Hydrogen Diffusion Impact

Physical-Chemical Mechanism of Action

Hydrogen atoms dissolve as interstitial atoms and diffuse over time from low-stress to high-stress areas. This process is temperature-dependent: at higher temperatures, diffusion is faster.

Metallurgical Relevance & Risks in Welding

The accumulation of hydrogen atoms at stress concentrators can lead to hydrogen embrittlement and cracking. During welding at high temperatures, hydrogen can diffuse into the metal, later causing cold cracks.

Workshop Practice & Instructions

Avoid high temperatures during welding and control stress states in the component. For special materials like steels with high hydrogen content, post-weld dehydrogenation is required to prevent cracking.