Abstract: Based on the analysis of the structure of the guide beam composition that was an important part of long railway wagons,the overall welding process was planned. According to the irregular shape of its spatial structure,the special process equipment was adopted to determine the assembly process benchmark. The material of the components was analyzed and identified. In accordance with the welding of WELTEN780 A low alloy high strength steel and different materials,the corresponding welding method was selected,and the welding materials and welding parameters were determined. The main welding deformation was analyzed,and reasonable and effective measures and methods were taken to correct it. A reasonable welding and machining sequence was made to ensure the position and size of the guide sleeve. The welding process problems were solved such as welding quality assurance of guide beam composition under heavy load and complex structure,welding quality assurance of WEL-TEN780 A low alloy high strength steel and different materials,welding deformation control and post-weld correction of medium and heavy plate and location dimension assurance of main parts. Finally,the requirements of geometrical tolerance and dimension of guide beam composition were met,and the overall welding quality requirements were guaranteed.