Tungsten inclusion

Physicochemical Working Mechanism

Tungsten inclusions occur during TIG welding when the electrode melts or flakes off. These processes can introduce tungsten into the weld, where it acts as a density difference and stress raiser.

Metallurgical Relevance & Welding Risks

Tungsten inclusions lead to porosity and loss of strength. They can severely degrade the mechanical properties of the weld, leading to cracks or fracture.

Workshop Practice & Procedures

To minimize tungsten inclusions, use a clean electrode and ensure no tungsten residue remains on the weld surface. Proper use of deoxidizers and controlled post-weld heat treatment also help prevent tungsten inclusions.