ERW焊管焊缝冲击韧性的影响因素解析
Analysis of Factors to Welded Seam’s Impact Toughness for ERW Pipe
崔延，聂向晖，李云龙，赵文轸
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作者单位：西安交通大学金属材料强度国家重点实验室；中国石油集团石油管工程技术研究院；中国石油集团石油管工程技术研究院；西安交通大学金属材料强度国家重点实验室
中文关键字：ERW焊缝；冲击韧性；夹杂物；结构参数；正火温度
英文关键字：Welded seam; Impact toughness; Inclusion; Structural parameters; Normalizing temperature
中文摘要：焊缝的冲击韧性偏低是制约ERW焊管广泛应用的主要原因之一。本文以X60级焊管为研究对象，分析影响ERW焊缝冲击韧性的因素，包括焊管母材质量、焊接工艺以及焊后正火等三个方面。焊接所用钢板中的夹杂物严重损害ERW焊缝冲击韧性，所以要尽可能提高母材质量；焊接工艺直接决定焊接质量，通过测量焊缝结构参数可以制定合理的焊接工艺；焊后焊缝的正火可以很好改善焊缝冲击韧性，通过对比发现900℃~930℃之间的正火最为合适。
英文摘要：Low impact toughness of welded seam for ERW Pipe restricts its wide application for a long time. X60 pipe is researched in this paper, and effecting factors of impact toughness for ERW weld seam were analyzed, which includes the quality of parent metal, welding process and normalizing after weld. Inclusions in those steel plates used in the ERW weld do harm to the impact toughness of welded seam, so the quality of parent metal should be paid more attention. Welding process determines the welding quality directly. Welding process can be developed reasonably by measuring structural parameters of welded seam. Normalizing after weld significantly improves the impact toughness of the weld seam, and normalization in the temperature of 900 ℃ ~ 930 ℃ is the most appropriate.