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BASICS OF GMAW MIG WELDING EXAM QUESTIONS AND ANSWERS
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BASICS OF GMAW MIG WELDINGEXAM QUESTIONS AND ANSWERS
The most typical use of GMAW is as a? - ANSWER semi-automated
procedure.
1. Easily automated or mechanized
2. Ideally adapted for robotic uses
What characteristics define the GMAW process? Three things are the hint.
ANSWER 1. A welding gun that continually feeds a solid wire electrode
2. An arc formed between the workpiece and the electrode
3. The gas flowing from the welding gun's nozzle provides all process shielding.
Which two kinds of shielding gases are there? ANSWER 1. Inert (helium,
argon)
2. Reactive (oxygen, carbon dioxide)
Why is carbon dioxide used so frequently? Three explanations, to give you an
idea 1. Reasonably priced 2. Immediately available
3. Increased capacity for penetration
What minimum percentage of argon is needed for spray transfer? ANSWER 80
What else do the shielding gas and flow rate significantly affect besides creating
a protected environment? Seven items, as a hint ANSWER 1. Arc properties
2. The metal transfer method
3. Profile of penetration and weld beads
4. Welding speed 5. Propensity for undercutting
6. Cleaning
7. Mechanical characteristics of weld metal
GMAW's AWS classification and ID system. - ANSWER ERXXS-X 1. "ER"
stands for both rod and electrode.
2. The next two figures represent the minimum tensile strength as-deposited in
thousands of pounds per square inch. 3. "S" denotes an electrode made of solid
wire.
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