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为了探索焊接工艺对熔化极气体保护堆焊快速成形零件组织性能的影响,根据材料热物理性能参数以及相变潜热与温度的非线性关系,建立了熔化极气体保护堆焊成形过程的数学模型和有限元模型,利用ANSYS软件的APDL语言编写程序,实现了高斯移动热源载荷下的熔化极气体保护堆焊成形温度场计算,分析对比了不同焊接工艺对焊缝区温度场热循环的影响。结果表明:在其他因素一定的条件下,热输入和焊接速度对焊缝区热循环影响显著,而基板厚度对其影响较小;选择厚度约为16 mm的基板,采用小于120×20 J的热输入和大于10 mm/s的焊接速度有望成形出性能优良的零件。
In order to explore the influence of welding process on the microstructure and properties of the rapidly formed parts protected by welding gas, a mathematical model of the welding electrode forming process for the melting gas and gas was established according to the thermophysical properties of the material and the non-linear relationship between the latent heat and the temperature. Finite element model was established. The program was programmed by APDL language of ANSYS software. The calculation of the temperature field of the surfacing welding with molten gas and gas under the Gaussian mobile heat load was carried out. The influence of different welding processes on the thermal cycling in the weld zone was analyzed. The results show that under certain conditions, the heat input and welding speed have significant effects on the thermal cycling in the weld zone, while the thickness of the substrate has little effect on the thermal cycling. Thickness of the substrate is about 16 mm, Heat input and welding speeds greater than 10 mm / s are expected to produce high-performance parts.