Metallic inclusion
Metallic inclusion are torn-off metal particles that become trapped in the weld metal. They cause local inhomogeneities and can lead to cracks or failures.
Physical-Chemical Mechanism of Action
Metallic inclusions form when metal particles get trapped in the molten pool during welding. These particles stay solid and can change the weld metal structure.
Metallurgical Relevance & Welding Risks
Metallic inclusions cause local inhomogeneities in the structure, which harms mechanical properties like strength and toughness. They can lead to cracks or failures in the weld, especially when they sit in stress fields.
Shop Practice & Action Items
To avoid metallic inclusions, make sure the weld metal quality and cleanliness are up to par. Use clean materials and pay attention to proper joint preparation. If you suspect inclusions, do a microscopic exam to find the cause and take steps to improve the process.