【摘要】 为更贴近实际的模拟搅拌摩擦焊焊接过程中复杂的热力行为,试验通过建立三维搅拌摩擦焊过程数学模型,采用三维实体耦合的有限元方法来分析2219铝合金搅拌摩擦焊热过程和温度场分布.结果表明,搅拌摩擦焊焊缝的温度场梯度呈现上密下疏,前密后疏的分布状态,最高温度位于后退侧的搅拌针与轴肩的过渡区,焊缝后退边的温度高于前进边,搅拌针底部温度超过2219铝合金的再结晶温度,可确保对接接头根部形成紧密焊缝,模拟结果为研究搅拌摩擦焊的机理和优化搅拌摩擦焊焊接工艺提供了支持.更多还原

【Abstract】 To make the complicated process of heat and force of friction stir welding to be simulated more close to the actual state,we established the three-dimension mathematical model of stirring friction welding process, and analyzed thermal process and temperature field distribution of friction stir welding of 2219 aluminum alloy by means of the finite element method with 3D coupled model. Numerical simulation results show that,the temperature gradient of weld is different which the upper side is more compact than lower side and the advanced side is more compact than back side. The highest temperature is located at the transition zone of the back side between the stir-pin and the stir-head shoulder,the temperatures on the retreating side is higher than that on the advancing side,and it will be assured of tight weld if the temperatures of the area on the bottom of stir-pin are in excess of the recrystallization temperature of 2219 aluminum alloy when welding. At last,the result will provide a support for based research and technology optimization of friction stir welding.更多还原