文献类型：期刊文献

英文题名：A comparison between fracture toughness at different locations of SMAW and GTAW welded joints of primary coolant piping

作者：Yu, Weiwei[1,2];Fan, Minyu[2];Shi, Jinhua[2];Xue, Fei[2];Chen, Xu[1];Liu, Hui[3]

机构：[1]Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China;[2]Suzhou Nucl Power Res Inst, Suzhou 215004, Peoples R China;[3]East China Univ Sci & Technol, Sch Pharm, Shanghai 200237, Peoples R China

年份：2018

卷号：202

起止页码：135

外文期刊名：ENGINEERING FRACTURE MECHANICS

收录：;EI(收录号：20183905868138);WOS:【SCI-EXPANDED(收录号:WOS:000449274300009)】；

基金：The authors gratefully acknowledge financial support for this work from the National Natural Science Foundation of China (No. 51435012, 51505325), Natural Science Foundation of Jiangsu Province (BK20171223, BK20150280) and the Open Research Funds for the Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering (No. NJ20170012).

语种：英文

外文关键词：Gas tungsten arc welding (GTAW); Shielded metal arc welding (SMAW); Micro-hardness; Fracture toughness; Primary coolant piping

摘要：Two primary coolant pipes were narrow-gap multipass circumferentially butt welded by gas tungsten arc welding (GTAW) and shielded metal arc welding (SMAW) methods separately and then subjected to micro-hardness tests to distinguish the base metal (BM), heat affected zones (HAZs), fusion zones (FZs) and weld metal (WM). Subsequently, uniaxial tensile tests were performed with a 3D DIC system to investigate the strain evolution of each area in GTAW and SMAW welded joints and to compare respective tensile properties. The fracture toughness has been investigated at the above four different locations of the SMAW and GTAW welded joints. Then the 0.2 mm offset line method and the stretch zone width method have been both employed to determine the critical initial fracture toughness J(i). The results indicate that the fusion zones (FZs) have the worst fracture toughness compared with other locations over both two types of weld joints. In addition, the GTAW welded joints have a better comprehensive performance than the SMAW welded joints.