The experiments of laser welding 5052 aluminum alloy were carried out, and the effect of adding α-Si3N4 particles on microstructure and mechanical properties of the joint was investigated. Some α-Si3N4 particles melt and form new compounds with the aluminum matrix during welding. The average tensile strength of α-Si3N4 preset joint with the maximum tensile strength of 224.5 MPa was 11.5% higher than that of no-preset joint. As far as presetting α-Si3N4 particles was concerned, the enhancement of the joint properties benefited from improvement of metallurgical reaction.
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