Here's how I've done it.
I made a jig to hold the blade and then removed a circular area of the jig where the scarf joint is made. I let the blade ends overlap in the jig and position them over the circular cutout of the jig. Then I take a Dremel with a cutoff blade and cut on a compound bias to achieve more holding power. I hammered some of my silver solder lat obtained from the welding store, slipped it between the joint and fluxed it. I then heated it up with a soft flame till the solder melted. The joint damn near fell apart when I released the two bolts holding the blade to the jig.
1. I think I should have annealed the blade before trying it.
2. I think I've had the blades bolted to tightely into the jig and the blade weakend when it cooled down and retracted/shrunk.
3. I'm trying all this on bi-metal blades and don't know if that is part of the problem?
My jig worked extremely well for holding the overlapping blade ends for cutting on the bias with the dremel. That much worked fine.
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