Can bronze be tig welded/brazed? I know silicon bronze rod can be used with iron based metals but I had a local artist call me today and she has a small part that is cast from a silicon bronze material and has a crack. I do not have a torch set so I can not braze it, the only thing I have available right now is my tig welder.

I am afraid that if I heat it the part is just going to melt away and I will have ruined a nice casting. I was thinking about trying to make an aluminum backer to support and draw heat out of the part.