Distribution type laser spot alloying method

A laser dot distributed alloying process, the present invention relates to a laser surface alloy strengthening techniques. The method using high power density laser aperture effect occurring in the metal surface, the coated surface of the molten bath to form a mixed metal group added or powder feeder by high performance alloy powder and the metal matrix formed by the following rapid solidification point of the alloy comprising alloying zone and the solid phase change portion including two regions, a control point by point laser beam machining, thereby forming a series of geometric distribution having a certain alloying point on the surface of high aspect ratio material to achieve large distributed strengthening the area of ​​depth. The present invention reduces the stress accumulated scan overlap, the overlapping zone temper softening overcome the problem of crack blocking the path, optimization of the distribution points and the alloying Form Design improve the wear resistance of the surface, the alloy point of the base body together form white fatigue tough, wear-resistant surface, can greatly improve the life of the workpiece.