Patent ID: 8555507

Claim:
A method for fabricating a member of a vehicle by assembling an inner member and an outer member, the method comprising: preparing blanks, each of which is made of a boron steel plate, for the inner member and the outer member; forming the inner member and the outer member by a hot press forming process at a temperature that is equal to or higher than a transformation point using the blanks; cooling the inner member and the outer member formed by the hot press forming process by a first cooling method so as to obtain a first metal organization having a high-rigidity; heating, for a second time, a pre-calculated position of each of the inner member and the outer member having the first metal organization of high-rigidity, in consideration of a directivity of energy absorption, up to the transformation point through a heating source; cooling, for a second time, the inner member and the outer member formed by the hot press forming process by a second cooling method so as to obtain a second metal organization partially having a relatively low-rigidity; and assembling the inner member and the outer member partially having the second metal organization in the first metal organization.