Aluminum brazing alloys have relatively low melting points, good wettability and joint filling performance, and sound anti-corrosion properties. Among these products, aluminum-silicon solder and zinc-aluminum solder are more commonly used. Zn-Al solder is usually combined with CsAlF4 eutectic flux to make flux-cored brazing alloys, which are widely used to braze aluminum-copper joints in transformer and refrigeration industries.
Al-Si eutectic-based brazing filler metal is mainly used for brazing of aluminum and aluminum alloys. When brazing copper, nickel is usually plated on the copper surface to reduce the effect of brittle
compounds between aluminum and copper. It can be used in flame brazing, induction brazing, furnace brazing etc., and it can form joints with high corrosion resistance.
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Standards
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Composition %
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Melting Range
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ISO 17672
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EN 1044
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Al
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Si
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Zn
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ºC
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|
Kupa 178
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-
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88
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12
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710-925
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|
Kupa 179
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CP 203
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90
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10
|
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710-890
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|
Kupa 279
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CP 105
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2
|
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98
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385-400
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