welding seam No
... welding screen电焊遮光罩 welding seam No焊缝编号 welding sequence焊接程序; 焊接次序; 焊接顺序 ...
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焊缝编号应根据管线介质流向进行编号，原则上应先主管后支管。
Welding seam should be numbered according to pipeline medium set, in principle, main pipe prior to branch pipe.
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