厚壁焊管产品不只种类丰富，而且有关其的制作工艺和成形方法也多式多种多样。大部分状况下，在成形以后一道工艺流程全是对电焊焊接后精轧管再开展一次总长扩径，以发展电焊焊接收形品质。换句话说，扩径加工工艺变成了大口径自缝厚壁焊管生产制造中保证 产品管品质的一道关键工艺流程。

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