点焊热过程双特性融合控制算法

A double-characteristic fusion-control algorithm for resistance spot welding

在协同控制策略基础上,综合运用模糊控制和单片机技术在点焊形核阶段对热量调节算法进行了优化,建立了双特性(优质熔核的动态电流滞后角特性与动态电流特性)监控模式并运用多信息融合技术实现了基于多种监控信息,即电流滞后角增量偏差en与本周波热量调节幅度△mn和下周波热量调节幅度△mn+1与本周波焊接电流偏离程度△In的二次模糊决策法.结果表明,这种监控机制能更好地掌控点焊过程的热量调节方向和尺度,保证焊接熔核质量和焊接时间的一致性.

On the basis of the co-control strategies,the algorithm of heat regulation is optimized for resistance spot welding by use of fuzzy control and single-chip computer technology.The monitoring mode of double-characteristics,dynamic current lag angle characteristic and dynamic current characteristic,is set up,and then the twice fuzzy decision-making method with multi-information fusion technology is applied in monitoring information,such as current lag angle incremental deviation en,heat percentage adjustment increment △mn in present cycle,heat percentage adjustment increment △mn＋1 in next cycle and welding current deviation △In in present cycle.The results prove that this monitoring mechanism not only can be better control the direction and scale of heat regulation,but also can ensure the consistency of the quality of welding nugget and welding time.