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The technique of joining two or more materialsu2014typically metalsu2014by heat, pressure, or both is called welding. Material can be bonded with or without additional filler components when heated to a melting point. With enough heat, thermoplastics, for instance, can be permanently joined together through welding.<br><br>Numerous energy sources, such as gas flames, electric arcs, electric resistance, lasers, electron beams, friction, molten metal baths, and ultrasound, can be used to perform welding.
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