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Heat affected zone

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Heat affected zone (HAZ) is the portion of a weldment that has not melted but has changed due to the heat of welding. The HAZ is between the weld deposit and the unaffected base metal. The physical makeup or mechanical properties of this zone are different after welding.[1]

References

  1. http://www.millerwelds.com/interests/instructors/pdf/Glossary.pdf
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