A study was made of the welding procedure for X70-L245 butt joint of pipeline steel.

针对不同强度级别的管线钢x 70和L245对接的焊接工艺进行了研究。

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A study was made of the welding procedure for X70-L245 butt joint of pipeline steel.

针对不同强度级别的管线钢x 70和L245对接的焊接工艺进行了研究。

youdao