Sintering Bridge Formation
Sinter bridge formation is the thermally induced bonding of powder particles outside the laser track due to stray radiation or heat conduction. This makes depowdering of complex internal channels difficult.
Physicochemical Mechanism of Action
Sinter bridging occurs when powder particles near the laser melting process are thermally activated by stray radiation or heat conduction. These particles sinter together and form bridges between the main powders, altering the structure of complex internal channels.
Metallurgical Relevance & Risks in Welding
Sinter bridging can lead to blocked or closed channels, making it difficult for fluids or gases to pass through. This impairs the quality and functionality of the manufactured part, e.g., in the production of combustion engines or electric drives.
Workshop Practice & Instructions
To avoid sinter bridging, it is important to precisely set the laser melting parameters (laser power, scan speed). An optimal gas flow and careful powder removal from the machined surfaces also help reduce the occurrence of sinter bridges.