焊接工艺参数对锚拉管焊接残余应力的影响

发布时间：2018-05-04 19:11

本文选题：锚拉管 + 焊接残余应力　；参考：《上海交通大学学报》2017年08期

【摘要】：为了实现不同焊接工艺参数下残余应力的预测,进一步优化相应的焊接工艺,采用数值模拟与试验对比方法研究锚拉管焊接残余应力.利用有限元软件ANSYS模拟T形焊接试件残余应力并与实测应力值作对比,验证了数值方法的准确性.在此基础上,对不同的焊接电压、电流和速度等焊接工艺参数下的锚拉管残余应力进行数值模拟和对比分析.结果表明,锚拉管焊接残余应力与焊接电压、电流呈正相关关系,焊接电流对焊根处纵向残余应力峰值影响较大;与焊接速度呈负相关关系,速度越大,沿焊缝方向上的纵向残余应力明显减小,分布更加均匀,当达到5mm/s时,会出现锚拉管未完全焊,应力峰值位置发生偏移的情况;焊接速度可作为主要的控制参数.基于分析结果,提出锚拉管断面纵向残余应力分布简化模型,以便给锚拉管焊接残余应力研究提供参考.
[Abstract]:In order to predict the residual stress under different welding parameters and further optimize the welding process, the numerical simulation and experimental comparison method were used to study the welding residual stress of anchor tubing. The finite element software ANSYS is used to simulate the residual stress of T-shaped welded specimens and the numerical results are compared with the measured values. The accuracy of the numerical method is verified. On this basis, numerical simulation and comparative analysis of the residual stress of anchor tubing under different welding parameters such as welding voltage, current and speed are carried out. The results show that the welding residual stress has a positive correlation with the welding voltage and current, and the welding current has a significant effect on the peak value of the longitudinal residual stress at the welding root, and negatively correlated with the welding speed, the faster the welding speed is, the greater the welding speed is. The longitudinal residual stress along the weld direction is obviously reduced and the distribution is more uniform. When 5mm/s is reached, there will be incomplete welding of the anchor tubing, and the peak stress position will be offset, and the welding speed can be taken as the main control parameter. Based on the analysis results, a simplified model of longitudinal residual stress distribution is proposed for the study of welding residual stress.
【作者单位】：武汉理工大学交通学院;三峡大学土木与建筑学院;中交第二航务工程局有限公司;
【基金】：国家自然科学基金项目(51178361) 甘肃省交通运输厅科技项目[2016]74号资助
【分类号】：TG44

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