Li Wanjun, electric welder, senior worker technician, chief technical expert of CRRC. He joined the work in August 1987. For 36 years, he has always stuck to the welding position of the rail car bogie. With his superb welding skills and intelligence, he overcame one after another worldwide welding problems of the bogie with the spirit of hard research and never say die. It has created the first time in the field of rail car welding in the world@ Welding Production Line Group of Bogie Business Department of CRRC Changchun Railway Vehicles Co., Ltd