焊接工艺参数对锚拉管焊接残余应力的影响

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.

Effects of Welding Process Parameters for Welding Residual Stress of Anchor Pipe

In order to predict residual stress under different welding parameters and further optimize the welding procedure, the welding residual stress of anchor pipe was studied by numerical simulation and experimental comparison. The welding residual stress of T joint welding specimen was simulated with the finite element software ANSYS, and the accuracy of the numerical method was verified by comparing with the measured stress value. On this basis, the welding residual stress of anchor pipe was compared and analyzed in different welding process parameters like welding voltage, welding current and welding speed by simulation. The results show that welding residual stress of anchor pipe is positively correlated with welding voltage and welding current, and the longitudinal residual peak stress at root is greater influenced by welding current. Welding residual stress is negatively correlated with welding speed, which means when welding speed is higher, the longitudinal residual stress along the weld direction reduces obviously and its distribution is more uniform. When welding speed reaches 5mm/s, anchor pipe is not fully welded and the position of peak stress moves, so welding speed can be used as the main control parameter. Based on the results, the simplified residual stress distribution model of anchor pipe section is established, providing a reference for research of the welding residual stress.