2. Local or metallurgical weldability
2.1 Hydrogen embrittlement
2.1.1 Origins of the pressure effect
During welding, hydrogen can be introduced into the heat-affected zone (HAZ) as a result of the decomposition of high-temperature water vapor under the effect of the electric arc. This hydrogen, once trapped in the metal, can generate significant internal stresses through pressure, particularly during cooling, leading to local embrittlement of the welded joint.
The sources of this water vapor vary according to the welding
processes used (figure
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Local or metallurgical weldability
Global and constructive weldability
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