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Hi
Propane is fine to use for silver soldering. I use a Sievert torch for silver soldering and the size of nozzle can be changed to suit the application being under taken. However, Mapp gas is the way I solder the blades purely for convenience, as it is a hand held torch with no hoses.
I will try to do the video this weekend and post.
There are several grades of silver solder and the main difference is silver content, which alters the temperature and price. I use what was, called easy flo, (which I think? is known as 455 now) which has a melting point of 630-660 degree C. This is classed as low temperature silver soldering and the flux I use is the high temperature HT5 Flux Powder. This means I only have to buy one flux, which covers all the materials I will be soldering in my shop.
Hope this helps
The Home Engineer
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Dear Home Engineer, I was forced too to switch from welding to silver soldering. (thanks to HMT...) Soldering requires more diligence but doesn't fail. The inclination of my grinding is about 2:1. My jig has more space for the flame: 40mm lengthwise and 40mm in the back of the blade. The upper part of the clamps is 12mm wide and 4mm thick - kind of a toolmakers clamp with 2 screws. The lenght of the guide for the back of the blade (left and right side each) is 80mm - the longer the easier to adjust the blades. That helps to get the back of the soldered blade straight. If not, noise and (the imagination of) dynamic stress disturbs you. I file the excess of solder and misalignment with an extra hard 'Corinox' file.