Different material engagement electric kettle welding, engagement accessory and different material welding connector

摘要

A different materials welding joint (1) is provided with: an upper plate (10) that is made of an aluminum alloy or a magnesium alloy; and a lower plate (20) that is made of steel and is arc-spot welded to the upper plate (10), wherein the upper plate (10) has a hole (11) that faces a surface superposed on the lower plate (20). The different materials welding joint (1) is further provided with a joining auxiliary member (30) which is made of steel, which has a stepped external shape having an insertion part (31) to be inserted into the hole (11) provided to the upper plate (10) and a non-insertion part (32), and in which a hollow part (33) penetrating the insertion part (31) and the non-insertion part (32) is formed. The hollow part (33) of the joining auxiliary member (30) is filled with a welding metal (40) made of an iron alloy or Ni alloy, and a melting part (W) is formed by the welding metal (40), and portions of the lower plate (20) and the joining auxiliary member (30) which have been melted.