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采用彩泥对搅拌摩擦焊塑性流动进行观察,据焊缝内部材料受力情况,分析了焊缝各截面流动特征产生的成因。论文将轴肩范围内的焊缝划分为搅拌挤压区和塑性变形区,焊缝中下部搅拌挤压区内,搅拌针周围大部分材料绕搅拌针呈螺旋型搅拌迁移,填充后方瞬时空腔,小部分材料被迫逆时针向后方迁移;塑性变形区内,大部分材料绕搅拌针顺时针由返回边向搅拌针后方迁移,少量前进边的材料被迫逆时针流向搅拌针后方。焊缝上部搅拌挤压区内,搅拌针前方的材料首先绕搅拌针旋转迁移填充后方瞬时空腔,并在轴肩作用下与塑性变形区内彩泥一道经历一种连续“涂抹式”迁移运动。
The color flow was observed by friction stir welding, and the causes of the flow characteristics of each section of the weld were analyzed according to the internal force of the weld. In this paper, the weld within the shoulder area is divided into the agitation extrusion zone and the plastic deformation zone. In the middle and lower part of the weld, most of the material around the agitation needle is stirred and migrated around the agitation needle, filling the rear instantaneous cavity , A small part of the material is forced to migrate counterclockwise to the rear; most of the material in the plastic deformation zone migrates clockwise from the return side to the rear of the stirring pin, and a small amount of the forward side material is forced to flow counterclockwise to the rear of the stirring pin. In the upper part of the weld, the material in front of the stirring pin is firstly rotated around the stirring pin to fill the rear instantaneous cavity, and undergoes a continuous “smearing” with the color mud in the plastic deformation zone under the action of the shoulder. Migration campaign.