铝合金搅拌摩擦焊温度场的数值模拟

Numerical Simulation of Thermal Field of Friction Stir Welding for Aluminum Alloy

为了研究搅拌摩擦焊在焊接过程中温度场的变化情况,文中根据摩擦学原理,建立了搅拌摩擦焊热输入的数学模型,利用ANSYS有限元分析软件计算出瞬态温度场分布,并得到了试板上任意一点温度随时间的变化曲线。通过将计算结果与实验值比较,验证了计算结果的正确性。结果表明:搅拌摩擦焊是一种固态焊接方法,而且搅拌头前面的高温区域要比后方窄;在板厚方向上,温度是由表面向底面依次降低的;对于与焊缝中心等距离的点,后方比前方达到的温度最高值要稍高。

To understand the temperature distribution in friction stir welding, a numerical model is established based on the principle of friction. By means of FEA software ANSYS, the distribution of temperature is calculated and the thermal cycle curve at any position of the test plate is obtained.Compared with the experiment, the result from calculation is accurate. Results show that the friction stir welding is a solid state welding. The high temperature region ahead of the stir pin is narrower than that behind. In the direction of thickness, the temperature decreases from the top to the bottom. For the points with the same distance to the weld line, the temperature in the back zone is slightly higher than that in the front zone.