Hi Raygers, I think this should be OK, as you are obvious careful and precise and I expect that you will naturally have the same approach during the soldering process.
The only real risk I can estimate is that when soldering the firebox end of the tube array into the firebox, the outer tubes will receive a lot of heat (- so expand more, being hotter, than the inner tubes). If you can get some heat into all the tubes from the far end you can reduce the outer-inner differential and thus ensure no cracking, from differential expansion/cooling between outer and inner tubes.
Enjoy!
Ken
The only real risk I can estimate is that when soldering the firebox end of the tube array into the firebox, the outer tubes will receive a lot of heat (- so expand more, being hotter, than the inner tubes). If you can get some heat into all the tubes from the far end you can reduce the outer-inner differential and thus ensure no cracking, from differential expansion/cooling between outer and inner tubes.
Enjoy!
Ken
