送丝速度对镀锌钢激光钎焊接头性能影响研究  

Study of Influence of Wire Feeding Speed on Properties of Laser Brazing Joint of Zinc-Coated Steel

作　　者：马凯[1,2] 于治水[1,2] 张培磊[1,2] 卢云龙[1,2] 褚振涛[1,2] 史海川[1,2] 

机构地区：[1]上海工程技术大学材料工程学院,上海201620 [2]高强激光智能加工装备关键技术产学研开发中心,上海201620

出　　处：《中国激光》2014年第10期56-60,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(51375294);上海市自然科学基金(12ZR1444500);上海市科委地方高校能力建设项目(13160501200);上海市教委创新项目(14YZ139,12ZZ186);上海工程技术大学高水平培育项目(2012gp21);上海工程技术大学研究生创新项目(13KY0510,13KY0509)

摘　　要：激光钎焊过程中有很多影响焊接接头质量的因素,如激光功率,焊接速度,离焦量等,主要研究了送丝速度对焊接接头力学性能的影响。实验结果显示:焊接接头中有Fe-Si(Cu)弥散相的析出,这些析出相呈现颗粒状,小岛状或者花瓣状分布。当送丝速度达到2.0m/min时,弥散相的分布最为密集,焊接接头的力学性能最好,并高于母材,在母材处发生断裂;当送丝速度为1.7m/min和2.3m/min时,Fe-Si(Cu)相只是零星的分布在焊接接头内,接头力学性能比母材差,拉伸实验断裂在焊缝处,断裂方式属于韧性-塑性型。Many factors affect the quality of the overlap joint in the laser brazing process,such as laser power,welding speed,defocusing distance and so on.The influences of wire feeding speed on the overlap joints′mechanical properties are studied.The results indicate that a large number of dispersed phases are found in the overlap joint,which is identified as Fe-Si（Cu）.These phases appear as granular,island or petal shape.A joint with best mechanical property is got when the wire feeding speed is 2.0m/min.Phases of Fe-Si（Cu）distribute densely in the joint.The mechanical properties of the overlap joint is best,and is higher than that of the base metal.The fracture occurs in the base metal.When the wire feeding speed is 1.7 m/min and 2.3 m/min,phases of Fe-Si（Cu）only sporadics distribute in the joint.The mechanical properties of the overlap joint is worse than that of the base metal.The fractare occurs at the brazing seam.The fracture mode is the ductile and brittle mixed fracture.

关 键 词：激光技术 镀锌钢板 送丝速度 弥散相 断裂 

分 类 号：TG454[金属学及工艺—焊接]