【摘要】 利用环形光斑复合镜对千瓦级横流ＣＯ_２激光器光束进行变换，使光束由圆形变换为环形，用该光束对发动机曲轴常用材料──球墨铸铁进行了镍基合金激光熔敷，阐明了激光熔敷工艺、熔敷层组织结构及硬度特点，并在废弃曲轴上进行了初步试验。更多还原

【Abstract】 in this paper,the round beam of kw-grade laser was changed to a doughnut spot by doughnut-shaped complex lens, Using this Kind of beam,laser cladding of Ni -based alloy on ductile iron surface for use as engine crankshaft is made. The laser cladding technology,structure of cladding zone and the hardness characteristic are expounded.更多还原