Patent ID: 9085220
Filing Date: 2015-07-21
Classification: B23K,B23P,B60J,Y10T

Abstract:
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.