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Shielding gases in the gas metal arc process are used primarily to protect the molten metal from oxidation and ____________________.

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With the feed running, adjust the ____________________ so that the reel stops when the feed stops.

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​The only difference between all GMA welding machines and some FCA welding machines is that all GMA welding machines must have a ______________.


A) ​cooling water system
B) ​shielding gas solenoid
C) ​air cooling fan
D) ​power contactor to start and stop the current

E) A) and B)
F) None of the above

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​Too light of a feed roller pressure can _______________.


A) ​prevent damage to the welding wire
B) ​be used to prevent bird-nesting
C) ​cause erratic wire feeding
D) ​help to reduce the roller's wear

E) C) and D)
F) A) and B)

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​The wire feed speed on charts are generally given in ___________________.


A) ​pounds for filler wire per minute
B) ​amperage and voltage
C) ​pounds per square inch of weld area
D) ​inches per minute

E) B) and C)
F) B) and D)

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The more cost efficient welders can be, the more ___________ they and their companies become.

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The ____ the density of a gas, the ____ will be the flow rate required for equal arc protection.


A) lower, lower
B) lower, higher
C) higher, higher
D) lower, slower

E) B) and C)
F) A) and D)

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​Which of the following gases is the least dense?


A) ​Oxygen
B) ​Carbon dioxide
C) ​Argon
D) ​Helium

E) A) and C)
F) All of the above

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High gas flow rates ____.


A) provide better weld coverage
B) waste shielding gases
C) decrease the venturi effect
D) decrease contamination

E) A) and D)
F) A) and B)

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​Short electrode stickout gives a _____ weld and a long stickout results in a ______ weld.


A) ​slower, faster
B) ​wider, deeper
C) ​higher buildup, deeper penetrating
D) ​hotter, cooler

E) A) and C)
F) B) and C)

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