| 摘要 |
PURPOSE:To apply laser beam build-up welding to a shaft, a pipe, etc., with low curvature by supplying fine particles for building up to this side of a weld zone of material to be welded and forming build-up metal of the fine particles for building up fed in the spot diameter of a laser beam. CONSTITUTION:The laser beam 15 emitted from a laser beam oscillator 10 is projected toward the weld zone of the material 2 to be welded to form a molten pool on the weld zone of the material 2 to be welded and simultaneously with this, the fine particles 17 for building up are supplied to this side of the weld zone of the material 2 to be welded to form said molten pool in the welding direction of the material 2 to be welded and the build-up metal 6 is formed on the weld zone of the material 2 to be welded. A part of the fine particles 17 for building up is then supplied to the inside of the spot diameter of the laser beam 15 and the remainder is supplied to cover above the formed build-up metal 6. By this method, satisfactory wear resistance with uniform hardness is maintained. In addition, build-up metal width is determined by the position out of focus and when this position out of focus is large, the build-up metal width becomes large and in addition, when the fine particle supply speed is low, the build-up metal height becomes low which can be applied to the shaft with low curvature. |
