光学元件激光热导钎焊连接变形及接头组织性能研究OA

To address the challenge of rapid connection between the 40Cr optical component adjustment mount and the optical path assembly mounting plate during alignment and assembly,the conventional welding structure was improved.By pre-brazing copper sheets and employing laser indirect irradiation thermal conduction brazing technology,welding deformation was successfully reduced,and without clamping the adjustment mount,the displacement deviations relative to the mounting plate in three directions was controlled within 20 μm,the angular deviation was less than 0.05°,and the tensile strength of the brazed joint reached 289 MPa.The experiments used a paste-form silver-based filler metal(AgCuZnSn)under the process conditions of a laser beam inclination of 60°,defocusing amount of 20 mm,power of 0.12 kW,and heating time of 10 s.Scanning electron microscopy and energy-dispersive spectroscopy were employed to test and analyze the brazed joints.The results show that the obtained brazing seam structure is uniform,dense,continuous,and intact.The interfaces between the 40Cr steel base material,filler metal zone,and copper sheet zone are distinct,and elemental diffusion between the 40Cr steel and the filler metal is limited to a 2-3 μm zone only at the interface bond,indicating minimal microstructural changes and stress concentration during the welding process.