Influence of Welding Parameters on Formation and Mechanical Properties of Lap Fillet Welded Carbon Steel Joints in Oscillation Laser Welding with Filler Wire

doi:10.3901/JME.2025.02.172

Abstract

Abstract: Based on the oscillation laser welding with filler wire, the effects of laser tilt angle, laser power and welding speed on the surface 3D appearance, macro defects, microstructure and mechanical properties of low carbon steel joints in lap fillet configuration were investigated. The results indicate that the comparatively low laser tilt angle results in incomplete fusion and wedge-shaped notches around the weld root. These defects can be modified by increasing the laser tilt angle, laser power and welding speed, simultaneously. The microstructure in the fusion zone (FZ) is mainly lath martensite, while it is ferrite and pearlite in the heat-affected zone (HAZ) adjacent to the base metal, which contains more pearlite than the base metal. The dominant phases in the HAZ near the FZ are ferrite, martensite and cementite. Narrowed weld width, shortened weld height and significant wedge-shaped notch can cause crack propagation through the FZ, resultantly lead to premature failure, which reflects a severe reduction in energy absorption during the tensile-shear tests. Resultantly, the influence mechanism of laser tilt angle on the weld seam formability, microstructure and mechanical properties of oscillation laser welded joints with filler wire were clarified via the experiment and laser energy distribution calculation. Through the regulation and matching of laser tilt angle, laser power and welding speed, the defect-free weld joints with the same strength as the base metal were obtained.

Key words: oscillation laser welding with filler wire, lap fillet weld, microstructure, mechanical properties, fracture modes

CLC Number:

TG456

WU Guanzhi, CHEN Nannan, SHI Huabing, LIU Kunshan, KONG Liang, WANG Min. Influence of Welding Parameters on Formation and Mechanical Properties of Lap Fillet Welded Carbon Steel Joints in Oscillation Laser Welding with Filler Wire[J]. Journal of Mechanical Engineering, 2025, 61(2): 172-180.

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