Bututun LSAW (Bututun Lantarki na Arc-welding Pipe), kuma ana kiransa bututun SAML.Yana ɗaukar farantin karfe a matsayin ɗanyen abu, a ƙera shi ta na'urar gyare-gyare, sannan a yi walda mai ɓarna mai fuska biyu.Ta wannan tsari da LSAW karfe bututu zai samu kyau kwarai ductility, weld tauri, uniformity, ...
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