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由中国石油天然气总公司工程技术研究所和天津大学共同承担研究、中油气第八建设公司协助的“热丝填充埋弧焊工艺及装置”于1993年6月29日通过了中油气总公司
By the China National Petroleum Corporation Engineering Institute and Tianjin University jointly assume the research, the eighth construction company assisted by the “hot wire filled submerged arc welding process and device” on June 29, 1993 passed the China National Petroleum Corporation