IIRC We always welded them and then did some annealing process to soften the
weld so it wasn't brittle by giving shots or current after the weld and
grind. Been a long time since then...LOL


"Ned Simmons" wrote in message
news I've only welded blades, not brazed them, but I'm going to guess the
blade is cooling fast enough to quench it, making it brittle. After
you've made the joint remove it from your jig, shine it up with
sandpaper, then heat it gently by waving your torch flame around 'til
the steel turns blue. You've tempered the steel enough that it should
no longer be brittle.

--
Ned Simmons

On Thu, 10 Jun 2010 17:39:31 -0700, "Artemus"
wrote:

Obviously I'm doing something wrong here as my joints are brittle
and don't hold worth squat. I ground the ends of the blade to about
45 degrees and cleaned the ends with sandpaper. I put on plenty
of flux and wedged a small piece of silver solder in the scarf joint.
Both ends are held in a jig so nothing moves during the soldering.
The saw blade is 3/16 wide and .025 thick. I'm using oatey 53013
silver solder. I'm using a propane torch w/ pencil tip burner.
I've tried heating just till the solder melts & flows, and hotter, up to
the blade turning a cherry red. Nothing worked.
So what am I doing wrong? technique? Wrong solder?