A Zr-based amorphous alloy (thickness = 2 mm) is welded by laser welding. The phase composition and microstructure of the welding joints under different laser powers are analyzed by optical microscopy, X-ray diffraction, and scanning electron microscopy. Mechanical properties of the welded joints under different laser powers are examined using microhardness and tensile testers. The glass forming ability and thermal stability of the welded joints are investigated using differential scanning calorimetry. With an increase in laser power, the degree of crystallization of welded joints increases, their microhardness is in the range 502.3-546.9 HV 0.2 , and tensile strength is up to 583 MPa (75% of that of the Zr-based amorphous alloy). Through the research of the article, it can be found that when the laser power increases, the crystallization degree of the welded joint first increases rapidly and then tends to be stable. The lower laser power should be used as far as possible in the case of penetration.

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