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采用完全热力耦合模型分析轴向载荷变化对搅拌摩擦焊接过程的影响,发现较低的轴向载荷会导致搅拌摩擦焊接无法完成.搅拌摩擦焊接构件上表面材料由于受到搅拌针和肩台旋转的作用,导致上表面材料变形程度较下表面高,材料沿焊缝中心线的变形并非严格对称,前进侧材料的变形程度较后退侧高,搅拌头轴向载荷的增加会减弱这种不对称性.搅拌摩擦焊接过程中的最高温度随轴向载荷的增加而增加,且搅拌头轴向载荷的增加会促使搅拌区附近的温度分布趋于均匀.
The effect of axial load variation on the friction stir welding process was analyzed by a complete thermomechanical coupling model and it was found that the lower axial load would lead to the incomplete friction stir welding.The upper surface of the friction stir welded structure was affected by the rotation of the stirring pin and shoulder , The deformation of the upper surface material is higher than that of the lower surface. The deformation of the material along the weld center line is not strictly symmetrical. The deformation of the material on the forward side is higher than that on the backward side. Increasing the axial load of the stirring head will reduce this asymmetry. The maximum temperature during friction stir welding increases with the increase of axial load, and the increase of the axial load of the stirrer head will promote the temperature distribution near the stir zone to be uniform.