焊接工艺对GMAW堆焊焊缝区温度场影响的数值模拟

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16mm的基板，采用小于120×20J的热输入和大于10mm／s的焊接速度有望成形出性能优良的零件。

Numerical Simulation of the Effects of Welding Processes on Temperature Field of GMAW Surfacing Weld Zone

In order to study the effects of welding processes on the structure and property of parts made by Gas Metal Arc Welding （GMAW） surfacing Rapid Forming （RF） technology, based on the nonlinear relations between the thermophysical performance parameters and phase change latent heat with temperature, the mathematical model and finite element model of GMAW surfacing formation are established. Based on ANSYS APDL developing platform, the temperature field of surfacing deposition formation loaded by Gauss thermal resource is calculated by ANSYS. The effects of welding process on temperature field are atso analyzed. The results indicate that heat input and welding speed greatly influence the thermal cycles of weld zone, while the thickness of plate does little under other welding process parameters defined. On low carbon steel within 16 mm thickness, the excellent RF parts will be obtained by adopting heat input of less than 120 ×20 J and high welding speed of more than 10 mm/s.