[modeleng] Re: steel boilers & Cu flues

Thanks for the comment Harry,
The reason I launched this question,was, the fact that Cu expands a lot 
more then Fe does.
I know that,since all the Cu parts will be immersed in H2O, the delta T° 
will not be so much, but I still wonder, if this wouldn't have an effect 
on loosening the tubes in the flanges.
On the note of rolling versus silver solder, I too believe, that rolling 
is to be preferred, if it was only to make replacing tubes simpler.
Cheers
Patrick

Harry Wade wrote:

>At 07:55 PM 9/17/07 +0200, you wrote:
>  
>
>>I intend to make a boiler (a test boiler) - Patrick
>>    
>>
>
>Patrick,
>     This is common practice amongst steel boiler builders over here and
>makes for a good combination.  The only disagreement among builders is
>whether to silver solder or roll the flue ends.  Since I am a copper boiler
>builder I have no choice but to silver solder but were I to build a steel
>boiler I believe my preference would be to roll the flues rather than solder.
>
>
>Regards,
>Harry Wade
>Nashville  Tennessee
>
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