ERW jẹ ina-resistance welded, irin pipe, Resistance welded irin pipe ti pin si paṣipaarọ ti welded irin pipe ati DC welded, irin pipe ni meji awọn fọọmu. Alurinmorin AC ni ibamu pẹlu awọn igbohunsafẹfẹ oriṣiriṣi ti pin si alurinmorin igbohunsafẹfẹ kekere, IF alurinmorin, alurinmorin ti ultra-IF ati giga-fr…
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