Production and manufacturing process at this stage of welding process has been very perfect, many of the use of intelligent robot automatic welding, reasonable reduction of casting defects. According to the study and training of the actual operation staff, the selection of good detection machine equipment and detection method, the selection of welding method can completely consider the necessity of the interconnection of various control modules of metro station body. Riveting car body has high requirements for work clothes and equipment, because holes must be drilled before riveting. If the deviation of riveting holes of two riveting components exceeds 0.5 mm, there will be problems such as failure of connection or gap after connection, easy loosening and poor sealing of all aluminum lantern rivet bolts. 4. Sealing characteristics: there is a gap between the riveting points of riveted car body, which is generally sealed by applying glue. Because of the brittleness of the glue, it is very easy to have problems such as poor sealing. However, because the whole vehicle is welded by electric welding, the sealing performance of the body is excellent, and the service life is (35 years), so it is not necessary to carry out repair again. 5. Maintenance: the whole car body is welded by electric welding, and the price of special-shaped rivet is not necessary to carry out maintenance within the service life. Due to the long-term vibration of the body, the bolt is easy to loosen and the body sealant is easy to be brittle, etc., the inspection and maintenance must be carried out regularly.