Yang Xiaoyu, Yan Guizhen, Xiu Yanfei, Yang Zhongwei, Wang Gang, Liu Wei, Li Shaohua, Jiang Wenchun
Shandong nuclear power equipment manufacturing co., LTD, Shandong, Haiyang 265118, China.
College of Mechanical and Electronic Engineering, China University of Petroleum (East China), Qingdao 266555, China.
Materials (Basel). 2019 Jul 31;12(15):2436. doi: 10.3390/ma12152436.
A numerical and experimental study of welding temperature distribution and residual stresses in thick welded plates of SA738Gr.B was conducted. Within the framework of numerical investigations, the temperature field of SA738 thick plate welding was simulated and analysed by using 2-D modelling technology. The temperature field was checked by using the thermal cycle curve with the aim of increasing the computational accuracy and efficiency, and the temperature field was verified by using the thermal cycle curve and heat affected zone. The welding stress field was analysed based on the temperature field, and the indentation test method was used to verify the stress field, and the error was controlled to within 12.5%. With the help of a welding model established for SA738Gr.B thick-plate welding the sequence was simulated. Seen from welding sequence 1 to welding sequence 3, transverse stress S11 changed significantly, decreasing by 14% and 17% respectively, adjusting the welding sequence can reduce welding residual stresses.
对SA738Gr.B厚焊接板的焊接温度分布和残余应力进行了数值和实验研究。在数值研究框架内，采用二维建模技术对SA738厚板焊接的温度场进行了模拟和分析。通过热循环曲线对温度场进行校核，以提高计算精度和效率，并利用热循环曲线和热影响区对温度场进行验证。基于温度场分析了焊接应力场，采用压痕试验方法对应力场进行验证，将误差控制在12.5%以内。借助为SA738Gr.B厚板焊接建立的焊接模型，对焊接顺序进行了模拟。从焊接顺序1到焊接顺序3可以看出，横向应力S11变化显著，分别降低了14%和17%，调整焊接顺序可以降低焊接残余应力。
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