基于近似熵铝合金脉冲MIG焊过程稳定性分析

Analysis on welding stability of aluminum alloy pulse MIG welding based on approximate entropy

为确定铝合金脉冲MIG(P-MIG)焊过程稳定性,根据近似熵的理论,对铝合金脉冲MIG焊中的电压信号进行近似熵分析,通过对不同焊接速度、送丝速度与占空比的焊接工艺参数下的电压信号近似熵的计算与比较.结果表明,利用电弧电压信号的近似熵分析可以衡量铝合金脉冲MIG焊接过程稳定性,平均近似熵值小,标准方差小,其焊接过程比较稳定;平均近似熵值大,标准方差大,其焊接过程不稳定.

In order to evaluate the stability of aluminum alloy pulsed MIG welding,an approximate analysis has been done on voltage signal in the process of aluminum alloy pulsed MIG welding.The calculation and comparison of the approximate entropy on voltage signal under different welding procedures such as welding speeds,wire feed rate,duty cycle and so on,show that,the approximate entropy of voltage can reflect the stability of the process of aluminum alloy pulsed MIG welding.The results show that,the smaller the average value of approximate entropy and standard deviation is,the more stable the welding process will be.On the contrary,the welding process is unstable while the average value is high.