The only trick I know to welding bronze with the TIG torch is to really pour on the power right at the start, to overcome the conductivity of the metal. As soon as you get a puddle to start forming, back off the amps to where you can just maintain the puddle. You'll still get some fuming off of the zinc, which is why I mostly only work with silicon bronze - no zinc and a perfect color match on the welds.
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Welding
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The only trick I know to welding bronze with the TIG torch is to really pour on the power right at the start, to overcome the conductivity of the metal. As soon as you get a puddle to start forming, back off the amps to where you can just maintain the puddle. You'll still get some fuming off of the zinc, which is why I mostly only work with silicon bronze - no zinc and a perfect color match on the welds.