搅拌摩擦焊接过程温度场动态仿真

推导了一种简易直观的搅拌摩擦焊接热源模型,并将模型应用于焊接过程温度场动态仿真,得到了焊接过程中不同时刻和位置处的热循环曲线,确立了温度场在时间和空间上的分布规律,并研究了不同焊接工艺参数时的温度场.结果表明:焊接最高温度为496.5℃,低于铝合金的熔点;沿焊缝不同位置处的温度值依次从初始温度迅速升高到最高温度500℃左右,然后又缓慢回复到初始温度附近;离焊缝越近,温度升高得越剧烈,最高温度越高;焊接工艺参数对搅拌摩擦焊接过程温度场影响显著.

Dynamic Simulation of Temperature Field During Friction Stir Welding

A simple and visual calorigenic model was developed via FEM for FSW (friction stir welding) process, which was applied to the dynamic simulation of temperature field in the process. Then, the thermal cycling curves at different time and different positions are given to make sure of how the temperature field is space-time distributed with different welding parameters. The results indicated that the maximum welding temperature is 496.5°C, i.e., lower than the melting point of Al-alloy. The temperature at different positions along the welded seam increases rapidly from its initial value to about 500°C then reverts slowly to the initial one. The nearer the position to the welded seam, the quicker the temperature rise and the higher the maximum temperature available. The temperature field is affected greatly by welding parameters in FSW process.