不同堆焊工艺参数下薄壁圆筒端部变形量的数值模拟

Numerical Simulation of Deformation of Thin-wall Cylinder End under Different Surfacing Parameters

为解决大直径薄壁圆筒内壁堆焊不锈钢后端部变形量大、后续装配难的问题,应用Mark有限元软件模拟了焊接工艺参数对焊接温度场和焊接变形的影响,比较了不同焊接顺序、焊接速度、圆筒端部预留宽度、堆焊层数条件下焊后圆筒端部的变形量。结果表明：每层均由圆筒的边缘向其内部堆焊时,焊后圆筒端部的变形量最小。焊接速度越快,焊后圆筒端部变形量越小,但焊接速度为21.360 mm/s时,焊后变形发生异常,不能实现正常焊接。在0~83.334 mm范围内,随着圆筒端部预留宽度的增加,圆筒端部变形量减小。堆焊层数在1~4层内,随着堆焊层数的增加,圆筒变形量增大。

In order to solve the problem that the deformation is large and subsequent assembly is difficult after surfacing the stainless steel on the inner wall of large-diameter thin-walled Cylinder, the influence of welding process parameters on the welding temperature field and welding deformation was simulated by using Mark fininite element sottware, and the deformations of the cylinder end after surfacing under diffement sequences, welding speeds, allowance widths of cylinder end and sufacing layers were compared. The results show that when each layer is welded from the edge to the inside of the cylinder, the deformation of the end of the cylinder is minimal. The faster the welding speed is, the smaller the deformation of the end of the cylinder after welding is. However, when the welding speed is 21.360 mm/s, abnormal deformation after welding occurs and it can＇t realize normal welding. With the increase of the allowance width of the cylinder end in the range of 0-83.334 mm, the deformation after Welding decreases. With the increase of surfacing layer in the range of 1 -4, the deformation of the cylinder increases.