Incoherent Precipitates
Incoherent precipitates are metal particles in the weld that have no lattice geometric pattern to the host lattice. They lead to poorer mechanical properties and increase the risk of cracking.
Physicochemical Mechanism of Action
Incoherent precipitates form when metal particles are not fully integrated during the welding process. They retain their own crystal structure and phase boundaries and have no lattice geometric continuity with the host lattice.
Metallurgical Relevance & Risks in Welding
These precipitates can lead to increased stress uptake, as they are mechanically uneven. They cause cracks and sheet-metal-like deformations in the weld, which impairs the strength and toughness of the overall system.
Workshop Practice & Action Guidelines
To minimize incoherent precipitates, it is important to carry out clean weld pool management. Avoid excessively high precipitation rates and standing metal particles in the weld pool. For heavy precipitates, the weld can be improved by cleaning or replacing the weld pool.