In article ,
"Ronald Murray" wrote:

Not having great luck. I have some rolls of bandsaw blade stock. Any hints
or tips greatly appreciated. Can flux go bad or get contaminated? It seems
the solder melts but doesn't have that nice flow , but instead just lumps up
into a nice cold solder joint. I cleaned the joints well , but when I apply
the heat til it gets red hot I get this black gunk gathering at the ends of
the blades. Is there a different flux for non ferrous & ferrous metals? I've
silver soldered before with great success.Thanks.

I believe flux can go bad. I've not soldered B/S blades, but this past
winter I was intalling a new bath & shower control valve. The flux I had
on hand caused the solder to behave exactly as you described. I bought a
new container and the soldering went smoothly and flowed just as you
would expect.

--
Owen Lowe and his Fly-by-Night Copper Company
Offering a shim for the Porter-Cable 557 type 2 fence design.
http://www.flybynightcoppercompany.com
http://www.easystreet.com/~onlnlowe/index.html