短路过渡焊丝伸出长度适应性数字模糊控制系统  

Wire Extension Adaptability Digital Fuzzy Control System for CO_2 Short-circuit Welding

作　　者：冯曰海[1] 刘嘉[2] 殷树言[2] 王克鸿[1] 

机构地区：[1]南京理工大学材料科学与工程系,南京210094 [2]北京工业大学机械工程与应用电子技术学院,北京100022

出　　处：《机械工程学报》2009年第3期302-306,共5页Journal of Mechanical Engineering

基　　金：北京市自然科学基金资助项目(3032004)

摘　　要：针对短路过渡CO2气体保护焊在焊丝伸出长度变化较大时,焊接电弧稳定性差,易导致焊接过程中断和焊缝成形不良的问题,采用一种以ADI公司的ADSP2181数字信号处理器为核心,设计具有全数字控制特点的CO2焊短路过渡模糊控制系统。模糊控制系统由模糊控制器和波形控制参数在线调整两部分组成,模糊控制器主要是调节送丝速度,而后以送丝速度为依据,通过波形控制参数在线调整包括焊接电源输出电压在内的短路过渡波形控制参数。试验证明,模糊控制系统通过在线焊接平均电流检测与计算,自动调整送丝速度和波形控制参数,增强了焊接过程中焊丝伸出长度变化时焊接电弧的稳定性,提高了短路过渡CO2焊丝伸出长度的适应范围,焊丝伸出长度的变化在8～45mm的范围内均可获得良好的焊缝成形。A fully digital wire extension fuzzy control system for CO2 short-circuit welding is presented. The main component is a digital signal processor ASDP2181 of ADI company, and the digital fuzzy control system also is designed and embedded in digital signal processor. It includes the fuzzy controller module which is designed to modulate wire speed and the waveform parameters modulation module which is used to modulate waveform parameters for short circuit CO2 welding and output voltage of welding machine. The welding process experiment proves that this system can keep arc stability and weld appearance in spite of the change of wire extension by measuring and calculating the average welding current online and automatically adjusting wire speed and waveform control parameters. The change of wire extension can be compensated in 8 -45 mm.

关 键 词：数字信号处理器 模糊控制 短路过渡CO2焊 数字控制系统 

分 类 号：TG444[金属学及工艺—焊接]