马氏体不锈钢与铝青铜封严环真空钎焊工艺  

Vacuum Brazing Technology of Seal Ring Composed of Martensitic Stainless Steel and Aluminum Bronze

作　　者：石素霞 左谋 刘雪丽 杨春蓉 SHI Suxia;ZUO Mou;LIU Xueli;YANG Chunrong(AECC Aero Science and Technology Co.,Ltd.,Chengdu 610503,China)

机构地区：[1]中国航发航空科技股份有限公司,四川成都610503

出　　处：《电焊机》2022年第1期103-108,共6页Electric Welding Machine

摘　　要：某航空发动机封严环结构由1Cr17Ni2材质的安装边和QAl7材质的环通过真空钎焊连接在一起,按原工艺加工合格的零件装配发动机试车后,大部分零件在试车过程中出现铜环脱焊现象,严重制约了研制进度。采用模拟件改进封严环的真空钎焊工艺,选用HBAg72CuNiLi共晶钎料,在室温下将预留钎焊间隙调整为0.18~0.20 mm,通过安装边内圆、车削加工铜环外径来保证钎焊间隙,增加钎焊工装以防止钎焊过程中焊缝开裂。结果表明,获得的钎缝表面均匀、过渡圆滑、未见缺陷,符合质量要求。焊后采用水浸超声波检测代替X射线探伤检测焊缝,检测结果与金相检测结果一致。采用新工艺钎焊的零件通过了试车考核,解决了该零件钎焊焊缝开裂的难题。The sealing ring structure of an aero engine is connected by the mounting edge of material 1Cr17Ni2 and the ring of material QAL7 through vacuum brazing.After the aero engine test run,the qualified brazing seam processed by the original process appeared the phenomenon of brazing crack,which seriously restricted the development progress.In this paper,vacuum brazing technology of sealing ring is improved by using simulated parts,and HBAg72CuNiLi eutectic filler metal is used.The brazing gap is adjusted to 0.18~0.20 mm at room temperature,the brazing gap is ensured by turning the external diameter of bronze ring according to the size of the mounting edge,and the weld cracking during brazing is prevented from increasing the brazing equipment.The results show that the brazing seam has uniform surface,smooth transition and no defects,which meets the quality requirements.The water immersion ultrasonic testing is used instead of X-ray inspection to detect the brazing seam,and the detection results are consistent with the metallographic detection results.The parts brazed by the new technology pass the test run and the problem of cracking of brazing seam is solved.

关 键 词：封严环 真空钎焊 钎焊间隙 水浸超声波检测 

分 类 号：TG454[金属学及工艺—焊接]