[modeleng] Re: TIG welded copper boilers

Dunno, but the time honoured test for the weldability of copper is to 
heat a sample up and bash it with a 'ammer - if it crumbles it can't be 
welded.

peter.chadwick@xxxxxxxxxxx wrote:
> I read that 12 inch to the foot models need an arsenical copper for 
> fireboxes, and it's hard to get. What is so special about arsenical copper 
> in this applications?
>
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