汽车节能减排与热冲压硼钢点焊技术  

Energy conservation and emission reduction for automobile & spot welding technology of hot stamping boron steel

作　　者：陈树君[1] 王旭平[1] 白立来[1] 于洋[1] 郝素锋[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》2013年第12期33-36,9,共4页Welding Technology

基　　金：国家科技重大专项项目(2009ZX04014-072);北京工业大学博士科研启动基金

摘　　要：热冲压硼钢技术已经成为汽车轻量化的重要技术之一,国内对于热冲压成形技术,特别是对于热冲压硼钢的点焊技术研究仍处于开始阶段。本文简要介绍了热冲压钢板技术及其国内外研究情况,重点研究焊接电流对点焊接头力学性能及显微组织的影响规律。试验结果表明:当点焊电极压力为6 000 N,焊接电流由6 kA增大至9.5 kA时,焊核直径及点焊接头剪切载荷随焊接电流的增大而增大;接头延性比先增大而后减小;热冲压硼钢点焊接头热影响区存在软化区,此软化区宽度随焊接电流的增大而增大;点焊接头的剪切断裂模式由界面断裂变为部分焊核拔出,之后再发展为完全焊核拔出,这种转变由软化区宽度变化情况决定。The study on hot stamping technology which is one of the import technology for vehicle mass reduction is still very much in its infancy in China. This paper gave a brief introduction of hot stamping technology and its current research status. The effect of current of resistance spot welding on the mechanical properties and microstructure were studied. The experiments results showed that the welding nugget diameter and shear load carrying capacity increase with the current increasing from 6 kA to 9.5 kA at 6 kN electrode pressure. But the ductility ratio first increased, then decreased. There is a soften region exist in the heat affected zone(HAZ) of the welding joints. The width of the soften region increases with the increasing of current. With the increasing of current, the fracture mode changes from the interfacial fracture to nugget pull-out, which is determined by the soften condition of HAZ.

关 键 词：热冲压硼钢 点焊 汽车 

分 类 号：TG457.11[金属学及工艺—焊接]