Test your basic knowledge |

Gas Metal Arc Welding

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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. Give a brief description of the GMAW process
Welding process that joins metals by heating them with an electric arc
Pressure - The rate of flow of a shielding gas
Constant current (CC)
Duty cycle

2. What processes are constant current (CC) power sources designed to be used with?
SMAW - GTAW
Cause flaking - which can clog the liner and contact tube
The Arc voltage
Spatter problems and poor weld appearance

3. What is a solenoid valve and what actuates it?
If you dont know this check your phone
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Controls the rate of flow of a shielding gas to the gun nozzle
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun

4. In the GMAW process what does voltage control?
To prevent leakage - Carbon Dioxide (CO2)
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Puddle fluidity
The Arc voltage

5. Why is a fiber washer required and what cylinder gas requires it?
AWS and CSA
To prevent leakage - Carbon Dioxide (CO2)
Guns
Voltage is the force that overcomes resistance to allow amperage flow

6. What is another term for electrode holders for GMAW?
...
Aluminum wire
Guns
Higher 26 to 35 arc volts

7. Draw a typical volt amp curve for a machine that is designed for GMAW
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
85%
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

8. What is the recommended electrode stick- out for .035 solid wire?
1/4 inch to 1/2 inch
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
These terms are quite restrictive and often technically incorrect

9. What is the purpose of the shielding gas used in GMAW?
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Pressure - The rate of flow of a shielding gas
3
Shielding the molten weld metal from atmospheric contamination

10. What output on the welding machine is used to rate the duty cycle?
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Minutes of elapsed time continually run (out of 10 minutes)
Dry ice can form within the flow control openings and cause blockage of shielding gas
Spatter problems and poor weld appearance

11. What is the main purpose of 'slope'?
By there current carrying capacity
If you dont know this check your phone
Insufficient current to melt the wire off cleanly
To limit the short circuiting current so that spatter is reduced

12. Is the arc voltage for spray transfer higher or lower than that used for short circuit transfer?
Higher 26 to 35 arc volts
Wire feed speed
Gives arc voltage values to the control system of the feeder
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

13. In the GMAW process what does amperage control?
(DCEP) Direct Current Electrode Positive or Reverse polarity
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
Pressure vessels and the piping industry
Penetration and burn - off rate of the electrode

14. A pull type drive system is usually used on what type of material?
Insufficient current to melt the wire off cleanly
AWS and CSA
Aluminum wire
Reducing the gas source pressure to a constant working pressure

15. Why is a line heater required when using GMAW?
Dry ice can form within the flow control openings and cause blockage of shielding gas
The negative side of a welding unit
Puddle fluidity
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

16. What is the minimum % value of argon that must be present to use the spray transfer method of GMAW?
85%
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
If you dont know this check your phone

17. Why must CO2 cylinders be used in the vertical position?
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
These terms are quite restrictive and often technically incorrect
To prevent drawing of liquid CO2 (Carbon Dioxide)
Shielding the molten weld metal from atmospheric contamination

18. A machine with a 70% duty cycle can run at its max for 7 minutes with a cooling cycle of only _ minutes.
3
Gives arc voltage values to the control system of the feeder
...
85%

19. List the factors that determine the mode of metal 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
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
The Arc voltage

20. What is the disadvantage of the gauge preset type of regulator/flowmeter?
AWS and CSA
Generally not as accurate
Speed of the feed motor and - starting / stopping electrode feed
Cause flaking - which can clog the liner and contact tube

21. What does the abbreviation NEMA stand for?
Insufficient current to melt the wire off cleanly
Penetration and burn - off rate of the electrode
National Electrical Manufactures Association
Pressure vessels and the piping industry

22. How many times per second does short circuiting take place?
Higher 26 to 35 arc volts
20 to 200 times per second
Welding process that joins metals by heating them with an electric arc
Reducing the gas source pressure to a constant working pressure

23. Give a description of 'pinch effect'
15 feet (4.5 meters)
Insufficient current to melt the wire off cleanly
Molten metal is separated from the end of the filler wire by a squeezing force created by a magnetic field
Voltage is the force that overcomes resistance to allow amperage flow

24. What power sources are used with the GMAW Process?
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Short- circuiting transfer - Globular transfer - Spray transfer
Gas metal arc welding
Motor driven generators - Transformer rectifiers - and Inverter designs

25. Why is globular transfer generally avoided with GMAW?
Penetration and burn - off rate of the electrode
Insufficient current to melt the wire off cleanly
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

26. List the three methods of metal transfer with GMAW
Flux cored wires
Short- circuiting transfer - Globular transfer - Spray transfer
Constant voltage (CV)
Shielding the molten weld metal from atmospheric contamination

27. What is an advantage of pulsed arc transfer with GMAW?
The time rate of response for the current rise and fall
12 to 22 arc volts
1/4 inch to 1/2 inch
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

28. List the basic equipment requirements for the GMAW process
If you dont know this check your phone
Pressure - The rate of flow of a shielding gas
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system

29. What is a typical flow rate of CO2 for short circuit transfer?
5.8 to 12.5 L/min
Wire feed speed - Voltage control
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
By there current carrying capacity

30. What is the purpose of the pick- up lead on a voltage sensing wire feeder?
If you dont know this check your phone
Gives arc voltage values to the control system of the feeder
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Short- circuiting transfer - Globular transfer - Spray transfer

31. What does voltage do in an electrical circuit?
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
20 to 200 times per second
Voltage is the force that overcomes resistance to allow amperage flow

32. What controls the wire speed on a voltage sensing wire feeder?
The Arc voltage
Aluminum wire
3
12 to 22 arc volts

33. A 10 minute cycle of welding time vs cooling time a given machine can handle.
Gives arc voltage values to the control system of the feeder
Controls the rate of flow of a shielding gas to the gun nozzle
Constant voltage (CV)
Duty cycle

34. What is the reason glass 'tube' type flowmeters must have the tube mounted truly vertical?
Pressure vessels and the piping industry
The resistace to electrical current flow increases with it. Causing the electrode to heat
AWS and CSA
...

35. What happens when the electrode extension is increased?
5.8 to 12.5 L/min
The resistace to electrical current flow increases with it. Causing the electrode to heat
Short- circuiting transfer - Globular transfer - Spray transfer
These terms are quite restrictive and often technically incorrect

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
The Arc voltage
When the filler wire is in direct contract with the base metal
Pressure vessels and the piping industry

37. What does a flowmeter do and what does it measure?
Motor driven generators - Transformer rectifiers - and Inverter designs
12 to 22 arc volts
AWS and CSA
Controls the rate of flow of a shielding gas to the gun nozzle

38. List several industries that would use GMAW
85%
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Aluminum wire
Pressure vessels and the piping industry

39. What is the preferred drive roll design for solid wires?
If you dont know this check your phone
To prevent leakage - Carbon Dioxide (CO2)
Pressure - The rate of flow of a shielding gas
V groove or U groove

40. When is the metal transferred with short circuit transfer?
Duty cycle
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
When the filler wire is in direct contract with the base metal

41. Draw a typical volt/amp curve that would be found with a power source designed for SMAW or GTAW
When the filler wire is in direct contract with the base metal
Shielding the molten weld metal from atmospheric contamination
Constant current (CC)
If you dont know this check your phone

42. What does the wire feeder control?
AWS and CSA
Minutes of elapsed time continually run (out of 10 minutes)
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

43. What are the 2 types of wire feeders available?
Motor driven generators - Transformer rectifiers - and Inverter designs
To prevent drawing of liquid CO2 (Carbon Dioxide)
The Arc voltage
Constant- speed wire feeders and Voltage- sennsing wire feeders

44. List 3 forms compressed gases may be supplied for welding
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
3
Gas metal arc welding
Heat input is less than spray transfer - resulting in less distortion - Used in all positions due to controlling the weld metal freeze

45. Why is the term GMAW preferred over MIG or MAG?
These terms are quite restrictive and often technically incorrect
Aluminum wire
...
To prevent drawing of liquid CO2 (Carbon Dioxide)

46. What is the effect of too much slope?
Short- circuiting transfer - Globular transfer - Spray transfer
Generally not as accurate
Insufficient current to melt the wire off cleanly
The time rate of response for the current rise and fall

47. How are GMAW guns rated?
By there current carrying capacity
Minimum distortion due to low heat input
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
Minutes of elapsed time continually run (out of 10 minutes)

48. When using flat drive rolls with too much pressure on copper coated solid wires what problem could take place?
Constant voltage (CV)
Cause flaking - which can clog the liner and contact tube
Pressure - The rate of flow of a shielding gas
Constant current (CC)

49. What wire are knurled drive rolls most commonly used on?
The resistace to electrical current flow increases with it. Causing the electrode to heat
The Arc voltage
Flux cored wires
The negative side of a welding unit

50. List 3 wire drive systems and give a short description of each
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
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
If you dont know this check your phone
3

Can you answer 50 questions in 15 minutes?

Major Subjects
Tests & Exams AP CLEP DSST GRE SAT GMAT	Certifications CISSP go to https://www.isc2.org/ PMP ITIL RHCE MCTS More...	IT Skills Android Programming Data Modeling Objective C Programming Basic Python Programming Adobe Illustrator More...	Business Skills Advertising Techniques Business Accounting Basics Business Strategy Human Resource Management Marketing Basics More...
Soft Skills Body Language People Skills Public Speaking Persuasion Job Hunting And Resumes More...	Vocabulary GRE Vocab SAT Vocab TOEFL Essential Vocab Basic English Words For All Global Words You Should Know Business English More...	Languages AP German Vocab AP Latin Vocab SAT Subject Test: French Italian Survival Norwegian Survival More...	Engineering Audio Engineering Computer Science Engineering Aerospace Engineering Chemical Engineering Structural Engineering More...
Health Sciences Basic Nursing Skills Health Science Language Fundamentals Veterinary Technology Medical Language Cardiology Clinical Surgery More...	English Grammar Fundamentals Literary And Rhetorical Vocab Elements Of Style Vocab Introduction To English Major Complete Advanced Sentences Literature Homonyms More...	Math Algebra Formulas Basic Arithmetic: Measurements Metric Conversions Geometric Properties Important Math Facts Number Sense Vocab Business Math More...	Other Major Subjects Science Economics History Law Performing-arts Cooking Logic & Reasoning Trivia

Test your basic knowledge |

Gas Metal Arc Welding

Can you answer 50 questions in 15 minutes?

Let me suggest you:

Browse all subjects

Browse all tests

Most popular tests

Major Subjects

Tests & Exams

Certifications

IT Skills

Business Skills

Soft Skills

Vocabulary

Languages

Engineering

Health Sciences

English

Math

Other Major Subjects

Browse all subjects

Browse all tests

Most popular tests