Which risk increases when welding high-strength steel columns under rapid cooling conditions?

💡 Explanation

When welding high-strength steel columns with rapid cooling, hydrogen diffusion decreases, trapping it, and hydrogen-induced cracking occurs because hydrogen atoms diffuse into the microstructure and cause internal pressure/embrittlement above a critical concentration. Therefore, hydrogen-induced cracking becomes much more probable, rather than lamellar tearing and other defects that require alternate stress conditions/high sulfur/phosphorous levels.

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