Double laser beam welding method for reducing T-shaped joint welding deformation

The invention relates to a double laser beam welding method for a T-shaped joint. The method comprises the step of continuously welding the whole T-shaped joint by using the double laser beams and is characterized by also comprising the position welding step before the continuously welding step, wherein in the position welding step, two joint seams of the T-shaped joint are subjected to tack welding by the double laser beams, so that positioning welding joints are formed on at least one of the two joint seams at intervals and the welding deformation of the T-shaped joint is reduced. Compared with the welding method which does not adopt the position welding step before the step of synchronously and continuously welding on two sides of the double laser beams, the double laser beam welding method for the T-shaped joint has the advantages of reducing welding deformation caused by synchronously and continuously welding on two sides of the double laser beams to the maximum degree and guaranteeing the accuracy of the welding route in the process of synchronously and continuously welding on two sides of the double laser beams. By the method, the welding quality is guaranteed; welding deformation is reduced; and production efficiency is improved.