基于SYSWELD的双椭球热源模型参数的确定

给出了应用SYSWELD软件的校正工具对双椭球热源形状参数和热输入进行确定的方法,提出了利用该法确定上述参数应遵循的两条原则.利用该法合理调整热源参数,较好地解决了采用Guass分布或双椭圆分布热源模式计算结果中尾部后拖不足的问题.结果表明,计算所得上表面和横截面熔池形状及熔合线走向与实测数据基本吻合,为运动电弧作用下的GTAW数值模拟与智能控制提供了理论依据和基础数据.文中分析了熔合线走向计算结果与试验结果误差较大的原因,为下一步工作指出方向.

Determination of shape parameters of double ellipsoid heat source model in numerical simulation based on SYSWELD software

Based on SYSWELD software, a method verified the parameters of heat source and heat input of double ellipsoid mode and two principles guiding how to determine the above parameters were put forward. Through taking the above mentioned measures, the trailing problem of molten pool rear in Guassian and double ellipsoid mode had been successfully solved. The experimental results show that the predicted shape and trend fusion line on top surface and cross section are in agreement with the experimental measurements. It provides theoretical basis and basic data for precise modeling and intelligent control of TIG welding process. The reason why so marked difference between the predicted and practical trend fusion line at the rear of the pool exists was analyzed, which could provide a guide for the future research.