Welding stainless steel to mild steel

[picocg]

I want to replace a 4 inch threaded thru-deck corroded steel fitting with a similar sized stainless steel NPT fitting used as an access for the emergency tiller arm on a 50ft motorized landing craft. Can a stainless steel pipe coupling be welded to a steel deck without short or long term consequences? If not what are my options? If so please specify the method.

Regards,

 

[EdStainless]

You can weld it. However painting will be very critical.
The steel deck next to the SS will be susceptible to accelerated corrosion if the surfaces are not well painted.

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Plymouth Tube

 

[picocg]

Thanks EdStainless. Will certainly give that area special attention.

 

[strider6]

here you can find some info on galvanic corrosion mechanisms and prevention of galvanic corrosion:

http://www.npl.co.uk/upload/pdf/bimetallic_20071105114556.pdf

http://www.corrosionist.com/Galvanic_Corrosion.htm

hope this help

S

Corrosion Prevention & Corrosion Control

 

[picocg]

Thanks strider6! Corrosion is huge in my line of work. These sites will come in handy.