Q345R钢纵向磁场辅助K-TIG焊接接头组织和性能研究

Microstructure and property of K-TIG welded joints based on external longitudinal magnetic fields for Q345 steel

采用K-TIG焊接可实现中厚板不开坡口一道焊透,单面焊双面成形,焊接效率高、焊缝成形好。压力容器常用的Q345R钢传统焊接工艺需采用多层多道焊,效率较低、成本高。为拓展K-TIG焊接应用范围,将外加纵向磁场与K-TIG焊相结合,对Q345R钢焊接接头组织和性能进行研究。通过改变电磁场参数来探究磁场对焊缝成形、接头微观组织及力学性能的影响,为K-TIG焊接工艺的优化奠定理论基础。

Full penetration of mid-thickness metal with one pass welding can be obtained by K-TIG welding process.Single-sided welding and double-sided forming also can be performed,with high welding efficiency and good bead forming quality.Q345R steel is often used as pressure vessel metal,and has to be welded through multi-layer and multi-pass welding by a traditional welding process,which is low efficiency and high cost.In order to expand the application range of K-TIG welding,external longitudinal magnetic field is combined to K-TIG welding and the microstructure and mechanical properties of Q345R steel welded joints were studied.By changing the parameters of electromagnetic field,the influence of magnetic field on weld formation,joint microstructure and mechanical properties were studied.This study can lay a theoretical foundation for the optimization of K-TIG welding process.