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车身异种材料光纤激光搭接焊研究

发表时间:2011-02-28  浏览量:1676  下载量:756
全部作者: 梅丽芳,陈根余,易际明,刘金武,李时春
作者单位: 厦门理工学院机械工程系;湖南大学汽车车身先进设计制造国家重点实验室
摘 要: 主要针对车身高强镀锌钢、镀锌钢、普通低碳钢等异种材料进行光纤激光搭接焊试验。分析异种材料高功率光纤激光器搭接焊关键技术、焊缝成形形貌和性能,以控制和优化车身光纤激光焊接工艺质量。试验结果表明:焊接双面镀锌板时,板间贴合处的缝隙大小对焊缝形貌的影响很大。在相同参数下焊接异种板材搭接接头,当具有镀锌层的钢板为上板时,焊缝熔宽较窄。在本试验条件下,采用CO2激光焊接的接头截面呈“高脚酒杯”状,而采用光纤激光焊接的接头截面近似于“大拇指”形状,且光纤激光焊接的搭接接头板间连接宽度较大,接头失效前能承受的拉剪载荷值更高。搭接接头的抗拉伸强度比抗拉剪强度大,其抗拉剪载荷的能力主要由两板间的熔接宽度决定。
关 键 词: 车辆工程;车身加工;光纤激光器;搭接焊;截面形貌;力学性能
Title: Study on fiber laser overlap-welding of automobile dissimilar steels
Author: MEI Lifang, CHEN Genyu, YI Jiming, LIU Jinwu, LI Shichun
Organization: Department of Mechanical Engineering, Xiamen University of Technology; The State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University
Abstract: The high-power fiber laser welding experiments on automotive dissimilar materials such as high-strength galvanized steels, galvanized steels and common cold rolled automotive plates were carried out. The key technologies, the transverse weld topography and the performance of high-power fiber laser lap-welding dissimilar materials were analyzed, so as to control and optimize the craft quality of fiber laser welding automobile body. The test result indicated that the influence of plates space on weld topography was significant when laser welding dual-galvanized plates. On the condition of laser welding lap joint composed of dissimilar materials under the same parameters, the weld width was relatively narrow when the galvanized steel for boarding up. Under this test condition, the cross section of weld joints was similar as “high foot wine glass” when they were welded by CO2 laser, but when lap joints were welded by high power fiber laser, the cross section of joints was similar as “thumb” and the connection width between plates was a bit greater and the joints anti-shearing force was stronger. The anti-tensile ability of lap joint was greater than its anti-shearing ability, and its anti-shearing ability was mainly decided by fusion width between two plates.
Key words: vehicle engineering; automobile process; fiber laser; overlap welding; cross-section topography; mechanical property
发表期数: 2011年2月第4期
引用格式: 梅丽芳,陈根余,易际明,等. 车身异种材料光纤激光搭接焊研究[J]. 中国科技论文在线精品论文,2011,4(4):342-348.
 
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