How can I fix a leaking fuel tank, to my International Harvester tractor ?

Diesel fuel tank leaking around the retaining strap that were spotwelded in the factory
I want to retain the original tank, Does anyone know how it can be repaired. Have considered seam welding around the straps (The tank has been removed washed out and well vented for several months) but would prefer a safer method. Does anyone know if there is repair material or a fuel tank lining service, preferably in the south west