The thrust foil bearing is an important support element in the aviation gyroscope. In order to improve the wear resistance and corrosion resistance of the supporting surface

Teflon coating is usually coated on the supporting surface

while the addition of this coating brings uncertainty to the subsequent manufacturing process. In this paper

the effects of laser spot welding process parameters on the microstructure and performance of thrust foil bearing joints were studied. The analysis methods such as optical microscope

scanning electron microscope

electronic precision tensile tester and ultrasonic testing were used to analyze the weld surface forming

joint microstructure and mechanical properties. The results showed that the surface diameter of joint increased with the increase of pulse power

while the tensile shear force increased first and then decreased with the increase of heat input. The optimized process parameters of laser spot welding manufacture: pulse power percentage 22%

pulse width 5.0ms

tensile shear force 63.0N; Ultrasonic immersion testing can accurately measure the size of the lap interface

but the tensile shear force was not fully proportional to the size of the interface. The tensile shear force of the joint was mainly related to the fracture modes of the joint.