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为了减少熔覆开裂,提高熔覆质量,本文采用一定光束间距的并联双光束激光对铸铁表面进行熔覆,建立熔覆过程三维热力耦合模型,分析双光束激光熔覆热/力特征变化。计算结果表明,双光束激光在提高熔覆效率的同时,相邻两熔道彼此进行预热与缓冷,减小了激光熔覆过程中急剧升温与冷却产生的巨大温度梯度,降低熔层和结合区的残余应力水平,进而达到抑制裂纹产生的效果。1 800W-1 400W功率组合、光束间距为12.5mm是较为理想的参数组合。
In order to reduce the cracking of the cladding and improve the quality of the cladding, a parallel dual-beam laser with a certain beam spacing was used to coat the surface of the cast iron. A three-dimensional thermal coupling model of the cladding process was established to analyze the thermal / thermal characteristics of the dual-beam laser cladding. The calculation results show that the dual-beam laser can improve the cladding efficiency while the two adjacent melt channels are preheated and cooled to each other, which can reduce the huge temperature gradient caused by rapid heating and cooling during laser cladding, Combined with the residual stress level, and then to achieve the effect of inhibiting cracks. 1 800W-1 400W power combination, the beam spacing of 12.5mm is the ideal combination of parameters.