运用15kWCO2激光焊机在不同的焊接参数下对无取向低碳低硅电工钢进行了激光填丝焊焊接试验,并对试样进行了拉伸试验、显微硬度测试及焊缝显微组织观察,得到了在不同线能量焊接条件下焊缝组织及性能的变化规律.结果表明：其显微组织随着焊接线能量的减少,从粗大的多边形铁素体变为针状铁素体和粒状贝氏体,进而出现方向性明显的M-A组元;同时母材中的硅使得此电工钢熔透性较低碳钢差,并使得焊缝更容易出现M-A组元;降低焊丝的硅含量可减少焊缝中引起焊缝脆性的M-A组元的产生,从而提高该钢激光填丝焊的焊缝质量.

The filler wire laser welding of low carbon low silicon non-oriented electrical steel was performed using 15 kW CO2 laser welding equipment with different welding parameters.The tensile testing,microhardness measurement and microstructure analysis of the welded specimen were carried out.The rules of the weld microstructure and properties with different weld linear energies were obtained.The results show that with reducing linear energy,the weld microstructure varies from block ferrite to needle-like ferrite and granular bainite,and finally M-A constituent with obvious orientation could be found in the weld seam.The penetration of the electric steel was reduced,and it is easier for M-A constituent to form because of the action of silicon in the base metal.Reducing the silicon content in the welding wire may hamper the forming of M-A constituent,raise the toughness of the weld seam and elevate the quality of filler wire laser welding of electric steel.