AZ31镁合金搅拌摩擦点焊
Friction stir spot welding of AZ31 Mg-alloy
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摘要: 研究了搅拌头旋转频率以及停留时间对AZ31镁合金搅拌摩擦点焊接头力学性能的影响.随着旋转频率的增大,不同搅拌针条件下,AZ31搅拌摩擦点焊接头的力学性能均呈现先增大后减小的趋势.随着停留时间的延长,AZ31搅拌摩擦点焊接头的力学性能先增大随后在一定范围内波动.结果表明,结合宽度是影响搅拌摩擦点焊接头力学性能的重要因素,结合宽度越大,点焊接头的力学性能越好;此外,上下板之间界面特征对搅拌摩擦点焊接头的力学性能也具有重要的影响.Abstract: The influences of tool rotational speed and dwell time on the mechanical properties of AZ31 friction stir spot welds were investigated.Along with the increase in tool rotational speed,the mechanical properties of AZ31 friction stir spot welds which were made by different tool designs increased first and then decreased.Along with the increase of dwell time,the mechanical properties of AZ31 friction stir spot welds increased first and then kept relatively constant.Bonded width affected the properties of friction stir spot welds significantly.The bigger the bonded widths,the better the properties of the friction stir spot welds were.In addition,the feature of the interface between the upper and the lower sheet also had an important influence on the properties of AZ31 friction stir spot welds.
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