CO2焊接过程熔滴过渡频率的Fuzzy/PID控制

在单片机控制ＩＧＢＴ逆变电源的基础上，建立ＣＯ２焊接过程熔滴过渡频率的Ｆｕｚｚｙ／ＰＩＤ控制系统，并对其系统结构、控制原理和控制算法进行了描述。本系统通过调节波形参数从而改变燃弧时间来控制熔滴守渡的频率，当熔滴过渡频率的误差较大时，采用Ｆｕｚｚｙ控制方法，而在误差较小时采用控制方法。本系统还在Ｆｕｚｚｙ控制过程中引入了控制参数自学习功能，保证了不同焊接规范时控制系统的动态响应和静态精度。焊接试验表

Fuzzy and PID Control of Droplet Transfer Frequency in CO2 Welding Process

On the basis of microcomputer controlled IGBT inverter power source,the fuzzy and PID control system of droplet transfer frequency was developed in CO 2 welding process.The system structure,control principle and control algorithm were introduced in this paper.By adjusting the wave parameters and thereby changing arc time,droplet transfer frequency was controlled.The fuzzy control method was adopted for bigger error of droplet transfer frequency,while the PI control method was adopted for smaller error.The control parameter self study function was realized in fuzzy control process.Good dynamic responsibility and static precision were ensured when welding condition and welding parameters were changed.Welding experiments showed that this system ensured the stability of droplet transfer frequency by automatically adjusting wave parameters when the wire extension varied in welding process,and the control effect didn't depend on the preset value of the control parameters.