MANUFACTURING METHOD FOR A DOOR IMPACT BEAM AND THE DOOR IMPACT BEAM

摘要

The present invention relates to a door impact beam manufacturing method, comprising the following steps of: roll-forming a hot rolled steel sheet into a beam shape having a circular cross section; diffusion-bonding opposite both ends of the beam; pressing the beam; and annealing the beam. According to the present invention, a joint unit softening problem is solved without addition of a heat treatment process, and joining and annealing of a steel pipe in manufacture of the door impact beam can be integrated.