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5 years, 8 months ago
In my previous question I focused on lead-based solder alloys (see
Best solder wire - Sn63Pb37 vs Sn60Pb40 vs ...?).
Some of you brought new exciting solder alloys to my attention. The two most promising types contain either
Bismuth or Indium.
How do they compare to each other on properties like:
wetting of pads and pins
interaction with fluxes
joint strength - brittleness (is this directly related to the "tensile strength (PSI)" column in the table below? Please enlighten me.)
How do they compare to standard solder alloys, like Sn60Pb40?
Most of them are sold without flux core. Wouldn't that make the solder process very difficult?
What kind of flux should one use with Bismuth and/or Indium based solders?
Perhaps the following table might be of help:
This table comes from "Indium Corporation".
Sep 20, 2017 at 17:24
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They are very expensive. Some of them are outright forbidden (e.g. all Cadmium based alloys). These special alloys are made for special needs: Low temperature soldering (e.g. if you have a 100°C thermal fuse, you cannot solder it with normal solder), low EMF (e.g. if you want to measure voltages with <100µV of accuracy), etc pp. Unless you are doing very special stuff you will not need them.
Sep 20, 2017 at 17:48
Attila Kinali Attila Kinali
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Soldering alloys have many properties that target different applications: malleability, melting point, solidification point, expansion, etc. See this selection from major supplier,
Indium Corporation. There used to be some open tables with bunch of parameters, but I can't find it easily.
Sep 20, 2017 at 18:15
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