Take welding from middle to both ends step by step may have the least deformation, or take welding from one section to another step by step may also reduce the deformation.

从中间向两端逐步退焊法变形最小，采用逐段跳焊法也可以减少变形。

This paper describes the development of high - pressure steel butt welding bends with straight ends.

本文概述钢制对焊高压带直段弯头的开发.