数值模拟是目前研究焊接行为最为有效的工具之一.结合焊接热过程的特点,介绍了大型通用商业软件PHOENICS在焊接热过程中的使用情况.PHOENICS包括三个模块化结构前处理、求解和后处理,可分别运行.以Gaussian热源的加载为例,介绍了其核心技术PHOENICS处理边界条件和源项的方法,为PHOENICS的进一步使用奠定了基础. Numerical simulation is one of the most effective tools for studying welding behavior at present.According to the characteristics of welding thermal process, this paper introduces the usage of PHOENICS, a large common commercial software, in the welding thermal process.PHOENICS consists of three modular pretreatment, Taking Gaussian heat source loading as an example, the paper introduces its core technology PHOENICS to deal with boundary conditions and source terms, which lays the foundation for the further use of PHOENICS.