In flash butt welding, the forced out metal is called flash.

Name: In flash butt welding, the forced out metal is called flash.
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In flash butt welding, the metal that is expelled during the welding process due to the heat and pressure is indeed referred to as "flash." This occurs as the parts are brought together and current is applied, causing the material at the interface to heat, melt, and be expelled, creating a strong joint once the metal cools and solidifies.

In Flash Butt Welding, the Forced Out Metal Is Called