Method of joining steel members, joining force enhancement method in the assembly consisting of steel members, die-casting products and steel products

摘要

Providing steel member preparation step the steel members of the two, in a state of butting the predetermined joining surface of the steel member 2, the method of bonding the steel member of the present invention, while being pressed under a pressure given the steel members of two by heating the bondable first temperature steel two members, the joint body forming step of forming a conjugate, after heating to a second temperature of A ₁ transformation point or more in the steel member assembly, the A ₁ By conditions to be applied 5 hours to lowered to 600 ℃ from the transformation point, and slowly cooled to a third temperature of 600 ℃ following the assembly, in this order and the bonding force strengthening step to strengthen the bonding force in the assembly including. Therefore, according to the joining method of the steel member of the present invention, it is possible to obtain sufficiently high bonding strength even when manufacturing a bonded body by bonding to each other steel members of two.