热冲压高强钢伺服点焊工艺  

Process of spot welding using servo welding gun for HSHSS

作　　者：陈树君[1] 王超[1] 于洋[1] 白韶军[1] 卢振洋[1] 白立来[1] 

机构地区：[1]北京工业大学汽车结构部件先进制造技术教育部工程中心,北京100124

出　　处：《焊接技术》2012年第3期19-22,1,共4页Welding Technology

基　　金：科技重大专项基金资助项目(2009ZX04014-072-03)

摘　　要：热冲压高强钢点焊过程易产生飞溅、缩孔,并且存在热影响区软化等现象。通过对热冲压高强钢点焊工艺初步分析表明,热冲压高强钢点焊需采用较大电极压力。采用恒流模式,当电极压力为4.2 kN时进行点焊,点焊过程易产生飞溅,导致焊接窗口较小,并且熔核中存在缩孔缺陷。采用合理的点焊锻压力可以显著抑制缩孔产生。智能调控(IQR)点焊模式根据动态电阻的变化,自适应调节热量输入,可大大降低飞溅率,且保证点焊质量的稳定性。The weldability of Hot Stamping High Strength Steel(HSHSS) was briefly investigated.The results showed that high pressure would be needed for the spot welding of HSHSS.The splashing tendency was high at 4 200 N welding pressure in the constant current welding mode,which causes a small welding window.With the same welding parameters,the shrinkage was easily formed in the nugget.Proper forgery pressure could prevent obviously the shrinkage.According to the dynamic resistance,Intelligent Quality Regulation(IQR) welding mode could regulate adaptively welding heat input,which could reduce splash rate and ensure the stability of the welding quality.

关 键 词：热冲压高强钢 点焊 伺服 飞溅 缩孔 

分 类 号：TG453[金属学及工艺—焊接]