Answer: The answer is an Arc Welder.
Explanation:
The Arc Welding process uses plasma to transfer an electric arc to a work piece.
Arc welder is the device which uses the plasma technology to do welding of metals.
Plasma technology is based on the fact that matter changes its state when energy is applied: that is solids becomes liquid, and liquids becomes gaseous on application of energy. Plasma technology is used when fire is used.
Arc welder is the device which uses the plasma technology to do welding of metals.
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