Chain-like micropores
Aligned micropores are tiny voids in weld metal that line up and act as notches under load. They encourage cracking.
Physical-Chemical Mechanism of Action
Aligned micropores are small voids in the material structure arranged in lines or chains. These pores can form due to incomplete melting processes or excessive stresses during cooling.
Metallurgical Relevance & Welding Risks
Aligned micropores act like notches and promote crack formation under dynamic loading. They can lead to hot cracks or cold cracks, especially when the material is under high stress. The number and size of the pores affect the mechanical strength and service life of the weld metal.
Workshop Practice & Action Guidelines
To minimize aligned micropores, it is important to ensure the weld pool is well shielded from oxidation and that the cooling process is controlled. Optimal stress relief during welding and careful cleaning of the workpiece can help reduce the number of pores. For special materials or high loads, it is advisable to perform an additional inspection step to ensure no aligned micropores form.