考虑自由表面的活性TIG焊熔池温度场与流场的数值分析

发布时间：2018-04-25 11:07

本文选题：流体体积方法 + 活性TIG焊　；参考：《兰州理工大学学报》2015年06期

【摘要】：针对不锈钢定点活性TIG焊,采用焓-孔隙度法处理液-固相变化,采用流体体积(VOF)方法追踪熔池自由表面变形,考虑熔池所受电磁力、表面张力和电弧压力,建立三维非稳态熔池的数学模型.通过比较考虑和不考虑自由表面变形时熔池的温度场和流场,研究自由表面变形对活性TIG焊熔池中的传热和流体流动行为的影响.结果表明:当考虑熔池自由表面变形时,由于熔池中的对流现象减弱,使得最高温度增加,熔深变浅,熔宽增加,深宽比减小.考虑自由表面变形时熔池形貌更接近实际情况.
[Abstract]:In view of the fixed point active TIG welding of stainless steel, the change of liquid-solid phase was treated by enthalpy porosity method, and the free surface deformation of molten pool was tracked by the method of fluid volume. The electromagnetic force, surface tension and arc pressure were taken into account. The mathematical model of three dimensional unsteady molten pool is established. The effect of free surface deformation on the heat transfer and fluid flow behavior in active TIG welding pool was studied by comparing the temperature field and flow field of molten pool with and without considering free surface deformation. The results show that when the free surface deformation of the molten pool is considered, the maximum temperature increases, the penetration depth becomes shallow, the melting width increases and the aspect ratio decreases due to the decrease of convection in the molten pool. Considering the deformation of free surface, the shape of molten pool is closer to the actual situation.
【作者单位】：兰州理工大学材料科学与工程学院;唐山开元自动焊接装备有限公司焊接自动化技术研究所;
【基金】：国家自然科学基金(51265029)
【分类号】：TG444.74

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