METHOD OF LASER HARD-FACING Russian patent published in 2009 - IPC B23K26/34 C23C4/12 

FIELD: process engineering.

SUBSTANCE: proposed method comprises applying filler material onto surface to be processed and irradiating it by focused laser beam. Scanning comprises moving laser beam along circular trajectory. Note here that scanning diametre makes beam step makes and beam frequency of motion in melt bath makes

where d_l is the laser beam spot diametre, D is the laser beam rotation diametre, P is the laser radiation power, λ_m is main material heat conduction, T_m is the melting temperature of built-up material, °C, α is the factor equal to 1.0, when h<d_l, and equal to 3.0, when h>d_l, h is the laser step, γ is beam frequency of motion in melt bath, Hz, n is the number of laser steps at one melt point (n≥3), ν_n is hard-facing rate.

EFFECT: higher strength of built-up layer.

2 cl, 1 ex, 1 tbl