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Keeps saying pics too big. I have resized them down to under 2mb.
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As far as I am aware weathering steel simply rusts at a much more rapid rate to create a protective "crust" similar to oxidation on non ferrous metals? Think it will weld fine, found this on lincoln electric site
"Core Ten (A242 & A588) steels are weathering steels commonly used for outdoor structures. These steels have a higher resistance to atmospheric corrosion than typical mild steels. Often, welds on these steels are specified for similar corrosion resistance and color match.
On single pass welds, mild steel electrodes are commonly used. There is usually enough pickup from the base metal to obtain a good color match.
On multiple pass welds, low-alloy electrodes are commonly used to obtain a good color match and similar corrosion resistance. The electrodes commonly specified include those with the suffixes -C1, -C2, and -C3."
Also from the forum
https://www.mig-welding.co.uk/corten.htm