Cemented carbide wires YG8 and ultrahigh-strength steel strips D6A were welded on the band saw blade by using CO2 laser.The typical microstructure of welding joints,the distribution of element,and influence of different bonding technologies on welding joints microstructure and mechanical properties were studied by using metalloscope,electron microscope(SEM),microhardness meter and electron(EPMA).The results showed that isometric increased,dendrite decreased in the weld center and isometric near the side of YG8 fusion boundary area became more fine with the increase of welding speed .The hardness of the welding joints every bonding technology was higher than parent metal.Moreover,the hardness of the bond area near the side of YG8 was higher than the welded zones.When the welding power was 3 960 W and the welding speed was 9 m/min,the property of the wedded joints was good,and the value of bending strength reached 349 MPa,which reached the requirements of double metal band saw blade welding.