旋转电弧MAG焊强迫短路过渡电流信号滤波

Welding currents filtering of compulsively short circuiting transfer in rotational arc MAG welding

关键词:  旋转电弧  短路过渡  焊接电流  小波滤波

Key words:  rotational arc welding  short circuiting transfer  welding currents  wavelet filtering

摘要:

研究了MAG焊旋转电弧V形坡口扫描焊接电流的变化特征,发现当电弧扫描到坡口两侧时,由于电极高度变小,会产生强迫短路熔滴过渡.在短路过渡的瞬间会产生较大的峰值电流,对旋转电弧传感器的检测灵敏度造成影响.为此提出了基于空间邻域的均值滤波和软阈值小波滤波组合算法,对实际焊接电流信号进行了滤波处理,并研究了该算法的实时性.结果表明,该算法可以使电流波形得到明显的改善,并具有较强的实时性,为焊枪偏差识别奠定了基础.

Abstract:

The present paper describes the welding current characteristics of rotational arc MAG welding in V groove.It is found that the compulsively short circuiting transfer would take place when the welding gun rotates to the sides of V groove.The reason for this phenomenon is that the contact tip distance between the wire tip and workpiece becomes short when the welding gun moves to the sides of groove.During the period of short circuiting transfer,the welding currents would sharply increase,so as to affect the rotational arc sensor sensitivity.A hybrid filtering method based on spatial neighborhood mean filter and soft threshold wavelet filter is proposed to process the welding currents,and the real-time characteristics of this method is researched in this paper as well.The experimental results show that the hybrid filtering method has a higher filtering property and better real-time character.This study will set up the foundation for the welding gun deviation identification in the welding seam tracking.