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Stainless acts a little different than regular carbon steel. It is harder. To weld it you need to use 309. If you are using wire be sure to run tri-gas or sunarc gas with that. That is a helium, argon, CO2 mix. If you use just regular 70K mild wire, it won't bond correctly and will crack with pressure. I am actually currently working on some of the stainless parts on my sub also. Hope this helps, Scott Waters > To: personal_submersibles@psubs.org > From: james@guernseysubmarine.com > Subject: [PSUBS-MAILIST] Stainless Welding Question > Date: Wed, 24 Feb 2010 11:43:54 +0000 > > Hi All, > > Finally i am getting on with my sub again and am ready to install all the through hulls into the hull. > > The plans call for welding all the stainless parts in with stainless wire. 309L if i remember correctly. > > Speaking to some very experienced welders here, they tell me to weld the parts in using ordinary wire. One of the guys is a shipbuilder and he says they weld all the ship I/O spigots using ordinary mild steel wire as it is less likely to crack. > > As long as its 70,000psi wire, does it really matter? Of course there is the corrosion issue, but the parts will be painted anyway along with the rest of the hull. > > I suspect the answer to this will be to use stainless wire but i would like to know why its needed. > > Any ideas? > Many thanks > James > Hotmail: Trusted email with Microsoft’s powerful SPAM protection. Sign up now. |