论文部分内容阅读
针对细丝短路过渡焊 ,采用以实现最高短路过渡频率为目标的自寻优模糊控制 ,可以使电弧电压与唯一设定值焊接电流形成优化匹配获得最高短路过渡频率 ,达到稳定熔滴过渡、减少飞溅和改善成形的目的。但试验发现这一控制策略用于半短路过渡焊 ,则无论电流选多大 ,电弧电压常维持在 2 0V左右 ,所焊焊缝熔宽窄 ,余高大 ,熔深浅。显然 ,对于半短路过渡焊的电弧电压仍采用以实现最高短路过渡频率为寻优目标的控制策略是不够全面的。针对这一情况 ,研制了一种以可编程控制器 (PLC)为核心器件 ,通过自主开发软件自动实现对半短路过渡焊电弧电压寻优的智能控制。系统以实现较高短路频率和较长燃弧占空比为复合寻优目标 ,对电弧电压进行优选法和变步长法分段自寻优 ,寻优后的电弧电压与设定的焊接电流形成优化匹配 ,获得稳定的半短路过渡过程
For filament short-circuit transition welding, the self-optimizing fuzzy control with the goal of achieving the highest short-circuit transition frequency can be used to optimize the arc voltage and the welding current with the only set value to obtain the highest short-circuit transition frequency, achieve stable droplet transfer and reduce Splash and improve the forming purpose. However, the test found that this control strategy for semi-short circuit transition welding, no matter how large current selection, arc voltage often maintained at 20V or so, the welding weld melt width is narrow, I was tall, shallow melt depth. Obviously, it is not enough to adopt the control strategy that the arc voltage of half-short-circuit transition welding is still the optimization target to achieve the highest short-circuit transition frequency. In response to this situation, an intelligent control system based on programmable logic controller (PLC) as the core device to automatically optimize the arc voltage of semi-short circuit transition welding is developed. In order to achieve higher composite short-circuit frequency and longer arcing duty cycle, the system performs the optimization of arc voltage and variable-step-length method to segment the self-optimization. The optimal arc voltage and the set welding current are formed Optimize the match, get a stable half-short transition process