Door sash

摘要

When a formed product having undergone roll forming and welding is bent in the shape of a door sash, the formed product may distort and/or deform. Such distortion and/or deformation is reduced to a sufficient degree. A door sash is formed by bending an elongated metal plate in a widthwise direction such that portions thereof are superimposed, which are welded together for unification. The door sash has a joint portion extending in a longitudinal direction and having exposed surfaces extending continuously in the widthwise direction, a pocket portion extending continuously from one widthwise end of the joint portion and being to be located on the inner side of a vehicle, and a design portion extending continuously from the other widthwise end of the joint portion and being to be located on the outer side of the vehicle. The door sash is bent in the longitudinal direction, and has two parallel welding marks formed on each of the exposed surfaces of the joint portion and extending in the longitudinal direction.

主权项

1. A method of manufacturing a door sash, the method comprising:
roll-forming of an elongated metal plate into a shape which includes a superimposed portion extending in a longitudinal direction and including exposed surfaces extending continuously in a widthwise direction, a pocket portion extending from one widthwise end of the superimposed portion, and a design portion extending from another widthwise end of the superimposed portion; and performing seam welding on the superimposed portion while passing the superimposed portion between roller electrodes each of which includes edge protrusions formed along opposite edges of a circumferential surface of said each of the roller electrodes to form two welding marks on each of the exposed surfaces of the superimposed portion extending continuously in the longitudinal direction respectively and a fusion portion surrounded by the four welding marks in total so as to unite plates which are constituents of the superimposed portion.