Which risk increases when welding high tensile steel without preheating during bridge construction?

💡 Explanation

When high tensile steel is welded without preheating, rapid cooling can occur encouraging hydrogen diffusion into the weld metal and heat-affected zone, leading to hydrogen-induced cracking. Therefore hydrogen-induced cracking is more probable, rather than changes in yield strength, arc blow, or inclusions which arise due to separate metallurgical phenomena.

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