摘要
为评价中厚板低合金钢焊接接头的力学性能,文中对10 mm厚的Q345B钢对接试板进行激光MAG复合焊接,焊后对合格的焊接接头进行微观组织分析及力学性能测试(拉伸、弯曲、常温冲击测试)。结果表明,优化后的激光MAG复合焊接工艺可以得到成形良好的焊接接头,焊缝组织主要为柱状先共析铁素体及针状珠光体。由于激光和电弧的共同作用使得焊缝上部热输入比焊缝下部大,焊缝上部组织显得粗大分散而焊缝下部组织较为细小致密。焊接接头抗拉强度为479 MPa,断后伸长率为23.5%,弯曲角180°时弯曲试样未出现裂纹,常温冲击吸收功为56.53 J。
In order to evaluate the mechanical properties of Q345 B middle thickness steel plate welded joint, a laser-MAG hybrid welding process was used to weld 10 mm thick test plate. Metallographic analysis and mechanical performance tests were performed on each area of the welded joint, including tensile, bending and impact test at room temperature. The results showed that the welded joint obtained by the welding process was well formed, and the laser-MAG welding seam was columnar pre-eutectoid ferrite and needle pearlite. Due to the combined action of laser and arc, the heat input at the upper part of the weld was greater than that at the lower part of the weld, and the upper part of the weld was coarser and dispersed. The average tensile strength of the joint was 479 MPa, and the average elongation after breaking was 23.5%. The bending specimen did not show crack at a bending angle of 180°. The impact energy at room temperature was 56.53 J.
作者
吴虎
WU Hu(CRRC NANJING PUZHEN Co.,Ltd.,Nanjing 210031,Jiangsu pro.,China)
出处
《焊接技术》
2020年第9期10-12,I0007,共4页
Welding Technology
关键词
复合焊
中厚板
焊接工艺
hybrid welding
middle thickness plate
welding technology
