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The term "welding" refers to the joining of several parts using a heat source and / or compression, so that these parts form a continuum. The heat source used for welding is generally an electric arc generated by the welding device. This method is called arc welding. Metal melting is only possible with the heat produced by the arc, so that the welded parts melt together when the temperature reaches the melting point of metals. This technique can be used in TIG welding, for example.