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采用计算流体力学软件FLUENT建立了基于有限体积法的二维塑性材料流动模型,对2024铝合金搅拌摩擦焊接过程中材料的塑性流动进行数值模拟,研究了焊接参数影响焊缝区域在沿垂直焊件表面方向上材料塑性流动特征的规律。结果表明,在紧靠搅拌头区域材料的塑性流动最剧烈,速度明显高于距搅拌头较远的区域,且材料在回撤边发生绕流现象;随着搅拌头旋转速度的增加,搅拌头附近区域材料流动速度增加,且材料流动较剧烈的区域明显扩大;焊接速度的提高对搅拌头及其附近区域材料的流动影响不大。
The two-dimensional plastic material flow model based on finite volume method was established by computational fluid dynamics software FLUENT. The plastic flow of 2024 aluminum alloy during friction stir welding was numerically simulated, and the influence of welding parameters on the weld- Laws of material plastic flow in surface direction. The results show that the plastic flow in the area close to the mixing head is the most intense and the velocity is obviously higher than that in the area far away from the mixing head, and the material flows around in the retracting side. With the rotation speed of the mixing head increasing, In the vicinity of the material flow rate increases, and the material flow significantly increased the area significantly increased; welding speed increase the mixing head and the material flow in the vicinity of little effect.