Which mechanism causes localized corrosion in stainless steel near weld joints, leading to material weakening?

💡 Explanation

Hydrogen embrittlement occurs when atomic hydrogen diffuses into austenite because the welding thermal cycle decomposes moisture near the joint, releasing hydrogen atoms. These accumulate at grain boundaries, causing cracking. Therefore, embrittlement, rather than galvanic or crevice effects, weakens the steel.

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