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1. Foreword: 1. Application status of titanium-nickel alloy and stainless steel. Application status of laser welding. Defects in laser welding of titanium-nickel alloy and stainless steel. The research content of this paper is put forward in view of these shortcomings.

Test: 1. Test materials, including composition and mechanical properties. 2. Laser parameters, including laser type, wavelength, power and shielding gas. 3. Pre-welding treatment methods (surface polishing, degreasing, etc.). ) .4. Inspection method: tissue observation (optical microscope, scanning electron microscope, electron probe, etc. Mechanical performance test (tensile and impact test, etc.).

Three. Results and discussion

1. Welding surface morphology and back surface morphology under different welding parameters: (parameters include: laser power, defocusing, welding speed, shielding gas flow rate, laser waveform, etc. If the pulsed laser still has frequency influence).

2. Cross-sectional morphology of the joint under different welding parameters.

3. Microstructure observation of grain size, phase composition, defect analysis and hardness under different welding parameters (optical microscope, scanning electron microscope and hardness tester).

4. Mechanical properties (tensile, impact and other results, the average value of three samples.

Fracture analysis: fracture mode and port morphology (scanning electron microscope)

Four. conclusion

Verb (abbreviation of verb) reference

Sixth, thank you.