Which risk increases significantly in steel structures if post-weld heat treatment is omitted after welding thick plates?

💡 Explanation

Omitting post-weld heat treatment in thick steel plates allows dissolved hydrogen to diffuse to the weld zone, where hydrogen-induced cracking occurs because of increased stress concentration and reduced ductility. Therefore hydrogen-induced cracking is the major risk, rather than grain growth, corrosion or reduced tensile strength that require different metallurgical conditions.

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