Repairing a steam heater...a few questions.

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Ok, well I am in the process of repairing one "core" out of a multiple core cast iron steam radiant heater.   There is a crack that runs from the bottom of one side up around and about 12" on the other side.  I've drilled the ends, beveled the edges, and welded it with NI-99 filler rod.  Now the problem is, it's not 100% sealed.  The flame that heats this is right underneath it, and so I need something that is high enough temperature to withstand that flame AND seal it air tight.  Would brazing over the NI-99 be a good idea?  Withstand the temperature of the flame and seal it up?  Other ideas/suggestions?  Will be running into a time crunch here shortly.  Thanks.  Last edited by montgoc3; 12-18-2011 at 11:21 AM.
Reply:Brazing would be fine.  Heat the whole thing first and cool it slowly.   Cracking is  your biggest problem.DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:Great, thanks David!