In general, it is safer to use a single alloy with a known composition and performance characteristics. If you need to change the alloy used in your selective soldering machine bath, it is advisable to consult with the manufacturer or a soldering expert. They can help you identify an appropriate replacement alloy that meets your specific requirements without the risks associated with mixing different solder alloys.
Regarding a comparison of Sn99Cu07 and Sn100 (Sn100C, Sn100Ni+), these alloys are both lead-free and widely used in electronics manufacturing. The choice between them depends on your specific application requirements.
Mrs. Tina
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