In the construction of a high-rise building with steel frame, which consequence results from improper preheating before welding thick load-bearing columns?

💡 Explanation

Hydrogen-induced cold cracking emerges when preheating is insufficient because rapid cooling traps hydrogen within the weld, embrittling the metal due to hydrogen diffusion and subsequent crack formation; therefore, hydrogen-induced cracking is the failure, rather than improved weld properties under proper preheating levels.

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