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Sand off the top surface well and clean with alcohol you should be fine, as low a heat as you can get away with and a shade 9 lens so you can see, I would really recommend running an argon purge to the inside of the tank.
You can also try using a sharp prick punch right beside where the leak is to form material over and close the crack.
EDIT, If you can't purge the inside try about 55-60A but move the torch along pretty quick so you only penetrate 1/2 way through the material, that should keep the inside of the tank from getting badly oxidized, should not need any filler wire.
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Last edited by 908/930; 11-30-2022 at 12:45 PM..
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