In message <[email protected]>, 
dated Tue, 29 Sep 2009, Bill Stumpf <[email protected]> writes:

>From experience, galvanized metal sheet works pretty well but is 
>difficult to weld or solder. 

Yes. Welding is compromised by the zinc coating, which oxidizes and the 
oxide evaporates as copious white fumes. Not pleasant.

Soldering works if you use the right flux (ammonium chloride) and enough 
heat, but not too much. At least, it does with 40/60 Sn/Pb plumber's 
solder. I don't know about lead-free solders.

You might also investigate hard soldering with zinc-based solder and/or 
bronze brazing, but the latter would probably fail through electrolytic 
corrosion.
-- 
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
Things can always get better. But that's not the only option.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

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