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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.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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. A 10 minute cycle of welding time vs cooling time a given machine can handle.
Speed of the feed motor and - starting / stopping electrode feed
Duty cycle
Cause flaking - which can clog the liner and contact tube
The resistace to electrical current flow increases with it. Causing the electrode to heat

2. What is the reason glass 'tube' type flowmeters must have the tube mounted truly vertical?
...
Pressure vessels and the piping industry
AWS and CSA
To prevent drawing of liquid CO2 (Carbon Dioxide)

3. What would be an indication that the drive roll pressure is adjusted correctly?
The negative side of a welding unit
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 prevent leakage - Carbon Dioxide (CO2)
Wire feeds smoothly (yet will slip should a problem occur in the gun)

4. What does inductance control?
The negative side of a welding unit
Welding process that joins metals by heating them with an electric arc
Duty cycle
The time rate of response for the current rise and fall

5. What is the purpose of the pick- up lead on a voltage sensing wire feeder?
Cause flaking - which can clog the liner and contact tube
To limit the short circuiting current so that spatter is reduced
...
Gives arc voltage values to the control system of the feeder

6. What is the preferred drive roll design for solid wires?
V groove or U groove
Constant current (CC)
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
When the filler wire is in direct contract with the base metal

7. How many times per second does short circuiting take place?
20 to 200 times per second
These terms are quite restrictive and often technically incorrect
85%
Insufficient current to melt the wire off cleanly

8. What are the 2 types of wire feeders available?
SMAW - GTAW
Constant- speed wire feeders and Voltage- sennsing wire feeders
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Reducing the gas source pressure to a constant working pressure

9. A pull type drive system is usually used on what type of material?
DCEP (Direct Current Electrode Positive) Reverse Polarity
The negative side of a welding unit
Minimum distortion due to low heat input
Aluminum wire

10. In the GMAW process what does voltage control?
Reducing the gas source pressure to a constant working pressure
5.8 to 12.5 L/min
Puddle fluidity
Shielding the molten weld metal from atmospheric contamination

11. How are GMAW guns rated?
5.8 to 12.5 L/min
Dry ice can form within the flow control openings and cause blockage of shielding gas
Higher 26 to 35 arc volts
By there current carrying capacity

12. What is the purpose of a regulator and what does it indicate on its gauges?
AWS and CSA
Guns
Speed of the feed motor and - starting / stopping electrode feed
Reducing the gas source pressure to a constant working pressure

13. What output on the welding machine is used to rate the duty cycle?
If you dont know this check your phone
5.8 to 12.5 L/min
Dry ice can form within the flow control openings and cause blockage of shielding gas
Minutes of elapsed time continually run (out of 10 minutes)

14. Why must CO2 cylinders be used in the vertical position?
Generally not as accurate
To prevent drawing of liquid CO2 (Carbon Dioxide)
15 feet (4.5 meters)
When the filler wire is in direct contract with the base metal

15. What term is used to describe when the workpiece is hooked to the negative pole on the power source?
The time rate of response for the current rise and fall
Penetration and burn - off rate of the electrode
(DCEP) Direct Current Electrode Positive or Reverse polarity
Wire feed speed

16. What is the minimum % value of argon that must be present to use the spray transfer method of GMAW?
1/4 inch to 1/2 inch
DCEP (Direct Current Electrode Positive) Reverse Polarity
Wire feed speed - Voltage control
85%

17. When using flat drive rolls with too much pressure on copper coated solid wires what problem could take place?
Cause flaking - which can clog the liner and contact tube
15 feet (4.5 meters)
Duty cycle
Reducing the gas source pressure to a constant working pressure

18. When is the metal transferred with short circuit transfer?
Motor driven generators - Transformer rectifiers - and Inverter designs
Dry ice can form within the flow control openings and cause blockage of shielding gas
Flux cored wires
When the filler wire is in direct contract with the base metal

19. What processes are constant current (CC) power sources designed to be used with?
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Shielding the molten weld metal from atmospheric contamination
Duty cycle
SMAW - GTAW

20. What happens when the electrode extension is increased?
The resistace to electrical current flow increases with it. Causing the electrode to heat
Wire feeds smoothly (yet will slip should a problem occur in the gun)
V groove or U groove
Welding process that joins metals by heating them with an electric arc

21. What type of power source is commonly used with a voltage sensing wire feeder?
15 feet (4.5 meters)
Constant current (CC)
Guns
Gas metal arc welding

22. 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
SMAW - GTAW
Wire feed speed - Voltage control

23. What is the disadvantage of the gauge preset type of regulator/flowmeter?
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
The negative side of a welding unit
1/4 inch to 1/2 inch
Generally not as accurate

24. List several industries that would use GMAW
1/4 inch to 1/2 inch
Pressure vessels and the piping industry
Constant voltage (CV)
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

25. What does voltage do in an electrical circuit?
Gives arc voltage values to the control system of the feeder
Speed of the feed motor and - starting / stopping electrode feed
Wire feed speed
Voltage is the force that overcomes resistance to allow amperage flow

26. What does the wire feeder control?
Reducing the gas source pressure to a constant working pressure
Generally not as accurate
If you dont know this check your phone
Speed of the feed motor and - starting / stopping electrode feed

27. List 3 forms compressed gases may be supplied for welding
The negative side of a welding unit
Penetration and burn - off rate of the electrode
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
AWS and CSA

28. What current and polarity is generally used with GMAW?
Pressure vessels and the piping industry
Speed of the feed motor and - starting / stopping electrode feed
DCEP (Direct Current Electrode Positive) Reverse Polarity
Voltage is the force that overcomes resistance to allow amperage flow

29. What 2 organizations designate specifications for GMAW wires?
Voltage is the force that overcomes resistance to allow amperage flow
AWS and CSA
The resistace to electrical current flow increases with it. Causing the electrode to heat
Higher 26 to 35 arc volts

30. What is an advantage of pulsed arc transfer with GMAW?
If you dont know this check your phone
Welding process that joins metals by heating them with an electric arc
Guns
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

31. 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
Wire feed speed - Voltage control
To prevent drawing of liquid CO2 (Carbon Dioxide)
Speed of the feed motor and - starting / stopping electrode feed

32. What does the term GMAW identify?
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
V groove or U groove
Gas metal arc welding
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

33. What does the abbreviation NEMA stand for?
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
Duty cycle
National Electrical Manufactures Association
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

34. What is the purpose of the shielding gas used in GMAW?
3
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Short- circuiting transfer - Globular transfer - Spray transfer
Shielding the molten weld metal from atmospheric contamination

35. Why is the term GMAW preferred over MIG or MAG?
Duty cycle
If you dont know this check your phone
These terms are quite restrictive and often technically incorrect
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld

36. What is the maximum distance that hard wire can be successfully pushed?
15 feet (4.5 meters)
Shielding the molten weld metal from atmospheric contamination
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

37. List the basic equipment requirements for the GMAW process
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Pressure - The rate of flow of a shielding gas
85%
Minutes of elapsed time continually run (out of 10 minutes)

38. What type of power source is used with a constant speed wire feeder?
When the filler wire is in direct contract with the base metal
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun
Constant voltage (CV)
Minutes of elapsed time continually run (out of 10 minutes)

39. What power sources are used with the GMAW Process?
Motor driven generators - Transformer rectifiers - and Inverter designs
The negative side of a welding unit
V groove or U groove
...

40. Draw a typical volt amp curve for a machine that is designed for GMAW
To prevent leakage - Carbon Dioxide (CO2)
By there current carrying capacity
Wire feed speed - Voltage control
If you dont know this check your phone

41. Give a description of 'pinch effect'
Pressure vessels and the piping industry
SMAW - GTAW
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Duty cycle

42. What does a flowmeter do and what does it measure?
Higher 26 to 35 arc volts
Controls the rate of flow of a shielding gas to the gun nozzle
20 to 200 times per second
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts

43. Draw a typical volt/amp curve that would be found with a power source designed for SMAW or GTAW
Higher 26 to 35 arc volts
If you dont know this check your phone
Reducing the gas source pressure to a constant working pressure
Insufficient current to melt the wire off cleanly

44. In the GMAW process what does amperage control?
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Penetration and burn - off rate of the electrode
Constant- speed wire feeders and Voltage- sennsing wire feeders
To limit the short circuiting current so that spatter is reduced

45. Why is globular transfer generally avoided with GMAW?
To prevent leakage - Carbon Dioxide (CO2)
Spatter problems and poor weld appearance
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
The time rate of response for the current rise and fall

46. List 3 wire drive systems and give a short description of each
Puddle fluidity
15 feet (4.5 meters)
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

47. With straight polarity where is 2/3 of the arc energy?
The negative side of a welding unit
DCEP (Direct Current Electrode Positive) Reverse Polarity
Higher 26 to 35 arc volts
3

48. 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
The Arc voltage
If you dont know this check your phone
Insufficient current to melt the wire off cleanly

49. List the three methods of metal transfer with GMAW
12 to 22 arc volts
To limit the short circuiting current so that spatter is reduced
Short- circuiting transfer - Globular transfer - Spray transfer
Minutes of elapsed time continually run (out of 10 minutes)

50. What wire are knurled drive rolls most commonly used on?
15 feet (4.5 meters)
If you dont know this check your phone
Controls the rate of flow of a shielding gas to the gun nozzle
Flux cored wires

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Gas Metal Arc Welding

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