摘要
汽车用先进高强钢MS1400以其低合金成分和超高的抗拉强度等优势,在汽车的生产制造领域具有很大的潜力,但由于其电阻点焊的焊接接头具有焊核小,易产生缩孔和裂纹,易飞溅,易界面剥离以及明显的软化区等局限性,限制了其在汽车制造方面的广泛应用。本文针对这一问题,通过调节电阻点焊工艺参数来进行试验,得到焊核内部无明显缩孔和裂纹的焊接接头,实现了钮扣拔出的断裂模式,获得了MS1400的较优的点焊工艺参数,并对焊点的金相组织、显微硬度和断口形貌进行了分析。
Because of advanced high strength steel MS 1400 for automobile with its low alloy composition and ultra-high tensile strength and other advantages, it has great potential in the field of automobile manufacturing, but because its resistance spot welding joints have small nugget, tend to produce shrink holes and cracks, splash, interface delamination and significant softening areas such limitations, its wide application in automobile manufacturing is limited. Aiming at this problem, by adjusting the resistance spot welding process parameters to be tested, welded joints with no shrink holes or cracks inside the nugget were gotten, a fracture mode of button pulled out was achieved, and MS1400＇s optimum spot welding process parameters were obtained. Meanwhile, microstructure, microhardness and fracture morphology of the joints were analyzed.
作者
吴昌平
贺地求
赖瑞林
姚俊歌
王培中
WU Changping HE Diqiu LAI Ruilin YAO Junge WANG Peizhong(Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Centers, Central South University, Changsha 410083, China State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China GM R＆D Center, Warren M148090, USA)
出处
《热加工工艺》
CSCD
北大核心
2016年第19期46-49,61,共5页
Hot Working Technology
关键词
先进高强钢
电阻点焊
工艺性能
advanced high strength steel
resistance spot welding
process performance
