热丝激光熔覆技术在垃圾处理行业的应用

Hot-wire laser cladding in waste-to-power industry

在膜式壁受热面堆焊一层薄且均匀的Inconel 625镍基合金耐高温腐蚀表面改性层,经证明是一种能有效延长垃圾焚烧炉使用寿命、性价比最高、可行且可靠的解决方案。传统的膜式壁电弧堆焊技术存在堆焊层稀释率高、熔覆效率低、工件需竖立施焊等弊端。热丝激光熔覆技术采用大功率、能量平顶分布的特殊波长半导体激光器,配合35 kHz超高频脉冲低压热丝电源,利用龙门式焊车,在水平放置的膜式壁曲面上大面积堆焊Inconel 625镍基合金,可得到稀释率5%以下、熔覆效率达到8.8 kg/h的优质堆焊层。在提高堆焊层品质的同时,可显著提高生产效率,简化工件安装程序,降低用工成本,避免安全隐患。

Cladding a thin and uniform layer of Inconel625 nickel-based alloy onto the heat-exchanger panels for high-temperature corrosion resistance purpose could effectively extend the service life of a refuse incinerator,and is proved to be a feasible and reliable solution with the best cost perfor-mance ratio. Conventional arc cladding technology could do this surface modification job but it has some disadvantages such as high substrate dilution,low deposition efficiency and the workpieces should be welded vertically. In this paper,a hot-wire laser cladding system is described,witch adopts a high power diode laser generator with a specific wavelength and homogeneous energy density and a 35 kHz ultrahigh frequency pulsed low voltage hot-wire laser power supply,and successfully clads the Inconel 625 onto a wall surface placed horizontally by gantry type welding tractor. The experiment shows that the dilution rate of the cladding layer is less than5%,while the efficiency of cladding is about 8.8 kg/h. This innovative system can significantly improve the quality of the cladding layer and the productivity,simplify workpiece installation procedures,reduce labor costs and avoid potential safety hazards.