Micropore
Micropores are small, microscopically visible gas inclusions in the weld metal that reduce fatigue strength under load. They are caused by moisture or impurities.
Physical-Chemical Mechanism of Action
Micropores are small gas inclusions in the metal that form during the welding process. They can arise from moisture or chemical reactions and remain trapped in the material structure.
Metallurgical Relevance & Risks in Welding
Micropores impair the fatigue strength of the weld metal because they serve as stress concentrators. This can lead to earlier cracking and reduced service life. Furthermore, micropores can affect the material's behavior under dynamic loading by acting as sources of microplasticity.
Workshop Practice & Action Instructions
To minimize micropores, it is important to perform the welding process in a dry environment and thoroughly clean the joint faces. Use high-quality shielding gases and ensure proper cooling of the weld metal to prevent the growth of micropores.