工业纯铝焊接热影响区晶粒生长的模拟

Simulation of grain growth in the HAZ of industrial pure aluminium

结合焊接工艺试验和热模拟试验,运用蒙特卡罗(MC)技术模拟了工业纯铝L1060焊接热影响区(HAZ)晶粒生长过程。首先应用试验和统计学的方法确定了工业纯铝L1060晶粒生长的动力学模型,然后计算了焊接热循环,同时基于蒙特卡罗技术编制了模拟程序,最后在不同焊接热输入情况下,模拟了晶粒生长过程。模拟结果与试验结果非常接近,为评定焊接工艺和材料焊接性提供了依据。

In the paper, Monte Carlo (MC) technology with welding experiments and thermal simulation experiments were introduced to simulate the grain growth process in welding heat affected zone(HAZ) of industrial pure aluminium. Firstly, a kinetic model was defined by experimental and statistical method. Then the thermal cycle was calculated and at the same time the simulation program was worked out based on MC technology. Lastly, the grain growth process in HAZ was simulated during different welding heat input, which has great influence on grain growth in HAZ. The result of the simulation demonstrates the grain growth process dynamically and embodies the 'thermal pin effect'. Good agreement between MC simulation results and the experimental results were obtained, which can provide a reliable evidence for evaluating the welding craft and the weldability.