METHOD FOR JOINING DISSIMILAR METAL MATERIALS

To provide a method for joining dissimilar metal materials that can supply a specified high current in pressure application electrification in resistance welding.SOLUTION: A method for joining dissimilar metal materials comprises: a preparation step of preparing a rivet 11, a plurality of metal members 23, shanks 16, 17, and electrode parts 18, 19 provided at tips of the shanks 16, 17; a sandwiching step of sandwiching the rivet 11 and the plurality of metal members 23 between the first electrode 18 and the second electrode 19; and a burying step of burying the rivet 11 in the metal members 23 through pressure application electrification by the first electrode 18 and the second electrode 19. The preparation step includes a step of preparing, as the first electrode 18 and the second electrode 19, the two electrodes 18, 19 satisfy the condition that an electric resistance value of the first electrode 18 and an electric resistance value of the second electrode 19 are equal to or less than the total value of electric resistance values of the plurality of metal members 23 and an electric resistance value of the rivet 11 to be joined together.SELECTED DRAWING: Figure 2 【課題】抵抗溶接時の加圧通電時に、指定の高電流を流すことができる異種金属材の接合方法を提供する。【解決手段】異種金属材の接合方法は、リベット１１と、複数の金属部材２３と、それぞれシャンク１６，１７とシャンク１６，１７の先端に設けられた電極部１８，１９と、を用意する用意工程と、リベット１１および複数の金属部材２３を、第１電極１８と第２電極１９とにより挟む挟み込み工程と、第１電極１８と第２電極１９とにより加圧通電し、リベット１１を金属部材２３に対して埋入させる埋入工程と、を備える。用意工程は、第１電極１８および第２電極１９として、第１電極１８の電気抵抗値および第２電極１９の電気抵抗値が、接合される複数の金属部材２３の電気抵抗値とリベット１１の電気抵抗値との合計値以下である条件を満たす２つの電極１８，１９を用意する工程を含む。【選択図】図２