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为模拟A356铝合金汽车轮辋的搅拌摩擦焊接,利用移动坐标系坐标转换方法,基于傅里叶定律定义了引入焊接速度项的热传导控制方程以降低建模难度。摩擦产热采用剪切摩擦模型,根据能量守恒定律,通过微积分方程并考虑了功能转化的效率,合理推导出轴肩与搅拌针作用域的产热公式,并根据轮辋对称结构简化计算模型,进而建立轮辋的搅拌摩擦焊接传热模型。通过相同焊接工艺条件下轮辋焊缝轮廓形貌模拟与试验结果对比,验证了建立的搅拌摩擦焊接传热模型的有效性和准确性,可用于优化轮辋焊接工艺参数和研究轮辋搅拌摩擦焊接机制。
In order to simulate the friction stir welding of the rim of A356 aluminum alloy car, the heat transfer control equation with the introduction of welding speed was defined based on Fourier’s law to reduce the modeling difficulty. According to the law of conservation of energy and considering the efficiency of function transformation, the heat production equation of the shaft shoulder and the stirring rod is deduced reasonably according to the law of conservation of energy and the calculation model is simplified according to the rim symmetry structure. And then establish the rim friction stir welding heat transfer model. The simulation and experimental results of rim weld seam profile under the same welding conditions are compared to verify the validity and accuracy of the established friction stir welding heat transfer model, which can be used to optimize the rim welding process parameters and research the friction stir welding mechanism of rim.