空间发动机激光深熔焊气孔特性研究  

A study on porosity characteristics of laser deep penetration welding in space engines

作　　者：宋凡 马纪龙 于康 周杰 Song Fan;Ma Jilong;Yu Kang;Zhou Jie(Shanghai Institute of Space Propulsion,Shanghai 201112,China)

机构地区：[1]上海空间推进研究所,上海201112

出　　处：《焊接》2018年第8期44-49,67,68,共8页Welding & Joining

摘　　要：对空间发动机模拟件进行了激光焊工艺试验和理论分析,相关结果表明:在达到某个特定熔深的前提下,气孔率随着激光功率的升高、焊接速度的降低、离焦量的负向增大、入射角的正向变动、保护气的侧向大流量吹送而升高。在探明气孔特性的基础上得到了最有利于抑制激光深熔焊气孔的工艺规范,采用该规范焊接了一批较高熔深的发动机产品试样,相关测试表明焊缝的气孔率和其他性能满足相关标准的I级要求,并且最终应用该技术的正式产品已通过了飞行试验考核。The process test and theoretical analysis were conducted on laser welding in space engine simulation parts.Results show that,under the premise of reaching a certain weld depth,the porosity increases with the increase of the laser power,the decrease of the welding speed,the negative increase of the defocus amount,the positive change of the incident angle,and the lateral large flow of the shielding gas.On the basis of the proven stomata characteristics,the process specification was obtained,whih is the most conducive to suppress the deep penetration of laser deep-welding.By using this specification,a number of samples of engine products were welded.Relevant tests have shown that the porosity and other properties of the weld meet the Class I requirements of the industry standard,and official products have passed the flight test.

关 键 词：激光深熔焊 气孔率 匙孔 熔池形态 工艺参数 

分 类 号：TG456.7[金属学及工艺—焊接]