[TheForge] gas tank repair

[C&J Allcorn]

I've got a maybe 40-50-60 year old SA-200 welder and discovered a leak 
in the bottom of the gas tank recently (obviously caused by years of 
condensation, rust, etc.).  It's a good old stick machine and I'm going 
to need it for a fencing project out on a ranch in the near future.

I looked up the cost of a new tank and I'd rather take a stab at repair 
than replacement.  Haven't taken the tank out yet so don't know how 
large the affected area is but suspect if it has rusted thru at the 
lowest point, that likely there is a "rust-affected" zone adjacent, 
probably at least a couple inches in diameter from the actual hole.

I'll probably either fill it with water to weld/braze/solder - whatever 
- due to potential explosion hazard or possibly inject nitrogen.

The metal is probably pretty thin and while I'm a pretty good hand with 
TIG, I know my limitations, especially on really thin stuff.  So that 
leaves braze or solder?

What's the best way to repair that gas tank?  A patch of some sort?

James

Paris, TX