Hydrogen-induced cracking

Physicochemical Mechanism of Action

Interstitially dissolved hydrogen takes positions between atomic nuclei, altering the crystal structure. This impairs material strength and makes it more brittle.

Metallurgical Relevance & Welding Risks

Hydrogen-induced cracking can lead to hot cracks and cold cracks, especially at high temperatures and under mechanical stress. The material becomes softer and loses toughness.

Workshop Practice & Action Guidelines

Avoid high hydrogen loads by using correct welding parameters (temperature, time). Use deoxidizing agents like silicon or titanium. Check the material for hydrogen content before and after welding.