At one point in my checkered career, I had to qualify as a NASA soldering
inspector as part of my job with an aerospace outfit (Itek Corp).

I recall that the solder must be shiney (to prevent a cold joint) and well
wetted out, but the main point was that the solder was not wicked up the
wire strands to a significant degree, although at this point I don't
remember exactly how much "significant" meant.

I had trouble understanding this concept because there was *always* a hard
point where the solder/wire transition began, no matter where it began.

Norm
S/V Bandersnatch
Lying Julington Creek
30 07.695N  081 38.484W



> The failure always  happened at the point where the solder wicking up
into the strands formed a hard point.


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