基于电磁力随焊控制残余应力和变形的可行性分析

Feasibility of controlling welding residual stress and distortion with tailing electromagnetic force

关键词:  电磁力  残余应力  随焊  变形

Key words:  electromagnetic force  residual stress  trailing  distortion

摘要:

提出了基于脉冲电磁力随焊控制焊接应力及变形新方法。针对平面螺旋线圈,采用ANSYS软件论证了该方法的可行性。该方法的基本思想是将电磁线圈置于焊件上方,并在焊接过程中使其始终处于靠近焊枪的合适位置。将线圈通入较大的脉冲电流,产生变化磁场,使焊件感生涡流,线圈和焊件之间产生电磁力的作用。依靠电磁力对热态焊缝及近缝区金属的延展作用控制残余应力及变形。结果表明,平面螺旋线圈轴向电磁力的方向垂直板面向下,能够延展高温金属。基于电磁力随焊控制焊接残余应力和变形是可行的。

Abstract:

New idea to control welding residual stress and distortion with trailing impactive electromagnetic force was given.Its feasibility was discussed by simulaion with the finite element analysis software ANSYS in the case of using flat spiral coil.The idea is the following:the inductor is located near the welding torch over the weldment and moved with the welding torch during welding.There is the rapidly changing current with high peak value in the inductor. And then there is the changing magnetic flux and the erratic current in the weldment.The electromagnetic force is gene rated between the inductor and the weldment.The welding residual stress and distortion will be controlled if the high temperature weld and the metal near the weld can be extended by the electromagnetic force.The simulation results show that the weldment is repelled by the coil owing to the axial electromagnetic force of flat spiral coil.And high temperature metal is able to be extended by electromagnetic force.Therefore, the welding residual stress and strain could be controlled based on electromagnetic force.