"Smitty Two" wrote in message
news
In article ,
"William Sommerwerck" wrote:

Any desoldering method sometimes needs a bit of fresh solder to
"loosen things up" so the solder can be sucked out of the hole.

Nuts. It doesn't need fresh solder, it needs fresh flux. The fresh
solder contains the flux, but it also contains a healthy dose of what
you're trying to remove. Much better to just add a drop of flux.

The solder in a joint can wind up having a much higher melting point and
much less wetting ability than it did when it was initially applied. That's
because it amalgamates to the material being soldered to some degree. If the
joint was the least bit overheated initially, or upon re-heating for
removal, it can be a fairly high degree.

You notice it more trying to unsweat copper plumbing. Sometimes you have to
wet the joint with some fresh solder to get it to come apart. But I've run
into the same thing taking components off of an old board.

--
Ed Huntress