Welding different steels.

[ldavison10]

Hi,
Im looking for advice;

Can you weld stainless steel rainwater outlets into a galvanised mild steel gutter?

when googling this question i get varied responses from plain 'no' to 'yes but with a special flux'

Thanks

Lee

 

[metengr]

Yes you can. You need to locally remove the galvanize layer, weld using E309 and re-coat to provide corrosion protection.

 

[strider6]

I agree with metengr, is possible to weld SS to galv cs.

"When welding stainless steels to galvanised steel, the zinc coating around the area to be joined should be removed before welding. Molten zinc if present in the weld fusion zone can result in embrittlement or reduced corrosion resistance of the finished weld."

http://www.bssa.org.uk/topics.php?article=101

another issue is the possibility of galvanic corrosion between SS and galvanized steel, considering also that there will be water flowing inside.
maybe it would be better to find another way to connect the two materials..

S.



Corrosion Prevention & Corrosion Control