钢管径向摩擦搭接焊加载力数值模拟

采用ABAQUS软件,以45钢为径向环,对钢管径向摩擦焊在假设变形速率前提下分析焊接界面温度场和径向环的加载力情况.计算采用了Johnson-cook幂硬化弹塑性模型,并考虑材料热物性与摩擦系数随温度变化.结果表明,在不考虑径向环与夹具之间传热的前提下,在焊接界面形成了以夹具体为中心的椭圆状温度梯度分布和以夹具体空隙为中心的条带状温度梯度分布,两处的最高温度达到1 260℃和1 050℃的前提下得到了加载力曲线.为了简化焊接工艺过程将加载力曲线人为拟合为定值三段加压过程,重新代入模型反复修正计算使界面温度场和径向环变形过程与焊接过程吻合良好.

Loading pressure numerical analysis on radial friction lap welding joint of steel pipe

Based on explicit analysis,a 3D FE model coupled with thermo-mechanical of radial friction lap welding joint was established with 45 steel by applying ABAQUS software.Assuming that the deformation rate is known,it is discussed the field of temperature on the welding interface and the loading force on the radial ring in the paper.Using the Johnson-cook constitutive model,thermal properties,friction coefficient changing with temperature and plastic deformation heat were also considered,The temperature field distribution and the deviation of loading pressure were predicted and analyzed.The results show that without considering the heat transfer of the radial ring and the fixture,the radial ring is formed to fixture as the center to form an elliptical temperature gradient distribution and to fixture void as the center to form an strip temperature gradient distribution.The maximum temperature reached 1 260 ℃ and 1 050 ℃.In order to simplify the welding process,the loading force curve fit for three compression process.The explicit analysis,the standards and the constitutive model were feasible.