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提出了一种全新的脉冲熔化极气体保护焊(GMAW)方法,并研制出新型超音频复合脉冲GMAW电源,即在传统脉冲GMAW电流基础上复合叠加频率为20~80 k Hz、电流幅值为0~100 A、占空比为0%~100%的连续可调的超音频脉冲电流。设计了并联结构的主电路拓扑及MCU+DSP双处理器数字化控制系统,通过软件编程实现了电流给定信号与PWM信号的同步输出及不同逻辑组合,可实现不同工作模式的焊接电流波形输出。对电源输出电流波形的测试结果表明:本文所设计的超音频复合脉冲GMAW电源输出电流波形满足不同工作模式的设计目标,超音频脉冲电流频率在80 k Hz时,仍保持较快的电流上升沿与下降沿变化速率。初步进行了铝合金平板堆焊试验,焊缝成形良好。
A new pulse GMAW method is proposed and a new type of super-giga-pulse GMAW power supply is developed. The GMAW pulse current is 20-80 k Hz and the current amplitude is 0 ~ 100 A, duty cycle of 0% to 100% of continuously adjustable super audio pulse current. The main circuit topology and MCU + DSP dual-processor digital control system with parallel structure are designed. The synchronous output of current reference signal and PWM signal and different logic combinations are realized by software programming, and the welding current waveform output can be realized in different working modes. The test results of the power supply output current waveform show that the output current waveform of the GMAW power supply in this article meets the design goals of different operating modes. The super-pulsed current frequency still maintains a fast current rising edge at 80 k Hz With falling edge rate of change. The initial aluminum flat surfacing test, the weld is well formed.