steinless steel fittings on steel boat

Gregoris · 10-07-2008, 22:46

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...

cooper · 10-07-2008, 23:30

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.

Pauls · 17-10-2008, 19:58

If you're stick welding, use 309L rod. It's made for welding stainless to steel.

Regards, Paul

usa-068 · 17-10-2008, 20:28

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.

GordMay · 14-03-2009, 04:33

See the Miller “TIG Welding Tips” for a good primer:
Miller - TIG Welding Tips - Intro

bob kingsland · 14-03-2009, 07:03

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

10-07-2008, 22:46	#1
Gregoris Registered User Join Date: Jun 2008 Location: Cyprus Boat: steel 30' sloop Posts: 2	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...

14-03-2009, 04:33	#5
GordMay Registered User Join Date: Mar 2003 Location: Thunder Bay, Ontario - 48-29N x 89-20W Boat: C.L.O.D. (Cruiser Living On Dirt) Posts: 12,575	See the Miller “TIG Welding Tips”* for a good primer:* Miller - TIG Welding Tips - Intro __________________ Gord May ~~_/)_~~ (Gord & Maggie - "Southbound") "If you didn't have time/$ to do it right in the first place, when will you get the time/$ to fix it?"

14-03-2009, 07:03	#6
bob kingsland Registered User Join Date: Dec 2007 Location: Boston Boat: 50' custom pilot house cutter Posts: 75	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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10-07-2008, 23:30	#2
cooper Registered User Join Date: Nov 2006 Posts: 969	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.

17-10-2008, 19:58	#3
Pauls Registered User Join Date: Oct 2008 Posts: 7	If you're stick welding, use 309L rod. It's made for welding stainless to steel. Regards, Paul

17-10-2008, 20:28	#4
usa-068 Registered User Join Date: Jun 2008 Location: Middletown, NJ. Boat: Bruce Roberts Offshore '38 - "God Willing" Posts: 37	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.