Welded Bogie Typical Welded Structure Fatigue Properties And Welding

Bogie is the key component of rail vehicle, bearing the body weight and the vibration of the cyclic loading caused by the track, its anti-fatigue properties is a direct impact on the safety of train travel.The welding of bogie is characterized as big stiffness, lots of welds and complex distribution. Among these welds,most of the loads were carried by T-type fillet welds, such as the welds between the frame side plate and the cover board, beams casting and side plate, positioning seat and the side beam cover board etc.Typically, the fatigue strength of fillet much lower than the corresponding fatigue strength of butt welds.In general,the fatigue crack initiation in the weld toe for the penetration-type T-fillet. If we can improve the anti-crack initiation performance on the weld toe, we will improve the fatigue strength of welded joints effectively, and improve the reliability and life of welded bogies.In this paper, the effects of the welding process factors on the bogie's conventional mechanical properties and fatigue performance were mainly studied, including the purity and ratio of the mixture shield gas, welding materials, welding parameters,weld groove form,weld surface treatment status,as well as the surface shape of the weld. The results will provide the experimental data for the design and manufacture of the bogie welded frame of high-speed passenger car.