[modeleng] Re: New boiler test rules
- From: Harry Wade <hww@xxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Sun, 15 Jan 2006 18:04:16 -0600
At 11:16 PM 1/15/06 -0000, you wrote:
>The dezincification does not take place in the copper but if the wrong
>jointing material is used it takes place in that.
>For instance it happens if Phosphor/copper brazing rods have been used. The
>tell tail sign is that as the zinc leaches out the material goes pink and
>feels greasy - Regards, Clif
Clif,
That's what I thought was meant, but I wasn't sure. I have a Maid
of Kent whose boiler I had to discard right out because (among a number of
other badly done things things) the joining was done in yellow brazing
alloy. I was not about to wait for it to fail.
Generally we assign other shortcomings to phos-copper, not normally
dezicification, but alloys do vary and this contributes to the position
held by many of us, which we would like to see accepted as universal, that
phos-coppers are inappropriate for boiler work. The manufacturers say as
much. Unfortunately we still have folks whose primary concerns are
quickness and cheapness who continue to criticize silver soldering as an
unneccessary trouble and expense.
Regards,
Harry
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