What is one of the main causes of hydrogen-induced cracking?

Hydrogen-induced cracking is a phenomenon that occurs when hydrogen infiltrates the weld metal or base metal during the welding process and the subsequent cooling stages. One of the primary contributors to this type of cracking is indeed high moisture levels in the weld area. Moisture can introduce hydrogen into the system in various ways, primarily from the presence of water or humidity in the air, which can react with the heat generated during welding.

When moisture is present in the weld area, it can be absorbed into the molten weld pool. As the weld cools and solidifies, if hydrogen is present, it can create significant internal pressures within the metal structure. This pressure can lead to the development of cracks, especially in high-strength steels that are more susceptible to hydrogen embrittlement.

Controlling moisture is essential during the welding process to minimize the risk of hydrogen-induced cracking. This may involve ensuring proper storage and handling of welding materials, including electrodes, and maintaining a suitable environment around the weld area.

In contrast, while factors like low temperatures during welding, the strength or condition of the base material, and electrode selection can influence overall weld quality and performance, they are not directly linked to the mechanism of hydrogen-induced cracking in the same manner as moisture levels. Thus,