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. 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
By there current carrying capacity
Generally not as accurate
If you dont know this check your phone

2. What output on the welding machine is used to rate the duty cycle?
Minutes of elapsed time continually run (out of 10 minutes)
Insufficient current to melt the wire off cleanly
Constant voltage (CV)
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun

3. 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
Short- circuiting transfer - Globular transfer - Spray transfer
Wire feed speed
Duty cycle

4. What type of power source is commonly used with a voltage sensing wire feeder?
Constant current (CC)
1/4 inch to 1/2 inch
(DCEP) Direct Current Electrode Positive or Reverse polarity
To limit the short circuiting current so that spatter is reduced

5. A 10 minute cycle of welding time vs cooling time a given machine can handle.
SMAW - GTAW
1/4 inch to 1/2 inch
Duty cycle
Controls the rate of flow of a shielding gas to the gun nozzle

6. Why is a line heater required when using GMAW?
Increasing inductance increases puddle fluidity - improves penatration - makes the bead flatter and smoother - and reduces spatter. To much inductance though will create erratic starts
Minutes of elapsed time continually run (out of 10 minutes)
Wire feed speed
Dry ice can form within the flow control openings and cause blockage of shielding gas

7. What is an advantage of pulsed arc transfer with GMAW?
By there current carrying capacity
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
(DCEP) Direct Current Electrode Positive or Reverse polarity

8. What does voltage do in an electrical circuit?
Voltage is the force that overcomes resistance to allow amperage flow
DCEP (Direct Current Electrode Positive) Reverse Polarity
3
Speed of the feed motor and - starting / stopping electrode feed

9. What is the preferred drive roll design for solid wires?
Constant voltage (CV)
Shielding the molten weld metal from atmospheric contamination
Gives arc voltage values to the control system of the feeder
V groove or U groove

10. Give a brief description of the GMAW process
Welding process that joins metals by heating them with an electric arc
Motor driven generators - Transformer rectifiers - and Inverter designs
85%
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

11. What 2 controls are found on a GMAW set- up?
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Wire feed speed - Voltage control
Compressed gas cylinder - Liquid filled cylinder - or a Liquid bulk system
5.8 to 12.5 L/min

12. What does a flowmeter do and what does it measure?
Flux cored wires
Controls the rate of flow of a shielding gas to the gun nozzle
DCEP (Direct Current Electrode Positive) Reverse Polarity
Puddle fluidity

13. How many times per second does short circuiting take place?
Minimum distortion due to low heat input
Motor driven generators - Transformer rectifiers - and Inverter designs
20 to 200 times per second
Insufficient current to melt the wire off cleanly

14. What is a solenoid valve and what actuates it?
20 to 200 times per second
If you dont know this check your phone
Puddle fluidity
Electricaly operated valves that control the flow of shielding gas to the weld zone. The control switch located on the gun

15. List several industries that would use GMAW
Flux cored wires
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
When the filler wire is in direct contract with the base metal
Pressure vessels and the piping industry

16. Why is a fiber washer required and what cylinder gas requires it?
To limit the short circuiting current so that spatter is reduced
Minimum distortion due to low heat input
Wire feed speed
To prevent leakage - Carbon Dioxide (CO2)

17. Why must CO2 cylinders be used in the vertical position?
To prevent drawing of liquid CO2 (Carbon Dioxide)
Aluminum wire
15 feet (4.5 meters)
3

18. What is the effect of too much slope?
The negative side of a welding unit
Pressure vessels and the piping industry
Insufficient current to melt the wire off cleanly
Welding process that joins metals by heating them with an electric arc

19. A machine with a 70% duty cycle can run at its max for 7 minutes with a cooling cycle of only _ minutes.
Constant current (CC)
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
Cause flaking - which can clog the liner and contact tube

20. List the factors that determine the mode of metal transfer
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
Constant current (CC)
Motor driven generators - Transformer rectifiers - and Inverter designs
Pressure - The rate of flow of a shielding gas

21. What power sources are used with the GMAW Process?
Shielding the molten weld metal from atmospheric contamination
Motor driven generators - Transformer rectifiers - and Inverter designs
Pressure - The rate of flow of a shielding gas
The time rate of response for the current rise and fall

22. What is the purpose of the shielding gas used in GMAW?
Aluminum wire
Wire feed speed - Voltage control
Wire feeds smoothly (yet will slip should a problem occur in the gun)
Shielding the molten weld metal from atmospheric contamination

23. What term is used to describe when the workpiece is hooked to the negative pole on the power source?
Constant current (CC)
(DCEP) Direct Current Electrode Positive or Reverse polarity
Minimum distortion due to low heat input
Controls the rate of flow of a shielding gas to the gun nozzle

24. What does the wire feeder control?
Higher 26 to 35 arc volts
85%
Motor driven generators - Transformer rectifiers - and Inverter designs
Speed of the feed motor and - starting / stopping electrode feed

25. What is a typical flow rate of CO2 for short circuit transfer?
Reducing the gas source pressure to a constant working pressure
5.8 to 12.5 L/min
Penetration and burn - off rate of the electrode
To prevent leakage - Carbon Dioxide (CO2)

26. When using flat drive rolls with too much pressure on copper coated solid wires what problem could take place?
Speed of the feed motor and - starting / stopping electrode feed
Cause flaking - which can clog the liner and contact tube
To limit the short circuiting current so that spatter is reduced
Voltage is the force that overcomes resistance to allow amperage flow

27. With straight polarity where is 2/3 of the arc energy?
When the filler wire is in direct contract with the base metal
If you dont know this check your phone
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
The negative side of a welding unit

28. In the GMAW process what does voltage control?
Minutes of elapsed time continually run (out of 10 minutes)
Puddle fluidity
Voltage is the force that overcomes resistance to allow amperage flow
Gas metal arc welding

29. 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
Controls the rate of flow of a shielding gas to the gun nozzle
To limit the short circuiting current so that spatter is reduced
Welding process that joins metals by heating them with an electric arc

30. What processes are constant current (CC) power sources designed to be used with?
20 to 200 times per second
DCEP (Direct Current Electrode Positive) Reverse Polarity
SMAW - GTAW
Wire feed speed - Voltage control

31. What is the main purpose of 'slope'?
Insufficient current to melt the wire off cleanly
Puddle fluidity
To limit the short circuiting current so that spatter is reduced
5.8 to 12.5 L/min

32. What is the maximum distance that hard wire can be successfully pushed?
The Arc voltage
Higher 26 to 35 arc volts
Welding Current - Filler wire diameter - arc length - type of shielding - position of the weld
15 feet (4.5 meters)

33. 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
Pressure vessels and the piping industry
Wire feed speed - Voltage control
The resistace to electrical current flow increases with it. Causing the electrode to heat

34. What are the 2 types of wire feeders available?
Constant- speed wire feeders and Voltage- sennsing wire feeders
12 to 22 arc volts
Constant voltage (CV)
Penetration and burn - off rate of the electrode

35. List the three methods of metal transfer with GMAW
Short- circuiting transfer - Globular transfer - Spray transfer
Minutes of elapsed time continually run (out of 10 minutes)
Constant voltage (CV)
Wire feeds smoothly (yet will slip should a problem occur in the gun)

36. What wire are knurled drive rolls most commonly used on?
Flux cored wires
V groove or U groove
DCEP (Direct Current Electrode Positive) Reverse Polarity
To limit the short circuiting current so that spatter is reduced

37. What would be an indication that the drive roll pressure is adjusted correctly?
12 to 22 arc volts
Wire feeds smoothly (yet will slip should a problem occur in the gun)
V groove or U groove
DCEP (Direct Current Electrode Positive) Reverse Polarity

38. What does the abbreviation NEMA stand for?
Generally not as accurate
To limit the short circuiting current so that spatter is reduced
National Electrical Manufactures Association
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground

39. A pull type drive system is usually used on what type of material?
Aluminum wire
When the filler wire is in direct contract with the base metal
3
SMAW - GTAW

40. Why is globular transfer generally avoided with 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
Minutes of elapsed time continually run (out of 10 minutes)

41. What is the recommended electrode stick- out for .035 solid wire?
1/4 inch to 1/2 inch
Higher 26 to 35 arc volts
Voltage is the force that overcomes resistance to allow amperage flow
Gives arc voltage values to the control system of the feeder

42. In the GMAW process what does amperage control?
Flux cored wires
Generally not as accurate
Reducing the gas source pressure to a constant working pressure
Penetration and burn - off rate of the electrode

43. What is the reason glass 'tube' type flowmeters must have the tube mounted truly vertical?
Controls the rate of flow of a shielding gas to the gun nozzle
Duty cycle
Power source - wire feeder - welding gun - Spooled filler wire - Shielding gas - and a ground
...

44. What is the purpose of the pick- up lead on a voltage sensing wire feeder?
If you dont know this check your phone
Guns
Gives arc voltage values to the control system of the feeder
Wire feed speed

45. Why is the term GMAW preferred over MIG or MAG?
Speed of the feed motor and - starting / stopping electrode feed
Constant voltage (CV)
To limit the short circuiting current so that spatter is reduced
These terms are quite restrictive and often technically incorrect

46. What type of power source is used with a constant speed wire feeder?
The time rate of response for the current rise and fall
Aluminum wire
Insufficient current to melt the wire off cleanly
Constant voltage (CV)

47. What does inductance control?
Controls the rate of flow of a shielding gas to the gun nozzle
The time rate of response for the current rise and fall
Shielding the molten weld metal from atmospheric contamination
Minimum distortion due to low heat input

48. What is the minimum % value of argon that must be present to use the spray transfer method of GMAW?
5.8 to 12.5 L/min
DCEP (Direct Current Electrode Positive) Reverse Polarity
To limit the short circuiting current so that spatter is reduced
85%

49. How are GMAW guns rated?
By there current carrying capacity
If you dont know this check your phone
Higher 26 to 35 arc volts
Voltage is the force that overcomes resistance to allow amperage flow

50. What is another term for electrode holders for GMAW?
Constant voltage (CV)
85%
Guns
Speed of the feed motor and - starting / stopping electrode feed

Sorry, Topic not found.:)

Seach or Brouse Basicversity:

Major Subjects
Tests & Exams AP CLEP DSST GRE SAT GMAT	Certifications CISSP go 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

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