Bruce in Bangkok wrote:
On Sun, 30 Mar 2008 17:55:34 -0600, Paul Cassel

That is one theory but (1) you can't weld a portion of a normal (thin)
tank that is in contact with water as if you get 100 penetration your
filler metal comes in contact with the liquid and (2) if you are
welding above the water level there is room for explosive gasses to
accumulate.


I didn't envision it this way. I figured you welded a patch of similar
material to cover the hole much like a patch on an inner tube of your
bicycle. Thus you could lay a bead all around the patch effecting a
repair on a tank 100% filled with water.

I did some welding once but not on tanks. IIRC that was how the real
welders were doing it.

-paul