Posted by Michael Gilligan on 15/01/2020 17:28:54:
Quite honestly, Chris … I doubt if you need the ‘Smiths Little Torch’ **LINK**
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I agree, it might even be unsuitable being on the small side. Not cheap, £200 for nozzle and tubes, then sort out your own gas. (Though Cookson do sell a suitable Oxygen Generator for £500.)
Jumping from 'two Micro-butane torches' to a mixed-gas ‘Smiths Little Torch' after one attempt at Silver-soldering may be premature. Much depends on the size of the job : what's appropriate for jewellery certainly won't do a boiler or vice-versa. My experience for what it's worth is with items weighing about 50g. For these building an insulated cave is vital as is a suitably powerful torch. Mine is a small Propane Sievert, only about 1kW, but it comfortably outperforms a DIY-store butane torch. It's not powerful enough for big jobs, and even smallish ones need care. One thing to avoid is spending several minutes getting metal hot enough to melt solder with an underpowered heat source – the flux burns off. For that reason, a big torch makes soldering easier because it can blast heat in quickly.
Acetylene burns with a very hot flame and, with an excess of oxygen, can cut steel. It's likely too hot for other metals, unless welding is the goal. For ordinary heating purposes, the other gases are as effective and much cheaper. Butane isn't ideal for metal working because it burns at a lowish temperature. The Smiths Torch is a precision Tich, I suspect too specialised.
Can you define the scale of work and metals more precisely? From what's been said, I'm thinking a smallish propane torch without Oxygen for soldering and brazing ounce sized items rather than micro-welding or boiler work. But I'm only guessing from what's been said in other posts about clocks and Sherlines etc.
Dave