Method for leveling side-wall welding deformation of urban rail vehicle

The invention relates to a method for leveling side-wall welding deformation of an urban rail vehicle, comprising the steps of: adopting a gas metal arc welding machine, determining the positions of weld joints, cleaning and polishing areas to be welded, grooving, welding, carrying out welding operation and cold working simultaneously, measuring, grinding and checking the weld joints, wherein thegroove is V-shaped, the depth of the groove is 2/3 of the penetration depth, and a V-shaped groove included angle is 35-65 degrees; and when a welding operator carries out welding operation, the coldworker uses a flat ruler to measure the deformation condition of side walls in the process of welding. In the method, the equipment is simple, safe and reliable, the operation is simple and convenient, the production efficiency is high, the production cost is saved, the economic benefit is high, and the comprehensive cost is reduced by 50% as compared with that of the flame leveling.