Re: Can you weld SS304 to zinc-plated ASTM A53 without corrosion?

In article <1137107222.622630.10780@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, "Bill"
<billh234@xxxxxxxxx> wrote:

> Harry,
> Thanks for the reply. Plastic wouldn't work because the product is
> used in the fire industry and standards require the pressure retaining
> elements of the assembly to be metallic. The assembly must withstand a
> burst pressure of 875 psi. Asssembly has to pass a salt spray
> corrosion test (20% NaCl fog/spray at 95 degrees F for 10 days with no
> evidence of incipient corrosion).
> Bill

Much better information. You could braze the joint, but I would recommend
that the assembly (at least the Zn plated section) be painted after braze
with a Polyurethane paint, with the paint extending about 1 inch past the
braze joint . Powder coating is best and I'm pretty sure that you can get
PU powder coating done pretty inexpensively. (Polyurethane BTW works
better outdoors than other paints because it chalks less).

--
Harry Andreas
Engineering raconteur
.

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