The X ray diffraction method（XRD） was used to test the welding residual stress in the same part of the side beam of the bogie in the processes of production and fatigue test. The change rules of the welding residual stress in the processes of production and service were obtained

which provided theoretical support for improving the manufacturing process of the bogie. The results showed that the surface for incoming side beam existed compressive stress. Residue pressure with non-uniform distribution and high tensile stress was found in the bogie parts after welding and heat repairing. After heat treatment

welding residual stress was greatly reduced

the residual stress tends to be uniform. After sandblasting

the residual stress on the beam surface was changed from tensile stress into favorable compressive stress

which benefited the fatigue property. After frame fatigue test of 6 million cycles

the residual compressive stress relaxation did not occur. After fatigue test of 12 million cycles

the residual compressive stress on the surface significantly decreased

while the stress was relaxed and redistributed to be more uniform.