铝合金电阻点焊接头质量特征信息分析
Analysis of quality characteristics information of aluminum resistance spot welding joint
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摘要: 为了研究电阻点焊接头质量,分析了铝合金2A12电阻点焊过程中的电极力、电极位移和焊接电流三组动态数据,并绘制了动态数据三曲线图.结果表明,在焊接过程中合格焊点的电极力曲线变化情况是:开始有轻微下凹现象,然后是小幅增长并伴随轻微波动,最后有向下倾斜的趋势,每个阶段不足或过度,则有不合格焊点产生.电极位移曲线的上升率直接与能量供应率有关,电极位移最大时刻与加载锻压力时刻之间的曲线形状与金属熔化量和软化区大小有关.Abstract: In order to study the quality of resistance spot welding joint, three groups of dynamic data were analyzed and drew to curve during the resistance spot welding of aluminum alloy 2A12, namely, the electrode force, the electrode displacement and welding current. The results show that the change tendency of the electrode force was depressing slightly at the beginning of the welding, then a small increase with slight fluctuations, and finally a downward-sloping trend. Unqualified weld was formed when the force is under or over the normal stress at each stage. The rising rate of the displacement curve is related to the welding current and the energy efficiency. The shape of the displacement curve between the maximum displacement and the loading forging force is related to the amount of melting metal and the size of the softening zone.
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Keywords:
- quality of spot welding /
- electrode displacement /
- electrode force /
- welding current
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