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对铝制油冷器进行真空钎焊实验,采用金相分析方法研究了钎焊接头的熔蚀行为,并进行了理论分析。结果表明:在设定钎焊温度630℃,实际钎焊温度627℃,保温时间4min时,铝制油冷器翅片与隔板T型接头圆角处发生严重的熔蚀行为,其实质是钎料和母材之间发生过分的相互作用,母材大量溶解进钎料中,被溶解的母材的位置被液态钎料冷却重凝出来的α-Al组织占据,温度越高,钎料体积越大,保温时间越长,越易发生熔蚀。
The vacuum brazing experiments of aluminum oil cooler were carried out. The corrosion behavior of brazed joints was studied by metallographic analysis and the theoretical analysis was carried out. The results show that the serious corrosion behavior occurs at the fillet of the T-joint of the aluminum oil cooler fins and the separator when the brazing temperature is 630 ℃, the actual brazing temperature is 627 ℃ and the holding time is 4min. Excessive interaction occurs between the filler metal and the base metal, a large amount of base metal is dissolved in the filler metal, the position of the base metal to be dissolved is occupied by the α-Al structure that is cooled and solidified by the liquid solder, and the higher the temperature, The larger the volume, the longer the holding time, the more prone to erosion.