变壁厚铜锌合金管激光熔覆应力场数值模拟分析

Numerical Simulation Analysis of Laser Cladding Stress Field of Copper-Zinc Alloy Tube with Variable Wall Thickness

采用预热的方法增大铜锌合金激光吸收率,利用ANSYS软件分别对铜锌合金的薄壁和厚壁进行熔覆过程模拟,以温度场分析求得的结果作为物理载荷进而求解应力场。利用建立的模型,分析预热和温度变化对应力场的影响。结果表明:先熔覆两端薄壁处,最后熔覆中部厚壁部位,在薄壁进行激光熔覆时出现了较大应力集中,不宜进行多道连续熔覆实验;在厚壁进行熔覆时虽然也出现了较大的应力集中,但是由于壁厚可以进行多道熔覆,熔覆效果较好,表面无裂纹和气孔,形成了良好的冶金结合。

The preheating method is used to increase the laser absorption rate of the copper-zinc alloy,and the thin-wall and thick-wall copper-zinc alloy are respectively simulated by the cladding process using ANSYS software,and the result obtained by analyzing the temperature field is used as the physical load to solve the stress field.Use the established model to analyze the influence of preheating and temperature changes on the stress field.The results show that the thin-walled parts at both ends are first cladding,and the thick-walled part in the middle is cladding finally.When the thin-wall is laser cladding,there is a large stress concentration,and it is not suitable to conduct multiple continuous cladding experiments.Although there is a large stress concentration during thick wall cladding,multiple cladding can be carried out due to the thickness of the wall,the cladding effect is better,there are no cracks and pores on the surface,and a good metallurgical bond is formed.