激光功率对304不锈钢薄板搭接接头组织和性能的影响  

Influence of Laser Power on Microstructure and Properties of Lap Joints of 304 Stainless Steel Sheet

作　　者：郭国林[1,2] 杨莉[1] 柳健 戴军[1] 张尧成[1] 于学勇[1] 

机构地区：[1]常熟理工学院机械工程学院,江苏常熟215500 [2]江苏省机电产品循环利用技术重点实验室,江苏常熟215500

出　　处：《热加工工艺》2016年第9期213-215,共3页Hot Working Technology

基　　金：苏州市科技计划项目(SGZ2013125);江苏省机电产品循环利用技术重点实验室开放基金资助项目(KY301201402-2)

摘　　要：研究了在1.2 mm/s焊接速度下,激光功率对304不锈钢薄板搭接接头组织和性能的影响。结果表明,焊缝区熔合线附近组织为树枝晶组织,焊缝中心为等轴晶,随着激光功率的提高,枝晶变长,枝晶间距变大,等轴晶区域减小,晶粒粗化。焊缝区的显微硬度随激光功率的提高而增大,高于母材硬度。不同激光功率条件下制备的接头强度不同,激光功率为5 kW时,接头的抗拉强度最优,略高于母材的强度。The influence of laser power on the microstructure and properties of lap joints of 304 stainless steel sheet was investigated, when laser scanning velocity is 1.2 mm/s. Th results show that the structure near fusion line in the welding zone is dendrites and the structure of welding center is isometric. The dendritic structure and spacing become more bulky and isometric area is smaller and the grain is more coarsening with the increase of laser power. The microhardness of the welding seam rises, which is higher than that of base metal, when the laser power increases. The strength of welded joint prepared by different laser poweris is different. The tensile strength of the welded joint is optimal, which is slightly higer than that of base metal, when laser power is 5 kW.

关 键 词：激光功率 304不锈钢薄板 显微硬度 抗拉强度 

分 类 号：TG456.7[金属学及工艺—焊接]