RESISTANCE SPOT WELDING METHOD OF ALUMINUM MEMBER

PROBLEM TO BE SOLVED: To provide a resistance spot welding method of an aluminum member capable of lengthening the electrode service life, and capable of also increasing the welding dot number for stably forming a melting nugget.SOLUTION: A resistance spot welding method of an aluminum member relatively rotates or rocks electrodes 11 and 13 and a polishing tool 15 in a state of push-contacting the polishing tool 15 having a polishing base board 17 having a recess part having a curved surface along a curved surface shape of an electrode tip surface and polishing sheets 19A and 19B for covering at least the recess part of the polishing base board 17 by sandwiching the polishing sheets 19A and 19B by the electrodes 11 and 13 and the polishing base board 17 after welding at least any welding dot among a plurality of welding dots of a lap joint.SELECTED DRAWING: Figure 1 【課題】電極寿命を延ばすことができ、しかも溶融ナゲットが安定形成される溶接打点数を増やすことができるアルミニウム部材の抵抗スポット溶接方法を提供する。【解決手段】アルミニウム部材の抵抗スポット溶接方法は、重ね継手の複数の溶接打点のうち少なくともいずれかの溶接打点の溶接後に、電極先端面の曲面形状に沿った曲面を有する凹み部を備える研磨基板１７と、研磨基板１７の少なくとも凹み部を覆う研磨シート１９Ａ，１９Ｂと、を有する研磨ツール１５を、電極１１，１３と研磨基板１７とが研磨シート１９Ａ，１９Ｂを挟んで押し当てられた状態で、電極１１，１３と研磨ツール１５とを相対的に回転又は揺動させるようにした。【選択図】図１