Most weld failures don’t occur in the weld metal—they occur in the Heat Affected Zone (HAZ). Visit weldfabworld.com Follow Technical Master HAZ is the area of base metal that is not melted but undergoes metallurgical changes due to welding heat. Grain growth, increased hardness, and reduced toughness can make this zone critical. Proper control of heat input, correct welding parameters, and post-weld heat treatment are essential to maintain weld integrity. Understanding HAZ helps welders, enginee

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