Red Seal Welding Practice Exam

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What type of liner is used for FCAW?

Copper
Aluminum
Stainless steel
Plastic

The correct answer is: Stainless steel

FCAW stands for Flux-Cored Arc Welding, a type of welding process where a continuous wire electrode is fed through a welding gun, which melts and joins the base metals together. In this welding method, the electrode is coated with flux, which creates a shielding gas to protect the weld from atmospheric contamination. Out of the given choices, stainless steel is the only suitable liner for FCAW. Copper would not be suitable because it is a conductor and could potentially cause short circuits. Aluminum is too soft to withstand the high temperatures and friction involved in the welding process. Plastic is not strong enough to hold the welding wire and could melt or deform. Stainless steel, on the other hand, is durable, heat-resistant, and has a low coefficient of friction, making it the ideal choice for FCAW.