LD30铝合金与304不锈钢低温钎焊润湿性研究

采用LD30铝合金与304不锈钢低温钎焊工艺进行润湿性研究。通过润湿性研究对比,选用了60Sn-40Pb、Sn-3.5Ag和35Sn-40Pb-25Bi3种 适用于LD30铝合金和304不锈钢的低熔点钎料,并针对每种钎料选取与之相匹配的钎剂。分析了接头的微观组织、化合物相成分和X射线探伤。结果表明:60Sn-40Pb 和35Sn-40Pb-25Bi与H₃PO₄组合在304不锈钢上润湿性很好;不锈钢与镀镍层铝合金钎焊试验时,60Sn-40Pb和35Sn-40Pb-25Bi与50% H₃PO₄+50%乙二醇组合润湿性很好;Sn-3.5Ag 钎料润湿性相对较差。

Low-temperature brazing wettability research of LD30 aluminum alloy and 304 stainless steel

LD30 aluminum alloy with 304 stainless steel using low temperature brazing was performed in the wettability research. Through wettability study contrast, three kinds of low melting point solders 60Sn-40Pb, Sn-3.5Ag and 35Sn-40Pb-25Bi which were suitable for LD30 aluminum alloy and 304 stainless steel were chosen, and solder flux was selected. The joint of microstructure, phase composition, X-ray inspection were analyzed. Results show that the 60Sn-40Pb and 35Sn-40Pb-25Bi combine with H₃PO₄ have good wettability on 304 stainless steel; the 60Sn-40Pb and 35Sn-40Pb-25Bi combine with 50% H₃PO₄ and 50% glycol have good wettability in the brazing experiment and the Sn-3.5Ag has relatively poor wettability.