暖气T型管道焊接三维温度场及热应力场分析  

Analysis on Three-dimensional Temperature Field and Thermal Stress Field of T-shaped Pipe Used in Heater

作　　者：李丙如 周建平[1] 许燕[1] 李智钟[1] 

机构地区：[1]新疆大学机械工程学院,乌鲁木齐830047

出　　处：《机械设计与研究》2016年第4期178-182,共5页Machine Design And Research

基　　金：国家自然科学基金资助项目(51365053);新疆自治区科技支疆项目(201491124);新疆自治区研究生创新项目(XJGRI2015027)

摘　　要：对全数字自动焊接设备下的暖气T型管道焊接进行数值模拟研究,采用数学解析与试验相结合的方法验证了温度场模拟结果,并分析了不同焊接路径下的热应力。结果表明:热源选择直接影响焊接时的最高温度,而散热函数直接影响焊后降温速率。双椭球热源焊接下的母材的最高温度及冷却速率与数学解析结果相吻合,温度循环曲线与热成像仪实验趋势一致。热应力在焊缝中心线很小,向焊缝融合线增加至最大应力,达到材料的屈服强度。焊接路径及装夹约束对焊接应力应变均有影响,本文根据该分析结果合理选择焊接工艺运用于暖气管道T型管焊接。This paper presents a numerical simulation of T-shaped pipe under NC welding mechine. The results are verified by the combination of mathematical analysis and experiments. Thermal stress in different welding trajectories is studied. The results show that the maximum temperature of the welding is directly affected by heat source model, and the cooling rate after welding is directly affected by heat dissipation function. The highest temperatureand and temperature cooling rale of the workpice is very coincided with mathematical formula. The trend of temperature cycling curve and the thermal imager experiment is the same. Thermal stress in the center line of molten zone is less and the stress in the edge of molten zone is great, which is slosed to its yield stress. The welding trajectories and the loading restriction both have influence on the welding stress and strain. According to the results of this analysis, the welding process is reasonably selected and is widely used in the welding of T-shaped pipe.

关 键 词：T型管焊接 温度场 热应力场 焊接路径 

分 类 号：TG402[金属学及工艺—焊接]