在管路系统中,常有两根不同直径薄壁管对接,接头间需要增加异径过渡段。解决方法有两种:一种是用厚度与管子相同的薄板展开成扇形,即裁正圆锥下料焊接成过渡段(见图1a);第二种是将管端直径缩小至要求的小直径,然后焊接(见图1b),现将第二种方法介绍如下。 In the pipeline system, there are often two different diameter thin-walled pipe butt joints, joints need to increase the diameter of the transitional section. There are two solutions: one is to use the same thickness of the tube plate expanded into fan shape, that cut the cone welded into a transitional section (see Figure 1a); the second is the tube end diameter reduced to the required diameter , And then welding (see Figure 1b), the second method is introduced below.