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jdfoils said..
Rust at the welds on stainless is normally due to chromium depletion in the heat affected zone. Frequently the result of choosing a non-optimum filler rod.
Agree . Also I think in the spreader bar case , It`s looks like a piss poor welding job , just got it far to hot , and also probably the shielding gas was compromised . Just my observations from looking at porous holes in the welds , and also looking at the second brace ends where it appears the steel has almost been completely melted off !!
And with mast extensions , or any other part for that matter , carbon , stainless steel , ally , are really far apart on the galvanic scale . so you`ll get corrosiveness if those materials are in contact with each other .
But with the Severne bases pictures it shows the use of different type of materials from over the years .