive) Reverse Polarity

38. What is another term for electrode holders for GMAW?
Voltage is the force that overcomes resistance to allow amperage flow
85%
Spatter problems and poor weld appearance
Guns

39. How many times per second does short circuiting take place?
National Electrical Manufactures Association
20 to 200 times per second
Voltage is the force that overcomes resistance to allow amperage flow
Dry ice can form within the flow control openings and cause blockage of shielding gas

40. What current and polarity is generally used with GMAW?
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Controls the rate of flow of a shielding gas to the gun nozzle
DCEP (Direct Current Electrode Positive) Reverse Polarity
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld

41. In the GMAW process what does voltage control?
Puddle fluidity
Minimum distortion due to low heat input
To limit the short circuiting current so that spatter is reduced
These terms are quite restrictive and often technically incorrect

42. Draw a typical volt/amp curve that would be found with a power source designed for SMAW or GTAW
Pressure vessels and the piping industry
If you dont know this check your phone
Constant current (CC)
Constant- speed wire feeders and Voltage- sennsing wire feeders

43. What controls amperage when using GMAW?
Gas metal arc welding
Voltage is the force that overcomes resistance to allow amperage flow
Wire feed speed
Dry ice can form within the flow control openings and cause blockage of shielding gas

44. 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
Pressure vessels and the piping industry
Wire feed speed - Voltage control
15 feet (4.5 meters)

45. What is a typical flow rate of CO2 for short circuit transfer?
85%
Wire feed speed - Voltage control
5.8 to 12.5 L/min
The resistace to electrical current flow increases with it. Causing the electrode to heat

46. Give a brief description of the GMAW process
If you dont know this check your phone
Aluminum wire
Welding process that joins metals by heating them with an electric arc
The negative side of a welding unit

47. What is the recommended electrode stick- out for .035 solid wire?
5.8 to 12.5 L/min
AWS and CSA
1/4 inch to 1/2 inch
Short- circuiting transfer - Globular transfer - Spray transfer

48. List 3 wire drive systems and give a short description of each
Motor driven generators - Transformer rectifiers - and Inverter designs
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
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
Minimum distortion due to low heat input

49. What are the 2 types of wire feeders available?
(DCEP) Direct Current Electrode Positive or Reverse polarity
Constant current (CC)
SMAW - GTAW
Constant- speed wire feeders and Voltage- sennsing wire feeders

50. A machine with a 70% duty cycle can run at its max for 7 minutes with a cooling cycle of only _ minutes.
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Constant voltage (CV)
5.8 to 12.5 L/min
3

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Gas Metal Arc Welding

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