作　　者： ; ; ; ;

机构地区： 华南理工大学机械与汽车工程学院

出　　处： 《电焊机》 2009年第9期48-53,共6页

摘　　要： 设计了基于DSP的数字化双脉冲MIG焊电源,在此基础上研究铝合金材料焊接工艺。优化了起弧方式,不仅提高了起弧成功率,且起弧点熔深效果比普通起弧好。研究了强、弱脉冲电流的匹配与焊缝成形的关系,结果表明,强、弱脉冲峰值电流相差40A,高频频率250Hz时焊缝成形较好。通过试验证明了在输出端采用RC滤波电路,可以滤除电压中的高频干扰,达到降低弧压的目的。研究了恒流PI控制的参数整定方法和步骤,试验结果表明,当比例系数Kp与积分时间ti的值满足5:1的关系时,焊接过程稳定,可以获得良好的焊接效果。 Digital double pulse MIG welding power source is established with a central controller of DSP,based on witch the process of aluminum-alloy welding is researched.Arc striking is optimized, so the successful rate is increased and the weld penetration effect is improved as well.Relation between the processing parameters and weld forming is researched.Tests show that weld forming is good when the value of strong and weak pulse peak current is 40 A and high frequency is 250 Hz.RC filter is adopted in output terminal,so that high-frequency interferences is eliminated and arc voltage is reduced.Tuning method and steps of PI control parameters are also researched.The results show that stable welding process and high-quality welding seams could be achieved when proportional coefficient Kp and integration time ti match the ratio of 5：1.

关 键 词： 双脉冲焊 工艺过程优化 滤波 控制

领　　域： [金属学及工艺]