Hello Fellow and Gal gassers,
Darned if the beta version isn’t a lot of work, but I love seeing it come together.
pic 1, pic 2. I used 1/2" square stock for the heat sink rim. Draw a line around the shell with a compass. Clamp bar on line, heat to brilliant orange almost yellow keeping a light steady pressure on the bar. When the temp is just right you will feel the bar start to give (bend). Spread the heat out and the bar should wrap in place, Keep the bar on the line while it’s hot. Maybe a hammer rap to help it conform.
pic 3, pic 4. Finished blank for heat sink rim. Use a straight tank for a form if you have one. This was tight getting it over the flange, almost deformed it.
pic 5, 6, 7. Insert ring into burner tube, adjust it flush with the top of the flange holding it with clamps. Tack weld there. Move around the rim, heating and beating to conform and tack welding til done. You can see now how the inside cut of my flange doesn’t meet the inner tank circumference evenly. I had to struggle to get started as I wanted to keep the heat sink inside the tank and it kept slipping up.
pic 8, pic 9. Now to fill in the spaces and grind the welds flush with the flange.