文献类型：期刊文献

英文题名：Impact of different welding processes on the pneumatic bulge test at a high temperature: Gas Tungsten Arc Welding and Laser Beam Welding

作者：Guo, Zi-Jian[1];Shi, Jin[1,2];Chang, Jing-Huan[1];Wang, Jia-Xing[1];Zhou, Yun[3];Wen, Jian-Feng[1,4];Tu, Shan-Tung[1,4]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety MOE, Sch Mech & Power Engn, Minist Educ, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]China Special Equipment Inspect & Res Inst, Bldg 2, Beijing 100029, Peoples R China;[3]Special Equipment Safety Supervis Inspect Inst Jia, 107 Caochangmen St, Nanjing 210036, Peoples R China;[4]Shanghai Inst Aircraft Mech & Control, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2026

卷号：219

外文期刊名：INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING

收录：;EI(收录号：20254619505916);WOS:【SCI-EXPANDED(收录号:WOS:001622491500001)】；

基金：The authors are grateful for the supports provided by the National Natural Science Foundation of China (52122506, 52475156, 52130511) , the National Key Research and Development Program of China (2024YFF0618904) , the Shanghai Gaofeng Project for University Academic Program Development and the Program of Oriental Scholars of Shanghai Universities. The authors are also grateful to Jian-Qiang Zhu, from BMC Sealing Technology (Suzhou) Co. Ltd for experiment assistance.

语种：英文

外文关键词：Pneumatic bulge test; High temperature; Microstructure; Gas Tungsten Arc Welding; Laser Beam Welding

摘要：Pneumatic bulge test (PBT), as a novel small specimen testing method, demonstrates significant potential for assessing mechanical properties of materials. The current method necessitates welding to ensure stable loading of pneumatic pressure. However, the influence of the welding process on PBT test results has not been effectively evaluated. This study examines the impact of this factor by analyzing the microstructure of welded joints between the specimen and the lower holder. It also evaluates the effects of Gas Tungsten Arc Welding (GTAW) and Laser Beam Welding (LBW) on SUS 304 specimens tested at 600 degrees C, comparing their pressure-deflection (P-D) curves with finite element simulations that exclude welding. The results reveal that both welded specimens ruptured at the center, but LBW curves closely matched simulations, in contrast to those for GTAW. This discrepancy is explained by morphological analysis, which indicates that GTAW joints are wider and deeper due to lower energy density and slower cooling, with LBW joint width and depth being 34.8 % and 45.9 % of those of GTAW joints. Additionally, LBW joints exhibit fine columnar dendrites and significant carbide precipitation, while GTAW joints show coarser grains and a broader heat-affected zone. Moreover, hardness tests reveal GTAW joints are similar to 50 % harder with steeper gradients, leading to stronger constraints at the edges of GTAW specimens compared to LBW-welded specimens. Consequently, the GTAW specimens require greater deformation resistance during loading, resulting in higher P-D curves. These findings suggest that LBW is likely more favorable than GTAW for PBT tests.