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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。70A+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。
Aiming at the problems of narrow control range, low cladding efficiency, large dilution rate, obvious crack tendency and high cost, the single-source heat source used in the existing surface cladding method is proposed to be controlled by a large spot semiconductor laser and a TIG arc heat source Surface cladding method. Based on the Q235 as the base material, Co06 powder was tested on the surface of the large spot laser diode laser source, large spot laser diode and TIG composite heat source. The effects of different heat sources and parameters on the cladding layer Appearance, macro size, dilution rate and other forming characteristics of the law. The results show that compared with large spot laser cladding and large spot laser and arc cladding, the required laser power can be significantly reduced, reducing the laser thermal shock and reducing the production cost. The surface and cross-sectional morphology of 70A + 500 W cladding cladding are similar to those of 1 300-1 500 W single-beam laser cladding. The aspect ratio is reduced by 35% and the dilution rate is reduced by 27%. By controlling the characteristics of the compound heat source, the production efficiency can be effectively increased and a new method for high-performance surface cladding can be provided.