root pass welding 中文意思是什麼
root pass welding
解釋
根部焊道焊接-
The gmaw short - arc process shall not be used for welding socket welds or the root pass of o - lets and branch connections
熔化極氣體保護焊-短弧工藝不適用於承插焊接或出口和分支連接的根部焊道。
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