Abstract: Silicon steel containing 2 %Si is classified as medium⁃grade non⁃oriented electrical steel. During continuous cold rolling, frequent strip fractures occur, predominantly at the weld seams, severely compromising product quality and reducing roll service life. To mitigate strip fracture issues in the fusion zone of silicon steel, the effects of laser welding parameters were investigated utilizing scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), tensile testing, and hardness measurements. Under constant laser parameters (mode, beam quality, and focal position), optimal weld quality was achieved at a power of 5.8 kW and welding speed of 0.03 m/s.

Key words: laser welding, welding power, welding speed, mechanical properties