IMO you will struggle for sufficient heat with your Sievert nozzle. To succeed you'll need very good insulation around the job. I see no reason why you couldn't try with 455 for the entire job to give a better chance of sucess.

I think that I'd treat myself to a burner nozzle one or even two sizes larger.

Clive

Hi Adrian,

A question I often ask, Why didn't you ask your supplier of equipment and silver solder?

They are not a company that simply takes your money and leave you to get on with it. You can draw on the 100+ years of collective experience to help.

A couple of years or so ago, they were demonstrating with the help of Western Steam, the building of a similar boiler at the Midlands exhibition.

Who knows. As a customer, their technical support is included in the price of the silver solder.

Regards

Keith

Hi Adrian,

And thanks to Bill.

With one eye on the Antiques Roadshow!

if you bought the torch kit from CuP, you already have a bigger burner generating 7kw of heat.

If you didn't, then you have a choice. Buy a bigger burner or improve your chances of success by insulating the joint better with an insulating blanket. Readily available from CuP.

No reason why you shouldn't be able to make all the joints with 455.

Regards

Keith

Declaration of interest – despite retiring 7 years ago, I'm still on their books!

As anyone who has tried to dismantle a silver soldered joint will know, it takes a lot more heat than it did to solder it in the first place.

If you're careful with the sequence of assembly and the amount of heat used on joints already made, it is easily possible to make a small boiler using only one grade of silver solder such as one containing 55% silver.

CuP Alloys is an excellent place to start (usual denials)

Brian

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Thanks Kwil.

Brian