316LN超导磁体支撑焊接变形及制造工艺

Welding deformation and manufacturing technology of 316LN irregular supports

为对聚变堆低温超导磁体支撑的焊接变形进行控制和研究。文中首先对3 mm控氮不锈钢薄板进行了TIG焊对接焊试验和焊接变形的热弹塑性有限元分析。结果表明,焊接温度场的计算结果与实测值的偏差小于20%。在此基础上,对变形严重超差的异形支撑结构的焊接变形和残余应力进行研究。研究发现,夹具释放后近缝区的残余应力再平衡是导致该构件尺寸超差的主要原因,分析所得的焊接变形趋势和数值均与实测值吻合。因此可得,热弹塑性有限元法能够运用于大型316LN不锈钢复杂部件焊接变形的实际生产。

In order to control and study the welding deformation of the low temperature superconducting magnet supported by fusion reactor.In this paper,the thermal elastic plastic finite element analysis of 3 mm 316LN for TIG butt welding test and welding deformation measurement were carried out.The results indicated that the deviation of the welding temperature field from the measured values was less than 20%.Based on this,the welding deformation and residual stress of the deformed support structure were studied.It was found that the residual stress rebalance after the release of the jigs was the main reason for the large deformation.Therefore,it was shown that thermal elastic plastic finite element analysis could be used to predict welding deformation of 316LN complex components.