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That all makes good senses Ed - Can also explain why the SS cladding on a blade looked like it was "printing thru" to the carbon steel core. Too much heat while welding allowing carbon migration to from core to cladding. On that blade I do remember pushing the heat a bit more than normal to be sure of sufficient heat to weld core (26C3) to the 410 SS cladding.
Something I've done in the past to get that bright line between cladding and core is to use a .005" layer of pure nickel. Welds good and sure makes a nice bright line.
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