國標(biao)三(san)通(tong)用(yong)(yong)(yong)(yong)在管道有(you)分(fen)支的(de)地方,因其使用(yong)(yong)(yong)(yong)方便簡單,在化工、民用(yong)(yong)(yong)(yong)建筑、機械制造、船舶(bo)工業等應用(yong)(yong)(yong)(yong)廣(guang)泛。對于采用(yong)(yong)(yong)(yong)無縫管制造國標(biao)三(san)通(tong)來講,目前(qian)通(tong)常所采用(yong)(yong)(yong)(yong)的(de)工藝有(you)液壓(ya)脹形和熱壓(ya)成形兩種。
國(guo)標三(san)通(tong)的(de)設備:在管道上(shang)安置(zhi)頂(ding)出(chu)裝置(zhi),其裝置(zhi)包括金(jin)(jin)屬棒(bang)、頂(ding)壓器、換向(xiang)器、支架(jia)等;將金(jin)(jin)屬棒(bang)加(jia)熱,利用千斤頂(ding)及金(jin)(jin)屬棒(bang)向(xiang)外(wai)頂(ding)出(chu)時,管壁材料自然(ran)向(xiang)外(wai)翻出(chu)形成的(de)冷拔(ba)三(san)通(tong)毛坯;然(ran)后將 長(chang)度相應規格的(de)管段焊接在頂(ding)出(chu)形成的(de)國(guo)標三(san)通(tong)毛坯上(shang),生產(chan)出(chu)終產(chan)品。
國(guo)標(biao)三通三個出口的口徑全(quan)一樣(yang)的,是(shi)等徑國(guo)標(biao)三通,而(er)兩頭一樣(yang)大,中間小的國(guo)標(biao)三通,叫做異徑國(guo)標(biao)三通。執(zhi)行(xing)GB/T12459-2005。材質(zhi)有(you)碳鋼(gang),合金鋼(gang)及不銹鋼(gang)等。