串热源模型及其在焊接数值模拟中的应用

通过分析焊接热源的特征要素 ,在高斯热源的基础上 ,根据输入热功率相当提出段热源模型 ,并与点热源结合 ,进一步提出更加灵活实用的串热源模型。经验证明 ,可在保持精度的同时大幅度地缩短计算时间 ,从而使实际构件工艺的模拟、优化成为可行。还利用该模型进行桥式起重机腹板切割工艺的模拟 ,得到与测量曲线很吻合的结果

MODEL OF STRING HEAT SOURCE IN WELDING NUMERICAL SIMULATIONS

In view of the characteristics of welding heat source,a new model named string heat source is established to improve calculation efficiency.First the line Gauss heat source is derived from Gauss model,then the string model comes after it.In all these deductions,the same heat input powers are kept.The string model is more flexible and convenient than line Gauss one.Typical welding processes are simulated by using all these models.The results show that by using the new model analysis time can be reduced greatly while high precision is still kept,and this method makes 3 D simulation of some products with long welding practical.With line Gauss source and string source the cutting process of side plate of bridge crane beam is simulated,and the results fairly coincide with real measurement.