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为了研究T型接头激光深熔焊热现象,基于激光深熔焊能量分布特点,类比T型接头焊缝几何形貌,抽象出热源模型特征参数,间接考虑小孔效应,建立了新型体积分布式热源模型。应用这一热源模型对T型接头激光深熔焊温度场进行了数值模拟,得到了T型接头激光深熔焊温度场并在三组参数下进行了实验验证,与常用热源进行了比较。结果表明,传统体热源模型不能准确模拟T接头激光深熔焊加工过程,而新型热源模型所得焊缝横截面熔合线轮廓与试验所得T型接头焊缝熔合线吻合良好。新建模型及建模方法对T型接头激光深熔焊热力耦合分析具有一定的指导意义。
In order to study the laser deep penetration welding heat phenomenon of T-joints, based on the energy distribution characteristic of laser deep-penetration welding, the geometric characteristics of weld T joints were simulated, the characteristic parameters of heat source model were abstracted, and the pinhole effect was considered indirectly. Heat source model. Applying this heat source model, the temperature field of T - type laser deep penetration welding was numerically simulated. The temperature field of T - type laser deep penetration welding was obtained and verified with three groups of parameters. The results were compared with those of conventional heat sources. The results show that the traditional body heat source model can not accurately simulate the T-joint laser deep-penetration welding process, while the new fusion heat-source model has good agreement with the T-joint weld fusion line. The new model and the modeling method are of guiding significance to the thermal coupling analysis of T-type laser deep penetration welding.