一种应用于薄板搭接的磁控电弧焊缝跟踪方法

A seam tracking method for overlap sheet welding based on magnetic-control arc sensing

薄板搭接的焊缝自动跟踪一直以来都是焊接领域的一个难点,针对其特点提出了一种应用于薄板搭接的磁控电弧焊缝跟踪方法,该方法是采用外加横向交变磁场来控制焊接电弧左右摆动扫描搭接坡口并通过检测焊接电流的变化规律来检测焊缝的偏差信号.分别采用双级二阶巴特沃思硬件滤波和小波滤波软件处理,并进行相关对比,最终选定小波阈值降噪滤波处理方法.针对薄板搭接特点和磁控电弧摆动规律,提出了一种基于中点均分面积积分单边比较法和焊枪控制法相结合的焊缝偏差控制方法.通过实际的焊缝跟踪试验表明,这种磁控电弧焊缝自动跟踪方法在薄板搭接上具有独特的优势.

The automatic seam tracking of overlap seams of sheet was always a particular problem in the welding field.According to the characteristics of its welding procedure,a seam tracking method for overlap sheet welding based on magneticcontrol arc sensing is proposed in this paper. By employing external alternating transverse magnetic field to control arc motion,this method acquires the real-time welding deviation through detecting the variation rules of welding currents. Wavelet threshold de-noising method is selected to process the current signals after contrastive analysis on the filtering results of the two-level second-order Butterworth filter and the wavelet filtering. Based on the analysis of characteristics of overlap sheet welding and the motion of magnetic-control arc,a control method of welding deviation correction based on the combination of unilateral-compared midpoint-divided area integral method and the torch-control method is proposed. The results of practical seam tracking experiments demonstrate that the automatic seam tracking method proposed can effectively resolve the dilemma of real-time seam tracking during overlap sheet welding.