Which Sievert Torch ?

[Clive Joseph 2Participant @clivejoseph2]

[Clive Joseph 2Participant @clivejoseph2]

Hi,

Looking for advice please

Which Sievert torch do I buy ?

I am in the process of building a steam engine and will need to silver solder a boiler in the near future. The boiler dimensions are approx 3" dia x 6" long. I would also like to get a burner suitable for smaller jobs i.e. fabrication of a small crankshaft (3/16 dia shaft 1/8" mild steel webs)

Any guidance would be greatly appreciated

Thanks in advance Clive

[Clive Brown 1Participant @clivebrown1]

I've not used Sievert burners very much, but based on my Bullfinch torch, a burner rated at ~10kw should be adequate for your boiler, especially if you use firebrick lagging. The cyclone burner is around that rating and is nice to have for some jobs. Next size down would be OK for your crankshaft, but my smaller size burners don't get a lot of use. Nice to have plenty of heat.

[David George 1Participant @davidgeorge1]

Hi the 2941 torch is probably the one for you can get a kit with burner hose regulator etc from Cup Alloys and you can call them as well as have a look at their web site. I have diferent nozzels for diferent jobs as ie a boiler needs more heat to brazing a carbide tip to a shank to make a turning tool. You also need to have a hearth suitable for the job to keep the heat where it is needed to allow the solder to flow.

https://www.cupalloys.co.uk/store/Sievert-Professional-Torch-Kit-p276411663

David

[Andrew TinsleyParticipant @andrewtinsley63637]

I find the modern Sievert torches (especially the pilot light version) to be expensive. I have a very comprehensive range of both Sievert and Bullfinch torches and burners. I much prefer the Bullfinch range. Hamilton Gas do both ranges at very competitive rates.

Clive's recommendation for burner sizes is on the money. I would always go up on burner size, you can always turn down the regulator to suit. The usual problems that people find when starting silver soldering is they don't have enough heat. A good brazing hearth is essential in my view.

Andrew.

[Keith HaleParticipant @keithhale68713]

Hi Clive.

Clive and David are setting you off with a good start. Sievert probably have the widest range of burners to satisfy your needs and suit your requirements.

Start by getting a variable 2 – 4 bar regulator and a 2941 burner. At 2 bar this will generate approx 7.5 kw. Wind it up to 4 bar and you will get 14 kw. That little bit of extra heat is a useful bonus.

Gas consumption is approx 600 and 1200 gm per hour. These are useful figures as they will enable you to make an informed decision on the size of cylinder you require or may have to hump around!

Knowing the tare weight of the cylinder will enable you to determine how much longer tho cylinder will last.

For lighter work, set the regulator to 2 bar and fit a 3941 burner. All sievert burners have the same thread and as such are interchangeable. The 3941 burner will generate 3 kw of heat using 240 gm of gas per hour.

Two burners for the price of a cyclone burner with the ability to create better, more controlled heat patterns to encourage the capillary flow that is essential for the production of good, strong leak free joints.

How much hose do you want?

Fit a necktube about 150mm long. It keeps the hand away from the heat yet still offers good control. All necktubes are interchangeable.

In my experience, most model engineers opt for a simple no frills handle ie one that has to be relit with each use and does not have a pilot light facility. They are cheaper.

Over to you.

Do you want a kit or buy individual pieces. I suspect that you will do both!

Hopefully you now have some ideas as to establishing your requirements and can ask your supplier the relevant questions to determine what is the best for you.

Keith

But Sievert is the way to go.

[Andrew TinsleyParticipant @andrewtinsley63637]

I suppose ones preference for torches and burners is a very personal thing. I have and use both Bullfinch and Sievert kit and I prefer the Bullfinch range. I have not checked recently. but I believe the Bullfinch range is a touch cheaper than the Sievert gear.

Regards,

Andrew.

[Dave Smith 14Participant @davesmith14]

Bought this off ebay 2 weeks ago good service, you need to add a regulator (I already had one), but significant cost saving over other outlets. Then bought additional nozzles and neck from Hamiltons.

Sievert Pro 86 Propane Gas Torch Kit 219742 | eBay

Dave

[Clive Joseph 2Participant @clivejoseph2]

Thanks to all for advice

Sievert pro 86 kit ordered 2941 burner, variable regulator, 3941 burner and neck tube

3 different suppliers to achieve 'in stock' and best price

Thanks again Clive

[Author]

Posts