I have been using the air/propane blowpipe that is available from
Frei and Borel (114.010, pg 35, $89.95) for about 10 years now and I
really like using it for granulation. Once you get the hang of it,
it's really quite simple. It will produce a broad, neutral or
reducing flame that is ideal for most soldering. Once the granules
have fused, just stop blowing and keep the torch on the work. You now
have a reducing atmosphere. Keeping the work inside the flame, just
slide it into water. No fire scale...
As a apprentice, I had to learn to solder with a blowpipe before I
was allowed to use a torch. It is amazing what you can learn about
soldering, flame characteristics, and oxidation from this simple
operation. Most goldsmiths use too much oxygen in their torch flame,
and too much pressure at the regulator. Soften your flame, and you
will be amazed at how much easier it is to get solder to flow. You
can even start fusing bezels without solder, like a pro, in no time.