The paper introduced pipe internal welding machine's composition, necessary equipment and unique advantage in large diameter thick wall pipe construction.
介绍管道内焊机的结构、配套设备及在大口径厚壁管道施工中的独到优点。
And the design can ensure the stability of diameter and roundness when producing the pipe with thick wall.
特殊设计可以拥有稳定的直径尺寸和圆整度，可以适合生产厚壁管的需要。
The induction heating equipment and heat treatment process of thick-wall pipe were reconstructed.
对厚壁管感应加热设备及热处理工艺进行了重新设计改造。
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