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钎料的化学成分、性能和经济性化学成分(%)锡54.94、锌38.41、铝2.62、银2.22。钎料的金相组织属于共晶型钎料。机械性能抗拉强度为10.55公斤/毫米~2;延伸率为12.5%。经济性比较铝—铜钎料每公斤价格为7.32元,焊锡每公斤7元。钎焊工艺焊前准备铜线用硝酸除去氧化膜,用铬酸水溶液处理,用清水冲洗,晾干。铝线放于40～50℃的 NaOH(10%)水溶液中进行清洗,清洗时间为10～20秒,然后用温水冲洗,晾干即可。电机中常用的是氧化膜铝线和聚脂漆包铝线,对于氧化膜铝线可用上述方法清理;对于聚脂漆包铝线,建议用刮刀清理。钎焊过程钎焊所用热源是氧—乙炔焰,钎焊温度是320～350℃,钎焊间隙要适宜,过程如下:
Chemical composition, performance and economy of solder Chemical composition (%) Tin 54.94, Zinc 38.41, Aluminum 2.62, Silver 2.22. The microstructure of the brazing filler metal belongs to the eutectic type brazing filler metal. Mechanical properties of the tensile strength of 10.55 kg / mm ~ 2; elongation of 12.5%. Economic comparison aluminum - copper solder per kilogram price of 7.32 yuan, 7 yuan per kilogram of solder. Preparation of brazing welding Preparation of copper oxide film with nitric acid, chromic acid solution, rinse with water and dry. The aluminum wire is cleaned in an aqueous solution of NaOH (10%) at 40 to 50 ° C for 10 to 20 seconds, then rinsed with warm water and allowed to air dry. Commonly used in the motor is the oxide film aluminum wire and polyester enameled aluminum wire, aluminum oxide film can be used for cleaning above methods; for polyester enameled aluminum wire, it is recommended to use a scraper to clean. Brazing brazing process is the source of oxygen - acetylene flame, brazing temperature is 320 ~ 350 ℃, brazing gap to be appropriate, the process is as follows: