Ni aaye ti liluho epo ati kanga epo, giga-igbohunsafẹfẹ ina resistance welded casing (ti a tọka si bi ERW casing) ni akawe pẹlu casing laisiyonu jẹ iṣiro iwọn giga, lile lile weld, anti-extrusion ti iṣẹ giga, ati awọn anfani idiyele kekere, eyiti ti wa ni lilo pupọ ni ile-iṣẹ ajeji ...
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