MJ> hey you guys!!! How would one silver solder steel? What flux,
MJ> what solder. Would brazing be better.
MJ> Marshall Jones
G’day; You silver solder steel exactly as you would hard-solder
brass, silver, gold, etc. You can buy thin rods of silver
solder. 1/16 dia. from the same company which supplies industrial
gases such as oxygen, the solder is usually called “Easy-Flow”
(Much cheaper than from a jeweller’s supplier) and the flux used
has the same name, or if different in your country, the supplier
of the rods will tell you. It does contain fluoride, so don’t
breathe the fumes, and DON’T drink the paste you make up.
Mix a little of the powdered flux with enough water to make a
paste and apply it to the CLEAN surfaces to be joined, or you can
simply dip the end of a hot rod in the flux and apply it direct to
the heated work. However, plain borax is almost as good. But
remember that you can’t build up silver solder and that the pieces
to be joined must fit together well with absolutely no gaps.
Brazing is much stronger and fillets of the metal can be built up
around a joint - it doesn’t flow quite like silver or gold
solders. Buy the brazing rod - they sometimes call it “Bronze
Welding Rod” - and the special flux sold for the purpose from
the gases supplier. Don’t make a paste with brazing
flux; apply it by dipping the hot end of a rod into it, then
heat the work up to red heat and apply the fluxed rod. The
technique isn’t difficult, it just requires a bit of practice to
get the hang of it. BUT: silver solder and
brazing don’t take well on to stainless steel. Have fun!
/ / John Burgess,
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