The 45% stuff melts at 1200-1300 range, while the 4-6 percent stuff
melts around 430F.

There's a solder paste called "solder-it" that comes in a syringe and
is FAR stronger than any of the Radio Shack junk I've tried to use in
the past. Can't comment on Lead content. Flux seems to work nicely
on ferrous, copper, brass... /mark


Robert Swinney wrote:
Obtain some so called "silver-bearing solder". It is usu. marked as 4 or 6
% silver and 96 or 94% tin. This solder is readily melted with ordinary
propane tarches. Use acid flux (liquid) ordinarily sold as dilute
hydrochloric acid. Joints made with this solder and flux are fairly strong,
with tensile strengths usu. as good as the base metal (that is, copper,
brass, etc). An advantage of silver bearing solder is the comparitivley low
melting temperature. The temp. is low enough, around 1000 to 1300 deg.,
such that it is not apt to cause warping.