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针对车用5052铝合金举办了高功率光纤激光搭接深熔焊试验研究,阐明白光纤激光焊接的主要影响因素,并对讨论组织和力学机能举办了测试。通过对车用铝合金光纤激光焊接特性的阐明得出,传输光路的光纤芯径、板间间隙的巨细、掩护气体的种类和掩护方法等对搭接讨论描摹有着重要的影响。回收高功率光纤激光焊接时,速度快,熔池及热影响区(HAZ)窄。在适宜的焊接工艺参数下,光纤激光焊接讨论上、下外貌焊缝描摹平整持续;焊缝区显微硬度高于母材;讨论抗拉伸强度高于抗拉剪强度,断口呈此刻搭接焊缝一侧的热影响区内,断口以韧窝描摹为主,属于以韧性断裂为主、脆性断裂为辅的殽杂断裂。

要害词

Abstract

Experimental study on high power fiber laser deep-penetration welding of automobile 5052 aluminum alloy in an overlap configuration is carried out,and the main influencing factors on fiber laser welding are analyzed,and the micro-structure and the mechanical properties of the welded joints are measured. Through analyzing fiber laser welding performance of automobile aluminum alloy,the influencing factors such as fiber core diameter,gap thickness between two plates,kinds of shielding gas,and the protection way on the morphology and properties of overlap-welded joint are prominent. High welding speed and narrow weld pool and heat affected zone (HAZ) can be obtained when welding by fiber laser. Under the proper welding condition,the weld topography of top surface and bottom surface is even and continuous. Micro-hardness in fusion zone is higher than that of base material. The tensile-strength of welding joints is higher than its shear strength. The fracture is happened in HAZ and its topography is a mixture of ductile fracture as main mode and brittle fracture as subsidiary mode.

增补资料

中图分类号：TG456.7

DOI：10.3788/cjl20103708.2091

所属栏目：激光制造

基金项目：国度863打算(2007AA042006)、教诲部长江学者与创新团队成长打算(531105050037)和汽车车身选进设计制造国度重点尝试室自主研究课题(6087005)扶助课题。

收稿日期：2009-12-23

修改稿日期：2010-01-25

网络出书日期：0001-01-01

作者单元    点击查察

梅丽芳：湖南大学 汽车车身先进设计制造国度重点尝试室,湖南 长沙 410082厦门理工学院 机器工程系,福建 厦门 361024
陈根余：湖南大学 汽车车身先进设计制造国度重点尝试室,湖南 长沙 410082
金湘中：湖南大学 汽车车身先进设计制造国度重点尝试室,湖南 长沙 410082
张明军：湖南大学 汽车车身先进设计制造国度重点尝试室,湖南 长沙 410082
陈明：湖南大学 汽车车身先进设计制造国度重点尝试室,湖南 长沙 410082

接洽人作者：梅丽芳(meilifang0804@163.com)

备注：梅丽芳|主要从事白车身激光加工技能方面的研究|(1982-),女,博士研究生。

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