Cluster of porosity

Physicochemical Mechanism of Action

Cluster porosity occurs when several small pores or inclusions consolidate in a small area. These can be caused by insufficient deoxidation, welding processes, or mechanical stresses.

Metallurgical Relevance & Risks in Welding

Excessive cluster porosity can lead to significant weakening of the material. The material becomes less tough and is susceptible to cracking or corrosion. This can be a serious hazard, especially in stress zones.

Workshop Practice & Instructions

To avoid cluster porosity, it is crucial to perform the deoxidation steps carefully and ensure that no mechanical stresses occur during the welding process. In severe cases, post-treatment or reweld may be necessary.