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Degenerated Ladder Microstructure

An irregular formation of eutectic phases deviating from the lamellar ideal type, caused by local undercooling variations during solidification.

That's not a common technical term. If you mean structural changes in the weld area, you're talking about the heat-affected zone or overheating. It's about putting in too much heat or the cooling not being right. That can coarsen the structure and make the material brittle. Keep the heat input within limits and adjust the cooling to the material, then the structure stays clean.

MetallurgieSchweißtechnik

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