X80钢多层焊温度分布对残余应力的影响研究  

Influence of Temperature Distribution to Residual Stress of Multi-layer Welding of Semi-automatic Swing Welding in X80 Steel

作　　者：白芳[1,2] 童莉葛 丁红胜 潘礼庆[4] BAI Fang;TONG Li-Ge;DING Hong-Sheng;PAN Li-Qing(School of Mathematics and Physics,University of Science and Technology Beijing,Beijing 100083,China;School of Energy and Environmental Engineering,University of Science and Technology Beijing, Beijing 100083,China;College of Science,China Three Gorges University,Yichang 443002,China;Pipeline Institute,China Petroleum Pipeline Engineering CO.,LTD,Langfang 065000,China)

机构地区：[1]北京科技大学数理学院,北京100083 [2]中国石油管道局工程有限公司管道学院,廊坊065000 [3]北京科技大学能源与环境工程学院,北京100083 [4]三峡大学理学院,宜昌443002

出　　处：《工程热物理学报》2019年第4期931-937,共7页Journal of Engineering Thermophysics

基　　金：国家重点研发项目(No.2016YFB0601100);国家自然科学基金项目(No.51206010);中央高校基本科研业务费专项资金项目(No.FRF-BD-16-009A)

摘　　要：试验表明,自保护药芯焊丝半自动摆焊焊缝区残余应力分布较复杂,这种复杂性与焊缝各焊层所经历的热循环差异有关,从而影响各焊层的残余应力分布.本文采用SYSWELD焊接模拟软件模拟摆焊半自动焊接工艺热循环曲线,与实验的相对误差范围为1.2%～7.3%。结果表明:峰值温度随着热源与焊缝中心距离增加而减小,冷却时间t_(8/5)、t_(8/3)和t_(6/3)随距离热源从3.0 mm变化至5.1 mm,模拟结果分别增加了1.5 s、5.5 s和6.3 s;摆焊焊接试板横向残余应力在整个焊接过程中变化较大,而纵向残余应力变化不明显;随着焊接层数增加,焊缝中心表面横向和纵向的残余应力存在较大减小,焊缝中心表面横向残余应力降低了300 MPa,纵向残余应力降低了310 MPa。In practice, weld passes undergo different thermal cycles for self-shielded flux-cored wire of semiautomatic welding. Numerous experiments show that the residual stress of welded joints is complex and the distribution of it would be affected by the different thermal cycles of each welding pass. In this study, the thermal cycle curves of swing welding are simulated by SYSWELD welding software,and the relative error between experimental and simulated thermal cycle curves is approximately 1.2% to 7.3%. Results show that the peak temperature decreases with increasing distance from heat source. As the distance from the heat source changes from 3.0 mm to 5.1 mm, the cooling times t8/5, t8/3,and t6/3 are increased by 1.5 s, 5.5 s, and 6.3 s, respectively. The transverse residual stress of the welding plate exhibits great variation during welding, but the longitudinal residual stress changes insignificantly. With the increase in weld passes, the transverse and longitudinal residual stresses of the center surface of welded joints decrease apparently. The transverse and longitudinal residual stresses are reduced by 300 MPa and 310 MPa, respectively.

关 键 词：摆焊 管线钢 热循环 残余应力 实验 

分 类 号：TK124[动力工程及工程热物理—工程热物理]