Mathematical model of rotating arc sensor based on actual deposited metal of the weld pool
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摘要: 旋转电弧传感器数学模型是提高焊接质量、旋转电弧信号处理和焊缝偏差提取的理论基础, 焊接熔敷金属堆积形状是决定旋转电弧长度主要因素之一，影响其数学模型精确度. 采用双线结构光传感系统对焊接收弧阶段焊缝进行三维重建获得焊接熔池熔敷形状，运用单纯形法最优化电弧长度，在此基础上建立了旋转电弧传感器数学模型及仿真模型. 结果表明，该数学模型相对于假设的三角锥熔敷形状数学模型，消除了焊接过程工件变形引起的电流信号误差，减小了焊缝转角和焊缝偏差检测误差，提高了旋转电弧传感器数学模型精度.Abstract: Mathematical model of rotating arc welding system is the theoretical basis of obtaining better welding quality, rotating arc signal processing and welding seam deviation extraction. The shape of weld pool has a great effect on the length of welding arc, thus affecting the accuracy of the mathematical model. Using double line structured-light vision sensor scanned the weld shape of weld ending stage and then reconstructed three-dimensional deposited metal shape of weld pool shape, selecting the simplex method to solve the length of welding arc. On this basis, the mathematical model of the rotating arc welding system and simulation model is established. The results showed that compared with the mathematical model based on triangular cone weld pool shape, the one based on the shape of the actual deposited metal of weld pool can effectively eliminate the current signal error caused by the deformation of the work piece during the welding process and decrease the error of weld rotation and weld seam deviation identification, thus the mathematical model of rotating arc welding is improved.
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