closed weld
... circular weld环形焊缝 circumferential weld环缝; 环焊缝 cleft weld裂口焊 closed weld底边无缝焊; 无间隙焊缝 closed-chamber fusion weld闭室熔焊 ...
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无间隙对接焊缝 unspaced butted weld
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