JOINED STRUCTURE AND ITS MANUFACTURE

摘要

PURPOSE:To provide an inexpensive joined structure and its manufacturing method where the exprosive scattering of the fusion zone is suppressed, and the laser beam welding can be executed in an excellent and stable manner. CONSTITUTION:A joined structure consists of a first member 1 having a laser beam irradiating surface 15 and a second member 2 which is arranged on the opposite side to the laser beam irradiating surface 15 and whose laser beam absorption ratio is higher than that of the first member 1. A first film 11 whose laser absorption ratio is higher than that of the first member 1 is arranged on the laser beam irradiating surface 15 side of the first member 1. A joining layer 3 is interposed between the first member 1 and the second member 2. The joined structure 3 consists of a third film 23 which is arranged on the first member 1 side and whose laser beam absorption ratio is higher than that of the first member 1 or whose melting point is lower than that of the first member 1, and a second film 22 which is arranged on the second member side and whose laser beam absorption ratio is lower than that of the second member or whose melting point is higher than that of the first member 1.