铝合金电阻点焊质量特征的提取与分析  

Acquisition and analysis of resistance spot welding quality characteristics

作　　者：冀春涛[1] 罗贤星[1] 邓黎鹏[1] 

机构地区：[1]南昌航空大学材料科学与工程学院,南昌330034

出　　处：《焊接学报》2009年第6期43-46,共4页Transactions of The China Welding Institution

基　　金：江西省教育厅科学技术项目(GJJ09201)

摘　　要：为了建立在线电阻点焊质量检测系统,研究了用中频逆变直流点焊机焊接铝合金5182时动态电极位移和压力的特征,讨论了相关质量特征的焊接过程监控策略.结果表明,在焊接开始阶段,电极位移和压力均迅速上升,其后上升速率减缓.电极位移和压力的上升速率均正比于焊接电流,且当喷溅发生时,二者均有一个突降过程.在焊接过程中,即使熔核达到足够大的尺寸,电极位移上升速率也不会下降至零.当产生较大的焊点熔核时,电极压力曲线会出现一个峰值.In order to develop online resistance spot welding quality monitoring system,the dynamic characteristics of electrode force and displacement were studied during resistance spot welding of aluminum alloy 5182 using a medium frequency direct current welder,and strategies for process monitoring and control based on the characteristics were discussed.The results show that both displacement and force of electrode increase rapidly at the beginning of the welding stage and then at a reducing rate.Rates of increase in displacement and force of electrode are proportional to welding current.Both displacement and force of electrode experience a sudden drop when weld metal expulsions occur.The rate of increase in electrode displacement is not reach zero during welding even for joints with sufficient nugget diameter,but electrode force peaks when a large nugget appears.

关 键 词：电阻焊 数据采集 电极位移 电极压力 焊接质量监控 

分 类 号：TG453[金属学及工艺—焊接]