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介绍了三层卷焊管的特点及生产工艺过程。着重说明其坯料的准备、成型及钎焊的特点。介绍了两种典型的生产工艺流程。指出该工艺是对传统制管工艺的发展和创新，是以焊管代替小直径厚壁管的又一新途径。
The characteristics and production process of three-layer roll welded pipe are introduced. Focus on the preparation of its blank, forming and brazing characteristics. Two typical production processes are introduced. It is pointed out that the process is the development and innovation of the traditional pipe making process and is another new way to replace the small diameter thick-walled pipe with welded pipe.