Thread: why 60-40 solder?
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Lostgallifreyan Lostgallifreyan is offline
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Default why 60-40 solder?
wrote in news:a232ec67-c9bd-42ad-99f3-
:

why is 63-37 eutectic solder not universally preferred?

Probably because the gradual solidification makes dry joints less likely.
I'm not even sure it it does make them less likely, but I bet it does
because you're not relying only on ductility of a solid to maintain good
structure during thermal contraction. If the two metals in the alloy don't
solidify together, one can flow to fill pores that might form in the other,
or between the solder and the parts joined with it.
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