文献类型：期刊文献

英文题名：Cracking failure analysis on a high-frequency electric resistance welding pipe in buried fire water pipeline

作者：Xia, Zilong[1];Huang, Yichang[2];Zhong, Jiru[1];Guan, Kaishu[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Shanghai Inst Special Equipment Inspection & Tech, Shanghai, Peoples R China

年份：2023

卷号：146

外文期刊名：ENGINEERING FAILURE ANALYSIS

收录：;EI(收录号：20230513498597);WOS:【SCI-EXPANDED(收录号:WOS:000927106300001)】；

基金：Acknowledgement This project is funded by the National MCF Energy R&D Program of China (2022YFE03120000) .

语种：英文

外文关键词：Buried fire water pipeline; Cracks; High -frequency electric resistance welding

摘要：Leakage of a buried fire water pipeline occurred after in service of 15 years. It was manufactured from a Q235B carbon structural steel plate by high-frequency electric resistance welding. The water pressure increased from 0.8 MPa at a normal operating condition to 1.2 MPa at the tube burst moment. Cracks propagate along the weld and incomplete fusion defects are observed. This paper aims to explore the cracking failure through a combination method of experimental tests and theoretical analysis. The metallographic analysis clearly shows that the crack is located in the fusion zone and grains are coarse in that zone. Mechanical property tests indicate tensile prop-erties of the anti-corrosion layer meet requirements. Finite element analysis reveals that the pipeline with an incomplete fusion can safely operate under a pressure of 0.8 MPa, while fracture occurs under the pressure of 1.2 similar to 1.3 MPa. The results indicated that the deep unfused defect of the welded joint was the root cause of cracking, and selective seam weld corrosion also played an important role. The failure progress and mechanism were discussed in details.