Studies on the direction-independent temperature measurement of a coaxial laser metal deposition process with wire

Among the Directed Energy Deposition (DED) processes, Laser Metal Deposition with wire (LMD-w) combines the advantages of a high precision and a high deposition rate. Recently, optical systems have been developed that form a ringshaped laser spot, facilitating a direction-independent LMD-w process. When a pyrometer is coupled to such an optical system, the measurement spot features a ring-shaped form corresponding to the laser spot. Using this pyrometer setup, the inline temperature signal during the LMD-w process was studied within this work. The two modalities of a one-color and a two-color measurement were compared regarding their reliability. The measurement setup was varied to study the influence of different process conditions on the signal. Based on this, a configuration was identified that allowed a valid measurement. A reliable inline temperature measurement opens the opportunity to monitor and control the process.     «

Among the Directed Energy Deposition (DED) processes, Laser Metal Deposition with wire (LMD-w) combines the advantages of a high precision and a high deposition rate. Recently, optical systems have been developed that form a ringshaped laser spot, facilitating a direction-independent LMD-w process. When a pyrometer is coupled to such an optical system, the measurement spot features a ring-shaped form corresponding to the laser spot. Using this pyrometer setup, the inline temperature signal durin...     »