挖掘机动臂板焊接温度场模拟及影响因素分析

利用有限元方法对挖掘机动臂平板对接焊温度场进行了分析,采用Goldak椭球热源模型,应用DFLUX子程序定义热源模型的位置、大小、热输入以及焊接速度等参数来模拟瞬态温度场的分布及其变化,在此基础上通过改变焊接热输入、热源模型参数和焊接速度来分析其对温度场分布的影响规律.研究结果表明,由于焊接热源具有集中移动的特点,焊接热源模型参数以及焊接速度对焊缝区和热影响区的温度分布影响比较明显,热输入的变化与最高温度的变化大致呈线性关系.运用有限元法,选取Goldak椭球热源模型通过DFLUX子程序可有效进行挖掘机动臂平板焊接的数值模拟.

Temperature field simulation and impact factor analysis on excavator boom plate welding

The welding temperature field is first analyzed via the finite element method on excavator boom plates.By applying the Goldak’s ellipsoid thermal source model,such parameters as the thermal source position,value,thermal input and welding speed are defined by the DFLUX sub-program,and then simulated on the transit temperature field distribution and variation.Meanwhile,the impact of such parameters on temperature field distribution is analyzed.Finally,it is found from research results that the welding thermal source possesses the concentrated movement property.In this regard,the welding thermal model parameters and speed deliver significant impacts on the temperature distribution of welding line and thermal effect zones with the linear relation between thermal inputs and highest temperatures.Based on the finite element method,the numerical simulation can be effectively conducted on excavator boom plate welding.