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通过观测铝合金焊缝接头显微组织形貌与塑性金属组织的流线形,并结合对搅拌过程中搅拌针周围塑性金属的受力情况分析,初步构建了搅拌摩擦焊塑性金属流动行为模型,揭示了焊接缺陷的产生原因和性能薄弱区域。研究结果表明,水平方向上将塑性金属的流动迁移过程包括5个同时进行的过程,其中前进侧切削金属较少,在后退侧,搅拌针焊接前进方向和旋转方向相反,切削金属量达到最大值。厚度方向上由于轴肩的顶锻作用,上部塑性金属向下迁移,在焊缝中部堆积形成洋葱环。实际流动过程是水平和厚度方向流动行为的叠加。
By observing the microstructure of aluminum alloy weld joint and the streamline shape of the plastic metal structure, combined with the analysis of the force of the plastic metal around the stirring pin during the stirring process, the flow behavior model of the friction stir metal plastic was preliminarily established, Revealed the causes of welding defects and weak performance areas. The results show that the flow direction of the plastic metal in the horizontal direction includes five simultaneous processes, of which the cutting side of the forward side is less, on the backward side, the direction and direction of rotation of the welding tip are opposite, and the amount of cutting metal reaches the maximum . Due to the shoulder upsetting action in the thickness direction, the upper plastic metal migrates downwards, forming an onion ring in the middle of the weld. The actual flow process is a superposition of flow behavior in the horizontal and thickness directions.