【摘要】 采用DEFORM-3D软件模拟6082-T6铝合金FSW焊接过程中温度场及流场演变规律.结果表明:在搅拌针插入阶段,最高温度出现在搅拌针底端,随着搅拌针的继续插入,焊接过程中温度逐渐升高,工件上表面温度场呈圆状分布,而在厚度方向上呈盆状分布;当轴肩接触到被焊工件时,轴肩与工件之间的摩擦使工件温度急剧升高,达到了312℃,轴肩下压后温度进一步升高到470℃;搅拌头在插入位置停留5 s后,工件温度提升到502℃;搅拌头行走过程中温度及金属流动达到了一个准稳态,温度维持在500℃左右;黏塑性金属流速度矢量整体分布呈漏斗状,其方向大致与轴肩表面各点旋转方向切线平行,且温度场及金属流动规律随搅拌头行走距离的变化不明显.更多还原

【Abstract】 The evolution regularity of temperature field and flow field during FSW welding process of 6082-T6 aluminum alloy is simulated on platform of software DEFORM-3 D. The result shows that the highest temperature will appear at the bottom of the stirring pin during its insertion stage. With its insertion going on, the temperature of the weldment will increase gradually. The isotherm of its surface temperature field will assume a circular form and the temperature distribution within the weldment will assume a basin shape. When the pin shoulder touches to the workpiece, the friction between the shoulder and the workpiece will make the temperature of the workpiece rise sharply to 312 ℃ and will further increase to 470 ℃ after the shoulder is inserted down ward. After the pin staying for 5 s, the temperature of the workpiece will be raised to 502 ℃. During its traveling, the temperature and metal flow will reach a quasi-steady state and the temperature will maintain at around 500 ℃. The integral distribution of the velocity vector of the viscoplastic metal flow will assume a funnel shape, and its direction will roughly be parallel to the tangent of the rotation direction of each point on pin shoulder surface and the change of the temperature field and flow regularity of the metal with pin traveling distance will be not obvious.更多还原