4 Jun
2006
4 Jun
'06
10:08 p.m.
On 6/4/2006 at 10:07 PM ard at p850ug1.demon.co.uk wrote:
A friend of mine who should understand this has told me
it's OK to solder
modern, lead-free components with leaded solder (and to solder them onto
old boards with lead 'tinning'), but not to use lead-free solder on
leaded parts. So I should be able to buy, say, modern lead-free resistors
and solder them with leaded solder into my PDP11s.
That's true--leaded solder will contaminate lead-free and cause it to
weaken considerably.
But then, that's the case of lead in combination with any other
soldering/brazing material in general. When I silver solder (well,
actually silver-braze) old botched repairs in brass that were done with
tin-lead solder, I have to remove every last bit of the leaded solder
before I can braze. Otherwise, the lead will make the silver (56% silver,
the remainder copper) braze very brittle and it will fail in no time at
all.
Cheers,
Chuck