| 摘要 |
PURPOSE:To prevent the generation of a crack by reheating of the periphery of a build-up layer having residual stress and to make the title welding in good quality by making the continuously moving speed in the length direction of the build-up laser beam moving back and forth in the width direction by oscillating in the length direction within the range of specified conditions. CONSTITUTION:A laser beam build-up welding is effected by continuously mov ing a base metal 4 in the length direction for the laser beam 20 moving back and forth in the width direction with oscillating by an oscillating mirror 17 and rocking mirror 21 on the build-up metal powder 2 located on the base metal 4. In that case, the relative continuously moving speed V(mm/min) in the length direction of an oscillating beam 20 is taken within the range of an inequality 1 for the mean speed v(mm/min) in the reciprocating movement in the width direction of the oscillating beam, the oscillating width a(mm) of the oscillating beam and a padding bead width T(mm). The periphery of the build-up layer is re-heated before the build-up part generating stress by being subjected to overlap S build-up being not cooled to prevent crack generation and to make the laser build-up in good quality. |
