The third heating involved fitting and soldering the firebox side of the throatplate stays and the first set of side stays then the outside of the roof stays.
After each stage the boilers were pickled and inspected to see that solder penetration was adequate. Whilst the inside seams are visible they have to be shown to the club boiler inspectors who need to see this themselves, for certification purposes.
Stuart starts to heat with propane burner & adds flux where necessary
The throatplate stays are done first
In passing, tidying up the flange plate seam
Reheating to start the side stays
When the flux looks like runny egg white it is time to start soldering
Whilst working down the box, cooling meant the solder stopped flowing freely
So reheat with the propane
Finishing the last row.
A last inspection before finishing the sidestays
Heating before soldering the outside of the roof stays
Starting the roof stays The flame away from the rivet
The second row of stays Flux running down the stays
The solder follows the flux through the gaps created for it Yellow cadmium deposits. Stuarts hearth is well ventillated.
I am to blame for the deficiencies in the copperwork!
The firebox side of right hand side stays soldered
Check out stay 4 up & 3 from the right. This was resoldered when the opportunity arose
There appears to be good silver solder penetration into the water space on all the stays.
Showing silver solder penetration from the outside on all the stays