Hydrogen diffusion in the crystal lattice
Hydrogen atoms move quickly through the crystal lattice of metals. They gather in stress areas and cause failure.
Physical-Chemical Mechanism of Action
Hydrogen diffusion is the process where hydrogen atoms move quickly through the interstitial lattice of metals. This mobility allows the atoms to reach areas where mechanical stresses are high.
Metallurgical Relevance & Risks in Welding
The accumulation of hydrogen can lead to the formation of hydrides that soften the material and impair its mechanical properties. This increases the susceptibility to cracking and failure under mechanical load.
Workshop Practice & Instructions
To minimize hydrogen diffusion, it is important to carefully select welding materials. Use metals with low hydrogen uptake and pay attention to correct welding parameters like temperature and time. For special applications, additional measures such as dehydrogenation processes may be required.