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I found the following image in some fusion welding lecture slides, and I was curious if anyone knew how to explain the peculiar grain structure in a fusion welded joint. Specifically, I was wondering about how these columnar grains form in the fusion zone of a fusion welded joint and how the coarseness of the grains in the heat affected zones are proportional to the distance from the fusion zone.

Grain Formation in Fusion Welded Joint

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  • $\begingroup$ Think of how heat flows, and how temperature affects grain size. $\endgroup$ – Jon Custer Dec 13 '19 at 15:32

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