CO_2焊接过程熔滴过渡频率的Fuzzy/PID控制  

Fuzzy and PID Control of Droplet Transfer Frequency in CO_2 Welding Process

作　　者：韩赞东[1] 都东[1] 张人豪[1] 孙建广[2] 杜占平[2] 

机构地区：[1]清华大学,北京100084 [2]河北工业大学

出　　处：《焊接学报》2000年第1期21-24,共4页Transactions of The China Welding Institution

摘　　要：在单片机控制IGBT逆变电源的基础上 ,建立了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过渡的频率 ,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PI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。焊接试验表明 ,当焊接过程中干伸长发生变化时 ,控制系统能够自动调整波形参数 ,保持熔滴过渡频率的稳定 。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.

关 键 词：CO2焊接 熔滴过渡频率 模糊控制 PID控制 

分 类 号：TG444.73[金属学及工艺—焊接] TG409