How to compute heat affected area in weld

How to compute heat affected area in weld?

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Heat affected area is evaluated regarding the microstructure changes in weld. For instance in steels, this is the area around weld zone, that has undergone the transformation. In other words, this is the area that had been austenitized. For computing the HAZ after welding, for steels, it is enhanced to macroetech the section of weld HAZ can be simply recognized by the contrast it makes with base metal and weld metal.

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