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Investigation of the melting of overhang layers has been conducted under full temperature monitoring. Mechanisms of the melt penetration into loose powder bed have been determined. Temperature regimes of the selective laser melting process of the 3D object from steel 316L powder also have been investigated.

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A monitoring system is developed to visualize and to control the process of Selective Laser Melting (SLM) of metallic powder. The system is integrated with industrial PHENIX PM-100 machine. Visualization is carried out using LED illumination and CCD-camera; a home developed pyrometer is applied for monitoring of thermal phenomena in the zone of laser impact. Deviation of temperature from its optimal value is chosen as a criterion for the express method of quality control.

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