为了装配和焊接用薄板材料制成的圆筒形、圆锥形和球形容器的环形焊缝,现向您介绍一种与普通铜垫板构造不同的新型垫板。该新型垫板主要是由底座、流槽、槽腔、与工件接触的外壳等几部分组成,如图1所示。图1中a是用于装配焊接圆筒形容器的垫板;b是用于装配焊接圆锥形容器的垫板。这种垫板是用焊有件6的底座制成,在底座上有 In order to assemble and weld the annular weld of cylindrical, conical and spherical containers made of thin sheet material, we now introduce a new type of pad with a different construction from ordinary copper pads. The new backing plate is mainly composed of a base, a runner, a cavity, a shell in contact with the workpiece, and the like, as shown in FIG. 1. In Fig. 1, a is a pad for mounting a welded cylindrical container; and b is a pad for mounting a welded conical container. This pad is welded with a base 6 made on the base