双金属复合管环焊工艺及接头强度设计现状与趋势

发布时间：2018-08-18 10:36

【摘要】：阐述了双金属机械复合管典型焊接工艺,以及管端封焊和对焊焊接工艺的优点、应用案例和失效案例,认为封焊、过渡焊是此类工艺的质量薄弱点。分析了管端堆焊及其施工对焊技术的研究现状、发展趋势和应用案例,结果表明:采用同种合金焊接材料完成焊缝打底、填充和盖面等的连接方式,可以避免封焊、过渡焊等形成的缺陷和应力。该工艺成功应用于海底天然气开发用双金属复合管焊接,是今后双金属复合管管端加工和施工对焊的重要发展趋势和方向。此外,研究了双金属复合管环焊接头强度匹配设计、接头缺陷容限设计等现状与趋势,结果表明:目前尚无统一的焊接接头强度设计和容限设计理论,双金属复合管管道系统在线检测、腐蚀评价、寿命预测以及管道修复等技术是未来的重要研究方向。
[Abstract]:This paper describes the typical welding process of bimetallic mechanical composite pipe and the advantages of pipe end seal welding and butt welding. The application cases and failure cases show that sealing welding and transition welding are the quality weakness of this kind of process. The research status, development trend and application cases of pipe end surfacing welding and its construction butt welding technology are analyzed. The results show that welding sealing can be avoided by using the same alloy welding materials to complete weld bottom, fill and cover, etc. Defects and stresses formed by transition welding etc. The process has been successfully applied to the welding of bimetallic composite pipe for submarine natural gas development. It is an important development trend and direction of the bimetallic pipe end processing and construction butt welding in the future. In addition, the present situation and trend of strength matching design and defect tolerance design of bimetallic composite pipe ring welding joint are studied. The results show that there is no unified theory of strength design and tolerance design for welded joint. On-line detection, corrosion evaluation, life prediction and pipeline repair of bimetallic composite pipe system are important research directions in the future.
【作者单位】：中国石油集团石油管工程技术研究院/石油管材及装备材料服役行为与结构安全国家重点实验室;北京隆盛泰科石油管科技有限公司;
【基金】：陕西省青年科技新星项目“大口径管材小半径无模热弯截面质量预测与缺陷控制”,2015KJXX-73
【分类号】：TE973.3

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