针对现有表面熔覆方法所采用的单一热源特性调控范围窄, 熔覆效率低, 稀释率大, 裂纹倾向明显, 成本高等问题, 提出采用一种大光斑半导体激光与TIG电弧复合热源可调控的表面熔覆方法。以Q235为母材, 在建立的热源可调控试验系统上, 进行大光斑半导体激光热源、大光斑半导体激光与TIG复合热源表面熔覆Co06粉末工艺试验, 分析了不同热源及参数对于熔覆层形貌、宏观尺寸、稀释率等成形特征的影响规律。结果表明, 相比大光斑半导体激光熔覆, 大光斑半导体激光与电弧复合表面熔覆方法, 可以显著降低所需激光功率, 在减小激光热冲击作用的同时降低生产成本。70 A＋500 W复合熔覆层表面和剖面形貌, 与1 300～1 500 W大光斑半导体单激光的熔覆效果基本相似, 高宽比减小35%, 稀释率减小27%。通过对复合热源特性的调控, 可有效提高生产效率, 为高性能的表面熔覆提供一种新方法。

The Existing single heat source methods of surface cladding have many disadvantages-difficulty regulating heat source characteristics, low deposition efficiency,high rate of dilution, easily induced cracks, high cost. Aiming at above issues , A hybrid heat source surface cladding method of large flare semiconductor laser and TIG arc is proposed. The heat source of the method can easily regulate. The Co06 alloy powder was deposited on Q235 steel plates by single large flare semiconductor laser heat source and the hybrid heat source method. Meanwhile, the effects of different heat source on morphology, macro-size, dilution ratio, etc. of cladding single-layer have been analyzed respectively .It was found that hybrid heat source method can significantly reduce the laser power, this method can reduce the thermal shock interaction via adding the arc heat to the laser heat source meanwhile reduce production costs. Using the same parameters, the results show that the morphology of cladding layer remained unchanged, the dilution rate of cladding layer decreased for about 27%, the height-width ratio of cladding layer decreased for about 35% with the hybrid heat source method. The hybrid heat source method can further improve the production efficiency and provide a new surface cladding method for high-end industrial.