step by step welding
分步焊接
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
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