基于结构负载声发射信号检测的镀锌钢板电阻点焊飞溅主控因素分析

Analysis on main factors of resistance spot welding spatter of galvanized sheet based on structure-bearing acoustic emission signals

利用实时监测结构负载声发射信号实现了镀锌钢板电阻点焊过程中的飞溅现象的检测.以焊接飞溅声发射事件的正峰值和振铃计数为考核指标,通过正交试验设计法设计焊接试验和方差分析法进行显著性检验,研究了镀锌钢板电阻点焊飞溅的主控因素.结果表明,焊接飞溅释放出的能量当量可由其声发射事件的正峰值和振铃计数两个特征参数定量评估.影响焊接飞溅的主要因素为焊接电流和电极力,而焊接电流所起的作用比电极力更为重要.焊接时间和焊接电流与电极力的交互作用对焊接飞溅的影响相差不大.焊接电流和焊接时间越大,焊接飞溅当量越大;电极力越大,焊接飞溅当量越小.

According to the acoustic emission( AE) signals detected in resistance spot welding( RSW) on galvanized steel sheet,the main inducing factors of welding spatter were analyzed by orthogonal experimental design( OED) and the analysis of variance( ANOVA). The results showed that the equivalent released energy by welding spatter can be assessed by two characteristic parameters: positive peak value and AE count.The most important factor inducing welding spatter is welding current,the second factor is pressure. The importance of welding duration and interaction of welding current and electrode pressure is close. The welding current and welding duration have a positive effect on the equivalent weight of spatter. While the electrode pressure has a negative effect on the equivalent weight of welding spatter.