【摘要】 本文建立了运动电弧作用下三维TIG焊接熔池中的流体流动及传热过程的数学模型。该模型同时考虑熔池内部液态金属的对流、传导和熔池外部的固体导热,克服了雷卡林公式和纯导热数值解将焊接热过程当作纯粹固体热传导问题的局限性,扩展了电弧固定时的二维熔池传热模型。根据该模型得出的计算结果和实验测试结果吻合程度良好。更多还原

【Abstract】 It is of considerable practical interest to understand quantitively the heat and fluid flow phenomena in welding molten pools. The purpose of this paper is to develop a mathematical model to evaluate the three-dimensional fluid flow and temperature profile in a moving TIG welding molten pool. The model considers both the fluid convection-conduction heat flow in the pool and the conduction heat transfer in the surrounding solid material so that the limitations of the application of Rykalin’s formula and the numerical method of pure conduction could be avoided and the scope of the previous two-dimensional method for stationary arc extended. The theoretical predictions based on this model are found to be in good agreement with the experimental measurements.更多还原