Abstract: A method of joining of a ultra high-strength steel and a non-steel material through tailored softening heat treatment using a laser, may include forming a tempering portion by performing heat treatment on a lower plate formed of ultra high-strength steel using the laser; stacking an upper plate formed of a non-steel material on the lower plate formed of the ultra high-strength steel; disposing a connection member on the upper plate; and applying force to the connection member to cause the connection member to pass through the upper plate and then to be inserted into the tempering portion of the lower plate to combine the upper plate and the lower plate.

Abstract: Disclosed are a friction rivet for joining a non-steel material and a steel material and a joining method using the same, wherein inserts are applied to the friction rivet and, thus, the friction rivet doesn't need to be replaced according to materials of a lower plate and damage to an upper plate caused by penetration into the upper plate by the friction rivet may be repaired.