挤压法矫正薄壁焊接圆筒圆度的有限元模拟

提出通过挤压焊缝区金属来矫正薄壁焊接圆筒圆度的方法.借助有限元软件对该方法的矫圆效果进行了模拟,并对其矫正薄壁焊接圆筒圆度的机理进行了分析.模拟结果显示,具有纵缝的薄壁焊接圆筒径向呈“桃形”,尤其两个端部最为显著,经矫圆后,焊接圆筒的不圆度显著改善.利用自制的装置对挤压法矫圆的效果进行了验证.结果表明,对于外径为280 mm、长度为300 mm的2mm壁厚不锈钢焊接圆筒,通过挤压焊缝区金属能够将其端部圆度控制在0.5mm左右.

Finite element simulation of rectifying roundness of welded thin-walled cylinder by extrusion

The method of rectifying the roundness of welded thin-walled cylinders was proposed by extruding the metal in and around the weld. The effect of roundness rectification by extrusion and the mechanism in which the effect lies were investigated by finite element method (FEM). The cylinder welded longitudinally has a peach shape in radial direction and significantly distorts at two ends. The simulation results show that the extrusion method can effectively improve the roundness of the welded cylinder. The effectiveness of rectifying the roundness of welded thin-walled cylinders by extrusion was verified with self-made devices. The experimental results show that the roundness at the ends of welded stainless steel cylinders with 2 mm in wall thickness, 300 mm in length and 280 mm in external diameter can be reduced to about 0.5 mm by extruding the metal in and around the weld.