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金属製の芯材と、この芯材を被覆すると共に、ステンレスなどの金属製粒状や繊維状の導電材の混入合成樹脂膜とで被覆材を製造し、この被覆材の交差する重なり部分或いは接合接触部分を加圧下に溶接電流を印加して、上記導電材の発熱にともなう上記合成樹脂膜の溶融により前記合成樹脂膜相互の溶着と同時に上記芯材相互を溶接するようにしたことを特徴とする被覆材の溶着方法。A metal core, as well as covering the core material, to produce a dressing with a mixed synthetic resins film of the conductive material of the metal particulate and fibrous, such as stainless steel, or partially overlap the intersection of the coating material A welding current is applied to the joint contact portion under pressure, and the core material is welded at the same time as the synthetic resin film is welded by melting the synthetic resin film due to heat generation of the conductive material. A method for welding the covering material.