Question about TIG with silicon bronze

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What is the procedure for repairing a crack with a TIG and silicon bronze rod? Is the TIG electrode not pointed at the base metal at all to keep it from melting?
Reply:Pretend you are welding steel but less heat. You are barely glazing the base metal. What is the base metal?Weld like a "WELDOR", not a wel-"DERR" MillerDynasty700DX,Dynasty350DX4ea,Dynasty200DX,Li  ncolnSW200-2ea.,MillerMatic350P,MillerMatic200w/spoolgun,MKCobraMig260,Lincoln SP-170T,PlasmaCam/Hypertherm1250,HFProTig2ea,MigMax1ea.
Reply:Cast iron.