工艺参数对旁轴送丝激光熔覆熔池行为的影响

Effect of Process Parameters on the Behavior of the Laser Cladding Weld Pool for Side-Axis Wire Feeding

利用旁轴送丝激光熔覆技术在不锈钢表面进行了单层单道熔覆实验,研究了扫描速度、送丝速度和激光功率对单道熔覆层成形质量的影响;并利用高速摄像机捕捉激光熔覆过程中熔池的动态演变,总结了工艺参数与优良熔覆层成形演变规律之间的关系。结果表明,焊丝向熔池过渡的方式主要取决于扫描速度和送丝速度的大小,可分为熔滴过渡和液桥过渡,其中液桥过渡所得到熔覆层的成形形貌更加优良。最佳熔覆层的工艺参数为:扫描速度18 mm/s、送丝速度300 cm/min、激光功率3400 W。

A single-layer laser cladding experiment is conducted on stainless steel surfaces using the side-axis wire feeding technique.The effects of scanning speed,wire feeding speed,and laser power on the formation quality of the single-layer cladding are investigated.Moreover,a high-speed camera is used to capture the dynamic evolution of the weld pool during the laser cladding process,enabling the analysis of the relationship between process parameters and the formation of highquality cladding.The results show that the mode of the weld wire transited into the weld pool mainly depends on the scanning speed and wire feeding speed,and it can be classified into droplet transition and liquid bridge transition.The liquid bridge transition leads to a superior formation of the cladding layer.The process parameters for achieving the highest quality cladding are found to be as follows:scanning speed of 18 mm/s,wire feeding speed of 300 cm/min,and laser power of 3400 W.