薄板焊接变形中频感应矫正技术

目前针对船舶上层建筑中的薄板焊接变形矫正主要采用火焰矫正法,但此种方法效率低、操作安全性差,且难以实现自动化.为了更好地实现薄钢板焊接变形感应热矫正的自动化控制,提高矫正过程的精度,本文采用COMSOL Multiphysics仿真软件对尺寸参数为1 000 mm×600 mm×6 mm的薄钢板进行多物理场非线性耦合模拟,采用数值仿真分析方法分析了感应热矫正中温度场分布及应力变形规律,探究电参数对温度场及矫正效果的影响,同时进行了船用薄钢板中频感应矫正试验.结果表明:线圈电流频率及电流强度的增加可以有效提高薄板温升速率,改善热矫正效果.综合考虑操作安全性、感应电源负载等因素,制定了薄板焊接变形感应热矫正的电参数选择方案:当电流强度为110~120 A,电流频率为7 kHz时,可以得到较好的加热与矫正效果。

Intermediate frequency induction rectification technology for thin steel plate welding distortion

Currently, flame rectification is the predominant method to correct welding deformation of thin plates in ship superstructure, but it has the disadvantages of low-efficiency, poor operation safety, and difficult implementation of automation. In order to achieve the automatic control of welding induction thermal correction of thin steel plate and improve correction accuracy, this study used the simulation software COMSOL Multiphysics to conduct multi-physical-fields nonlinear coupling simulation of the thin steel plate with the dimension of 1000 mm×600 mm×6 mm, adopted the numerical simulation analysis method to analyze the temperature field distribution and stress deformation law in induction thermal correction, explored the influence of electric parameters on the temperature field and correction, and carried out the medium frequency induction correction test on marine thin plate. Results show that the increase of coil current frequency and current intensity could effectively increase the rate of temperature rise and improve the effect of thermal correction. After comprehensive consideration of operation safety, inductive power supply load, and other factors, an electrical parameter selection scheme for induction thermal correction of sheet welding deformation was developed, i.e., better heating and correction effects can be achieved with the current intensity of 110~120 A and the current frequency of 7 kHz.