Making use of the cool change, it was time to tackle the boilers again.
Next job was attaching the bottom dome flange to the boiler barrel. Previously described was the clamp to hold the barrel in the mill to cut the hole with a holesaw.
The bottom flange was marked from the interior of the boiler barrel to give the curved profile. A straightforward angle grinder job, and finishing off with files.
The dome flange was fluxed and set up in the barrel checking for square off the firebox. Firebricks set up to conserve heat around the boiler, and preheating done with a Sievert 110kw burner on LPG.
Silver solder work was done with a Comet #12 heating tip, which I find is just about right for 3mm copper. It's not too intense but has a bit of reserve.
Happy steaming!
Nigel
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