Engine bifurcated tail spray pipe weld joint laser shock peening and correcting method and device

The invention discloses an engine bifurcated tail spray pipe weld joint laser shock peening and correcting method and device. The method comprises the following steps: performing failure analysis on atail spray pipe, determining a weld joint area needing to perform laser shock peening, performing shock peening on the weld joint area needing to be peened by a laser shock peening unit according toa shock peening parameter of a thin-wall plate, measuring a material dynamic strain field of a laser shock peening area on line by virtue of an optical measuring instrument, calculating strain field data to acquire a material dynamic constitutive equation and dynamic strain rate data, aligning a tail spray pipe measuring model with a CAD model by virtue of a three-dimensional outline scanner, calculating curvature error and torsion error of a tail spray pipe reinforcement area, transmitting all the measured data to a whole machine control system, adjusting a laser parameter of shock peening and determining the laser parameter needing to be corrected and a correcting route, and correcting torsion and bending in the tail spray pipe reinforcement process through the laser shock peening unit.