Even if the welds are made with the proper welding wire stock, the issue of corrosion at the welds still exists. Also, the suggestion of replacing the steel with PVC does very little good for the OP who is replacing CHAINPLATES, which are very high load items. PVC is not very strong.
Not always is stainless welded with the exact same material as the base metal. Close to the same material is not good enough. Polishing the welds can deter external corrosion but not internal and as we know some steel boats rust from the inside out. Aluminum and stainless steel fuel, water and holding tanks rust and corrode from the inside out. Most commonly this rust and corrosion appears at the welded joints and especially where these tanks come in contact with foam insulation or rest on their mounts. In your customer's situation I would consider not just these conditions but also the dissimilar metals and especially if they are in contact with the galvanized mild steel framework. On my water maker I replaced every item I could with PVC, even making the filter chambers from 4" PVC pipe with end caps and reducers thus eliminating 99% of the corrosion problems with no adverse effects to the system.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.