短路过渡弧焊过程稳定性在线评价模型设计

采用短路过渡弧焊电流、电压波形为信号源，选择单次熔滴过渡周期为基本单元，提取表征熔滴过渡状态的特征参数，以飞溅率作为稳定性的实测指标．在此基础上，分析了熔滴连续过渡的焊接过程，并采用变异系数方法表征特征参数在整个焊接过程的波动程度．采用统计分析和偏最小二乘回归方法提出了过程稳定性在线评价模型，克服了输入变量严重多重相关性的问题．实验证明，该模型的准确性满足在线评价的要求，检测结果达到预计效果．

An On-line Evaluation Model for Process Stability of Short-Circuit Arc Welding

The current and voltage waveforms were analyzed to extract the characteristic parameters from one transfer period, while their variation coefficients reflect the fluctuation of welding process. Based on this, an on-line evaluation model of process stability with statistical method and partial-least-square regression (PLSR) was set up which overcome the multicollinearity of input parameters. The experimental result shows that the model can meet the requirement of veracity.