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The subject of this research is to develop a technique for refurbishing worn machine parts by applying a new material to the eroded surfaces with the aim not only of replacing the worn out material but of obtaining surface layers with better service characteristics than those of the original part. Among possible ways of applying additional material to the eroded surfaces, cladding and surface alloying can be named. An infrared continuous C02 laser with a maximum power of 8 kW was used in the investigation. The laser was equipped with an optical system and a computerized table that allows rotation of the specimen as well as its movement in three directions with a wide range of travel velocities. A direct injection of an alloying powder in the laser beam melted zone at the specimen surface was explored as a way of surface cladding. The powder used for this purpose was a cobalt-base alloy, "Stellite". The thickness and composition of the cladded layers vary significantly with irradiation conditions. A low content of iron (1%) in a cladded layer indicates that a significant amount of Stellite powder can be homogeneously introduced.

Laser Cladding and Alloying for Refrubishing Worn Machine Parts