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为解决激光熔覆成形不等宽构件多道搭接产生的冷却不均匀、产生开裂等缺陷问题,提高激光熔覆成形不等宽熔道的成形效率及成形质量。基于光内送粉方式在单道工艺中采用实时变激光光斑方法,一次扫描而非多道搭接直接熔覆出不等宽熔道。实验结果表明:在保证送粉量足够条件下,变光斑过程中通过实时变扫描速度,能够直接熔覆出高度增长一致,宽度逐渐变化熔覆层;随熔道宽度逐渐变宽过程中,熔覆层显微组织树枝晶大小逐渐变细。为光内送粉激光熔覆成形薄壁变壁厚类零件的工艺提供指导。
In order to solve the uneven cooling caused by lap lapping of unequal-width components formed by laser cladding, defects such as cracking are caused, and the forming efficiency and the forming quality of the lamellar with laser cladding are unequal. Based on the light powder feeding method, a real-time variable laser spot method is used in a single pass process, and one scan instead of multiple pass straps directly doubles the unequal-width melt. The experimental results show that under the condition of sufficient powder feeding, the cladding layer with the same height and the same width can be directly cladded by real-time variable scanning speed during the spot changing process. During the process of widening the width of the melt, Cladding microstructure Dendritic size tapering. It provides guidance for the process of powder coating laser cladding forming thin-wall variable wall thickness parts.