I was wondering if you could help me, I am a jeweller in the U.K
about to set up a workshop and looking for some advice. I have a
mouth blow torch (the sort you blow into to get intense heat) I am
thinking of using this type of torch with bottled gas, do you
think this is possible?
Yes it is. I have a torch with air supplied by my breath, and I use
either disposable propane tanks, or the 5 gallon tank used for
outdoor barbecue grill.
I am assuming you have experience with this type of torch. If
not...there are very select types of situations where this type of
torch is beneficial. I would not use this for jewelry repair work.
This torch is best for fabrication.
With a mouth blow torch, you have control that you do not have with
any other torch, when you get close to the temp to melt the solder,
you can control the pressure of the oxygen, and slow the rate at which
the temp rises. You can reduce the pressure, and hold the temp at a
certain place where the whole piece will become cherry red, the
solder flows, yet not melt your elements.
This is important when you are soldering small wires to larger
pieces,. and this is particularly useful with sterling, as you must
get the whole piece up to the temp where the solder will flow at the
place where you are trying to attach a thinner piece to a heavier
piece.I have less problems with solder flowing from previous joints,
even if I use the same solder for multiple joints close together.
This type of torch is excellent for fusing metal, and fusing high
karat gold to sterling for doublee. This torch has a broad bushy
flame, so you have to learn how to use the edge of the circle the
flame produces to do the work, as the center will heat to hot, and
you will ruin your work..
It takes a bit of getting used to to coordinate holding air in your
cheeks and using this air to breathe out, while inhaling though your
nose to replenish your lungs. You also must fiqure out what to do
with saliva while you are holding the mouthpiece in your lips. It
helps if you do not tilt your head down, sending the saliva down the
hose. If out of anxiousness, you tend to hold your breath while you
solder, you will have trouble using this type if torch.