The learner will examine the fundamentals of GMAW.
GMAW Fundamentals: Part 1 of 2
What does the abbreviation GMAW stand for?
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Correct!
What does the abbreviation GMAW stand for?
Correct Answer
Gas Metal Arc Welding
Gas metal arc welding is a welding process that uses an arc between a continuous filler metal electrode and the weld pool.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Incorrect
What does the abbreviation GMAW stand for?
Your Answer
Correct Answer
Gas Metal Arc Welding
Gas metal arc welding is a welding process that uses an arc between a continuous filler metal electrode and the weld pool.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Correct!
What is another abbreviation for GMAW ?
Correct Answer
MIG
MIG stands for Metal Inert Gas.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Incorrect
What is another abbreviation for GMAW ?
Your Answer
Correct Answer
MIG
MIG stands for Metal Inert Gas.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
The three basic metal transfer modes in GMAW are short circuiting, globular transfer, and spray transfer. What would a fourth one be?
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Correct!
The three basic metal transfer modes in GMAW are short circuiting, globular transfer, and spray transfer. What would a fourth one be?
Correct Answer
Pulse spray
Pulse spray is much like a spray transfer but it has two levels of current: one constant lower background current and a second pulsing current that goes above the “transition current” to spray. Pulse spray also requires a special pulsing power source.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Incorrect
The three basic metal transfer modes in GMAW are short circuiting, globular transfer, and spray transfer. What would a fourth one be?
Your Answer
Correct Answer
Pulse spray
Pulse spray is much like a spray transfer but it has two levels of current: one constant lower background current and a second pulsing current that goes above the “transition current” to spray. Pulse spray also requires a special pulsing power source.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
What material thickness is recommended for short circuit transfer?
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Correct!
What material thickness is recommended for short circuit transfer?
Correct Answer
Thin
Because of the low voltages and currents (amps) used, thin material is best suited for short circuit transfer.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Incorrect
What material thickness is recommended for short circuit transfer?
Your Answer
Correct Answer
Thin
Because of the low voltages and currents (amps) used, thin material is best suited for short circuit transfer.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
How many short circuits occur per second while welding in short circuit transfer?
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Correct!
How many short circuits occur per second while welding in short circuit transfer?
Correct Answer
20-250
"Short circuit" is defined as an arc-on/arc-off weld cycle.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Incorrect
How many short circuits occur per second while welding in short circuit transfer?
Your Answer
Correct Answer
20-250
"Short circuit" is defined as an arc-on/arc-off weld cycle.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Buried arc is an offshoot of short circuit. What makes buried arc different from short circuit?
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Correct!
Buried arc is an offshoot of short circuit. What makes buried arc different from short circuit?
Correct Answer
Excessive wire feed speeds (WFS)
Buried arc creates short circuits below the surface of the material.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Incorrect
Buried arc is an offshoot of short circuit. What makes buried arc different from short circuit?
Your Answer
Correct Answer
Excessive wire feed speeds (WFS)
Buried arc creates short circuits below the surface of the material.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Correct!
Globular transfer is the least preferred transfer method.
Correct Answer
True
Globular transfer is the least preferred transfer method because of the large amounts of spatter created and the possibilities of weld discontinuities.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Incorrect
Globular transfer is the least preferred transfer method.
Your Answer
Correct Answer
True
Globular transfer is the least preferred transfer method because of the large amounts of spatter created and the possibilities of weld discontinuities.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Correct!
Spray transfer requires an argon gas content of at least what percentage?
Correct Answer
80%
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Incorrect
Spray transfer requires an argon gas content of at least what percentage?
Your Answer
Correct Answer
80%
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
How many times does the electrode contact the material when welding in spray transfer?
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Correct!
How many times does the electrode contact the material when welding in spray transfer?
Correct Answer
One
Spray transfer is defined as an open arc (always on). Droplets form and detach across the arc at a rate of hundreds per second and therefore only contact the material once at the arc start.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Incorrect
How many times does the electrode contact the material when welding in spray transfer?
Your Answer
Correct Answer
One
Spray transfer is defined as an open arc (always on). Droplets form and detach across the arc at a rate of hundreds per second and therefore only contact the material once at the arc start.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Spray transfer requires high voltages and high WFS. What positions and thickness of material is spray transfer best suited for?
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Correct!
Spray transfer requires high voltages and high WFS. What positions and thickness of material is spray transfer best suited for?
Correct Answer
Flat and horizontal positions using thicker materials
Because of surface tension and gravity, spray transfer is not suited for overhead or vertical positions. And because of the high voltages and WFS, thin materials are not recommended.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Incorrect
Spray transfer requires high voltages and high WFS. What positions and thickness of material is spray transfer best suited for?
Your Answer
Correct Answer
Flat and horizontal positions using thicker materials
Because of surface tension and gravity, spray transfer is not suited for overhead or vertical positions. And because of the high voltages and WFS, thin materials are not recommended.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Increasing wire feed speed will increase all except what?
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Correct!
Increasing wire feed speed will increase all except what?
Correct Answer
Quality
Welding amperage (current) varies with the wire feed speed setting if no other variables are changed. Increasing the current will increase the heat on the wire, producing greater penetration.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Incorrect
Increasing wire feed speed will increase all except what?
Your Answer
Correct Answer
Quality
Welding amperage (current) varies with the wire feed speed setting if no other variables are changed. Increasing the current will increase the heat on the wire, producing greater penetration.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
What happens when voltage is increased?
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Correct!
What happens when voltage is increased?
Correct Answer
The fusion zone increases and the weld zone flattens
Welding voltage is directly related to the arc length. Increasing the voltage will heat the base material more, producing a wider, flatter bead profile.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Incorrect
What happens when voltage is increased?
Your Answer
Correct Answer
The fusion zone increases and the weld zone flattens
Welding voltage is directly related to the arc length. Increasing the voltage will heat the base material more, producing a wider, flatter bead profile.
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Question 1 of 10
GMAW Fundamentals: Part 1 of 2
What happens when voltage is decreased?
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Correct!
What happens when voltage is decreased?
Correct Answer
A narrow weld bead with a high crown is produced
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Incorrect
What happens when voltage is decreased?
Your Answer
Correct Answer
A narrow weld bead with a high crown is produced
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
What two settings dictate the mode of transfer you are in?
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Correct!
What two settings dictate the mode of transfer you are in?
Correct Answer
Wire feed speed and voltage
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Incorrect
What two settings dictate the mode of transfer you are in?
Your Answer
Correct Answer
Wire feed speed and voltage
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
What material can NOT be welded with GMAW?
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Correct!
What material can NOT be welded with GMAW?
Correct Answer
Cardboard
Carbon steel, high-strength low-alloy steel, stainless steel, aluminum, copper, titanium, and nickel alloys can be welded with GMAW by choosing the appropriate combination of shielding gases, electrodes, and welding variables.
Finish
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
Incorrect
What material can NOT be welded with GMAW?
Your Answer
Correct Answer
Cardboard
Carbon steel, high-strength low-alloy steel, stainless steel, aluminum, copper, titanium, and nickel alloys can be welded with GMAW by choosing the appropriate combination of shielding gases, electrodes, and welding variables.
Finish
Question 1 of 10
GMAW Fundamentals: Part 1 of 2
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- 11/5/2013
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- 11/5/2013
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GMAW Fundamentals: Part 1 of 2 by Fox Valley Technical College is licensed under a Creative Commons Attribution 3.0 Unported License.