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Old 10-07-2008, 22:46   #1
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steinless steel fittings on steel boat

Hello to all,

I am a new user. I own a 30' steel sailyacht constructed in Cyprus. I intent to change the drains on the cockipt. My idea is to use steinless steel pipe which will be welded on the mild steel plade. Previously the boat had drain pipes made with steel and was totally destroyed by rust.

I have a very slight idea about galvanic corrosion when two dissimilar metals are welded together. My question is doable without any galvanic problems? This installation will be above waterline.
I would appreciate views on this...
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Old 10-07-2008, 23:30   #2
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It will work fine. You need to use the correct mig wire or rod to weld them in. Dont use a mild steel type wire. There is a lot of information on just this subject Stainless Steel to mild steel on the Metal boat society web site. www metalboatsociety.org
Needless to say your galvanic protection needs to be in good shape regardless.
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Old 17-10-2008, 19:58   #3
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If you're stick welding, use 309L rod. It's made for welding stainless to steel.

Regards, Paul
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Old 17-10-2008, 20:28   #4
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Yes, the stainless on mild steel is fine. I've just replaced my deck drains with 316 stainless. They'll be painted same as the deck. My welder didn't see a problem with it and was in favor of the 316 Stainless.
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Old 14-03-2009, 04:33   #5
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See the Miller “TIG Welding Tips” for a good primer:
Miller - TIG Welding Tips - Intro
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Old 14-03-2009, 07:03   #6
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metal boats

There's also another forum for metal boats: www.metalboatbuilding.org , which started recently.
Lots of info and answers.
And as others have said, 316 cockpit drains will work fine.

Best, Bob S/V Restless
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