To provide a lap joint part and its welding method capable of improving connection strength in a shearing direction and a bending direction, and also having stable connection quality.
In a lap welded joint, a first part 1 and second part 2 formed by metallic materials respectively are overlapped each other. The overlapped portion is then irradiated for welding by a source of welding heat (for example, high density energy like arc, laser, electron beam and the like) from the surface of the first part 1. A groove 2a is beforehand formed on the surface of the second part 2 in which the first part 1 is overlapped. The groove 2a covering a full length of a connected portion is formed along a welding direction, and also has a V-shape in section. As compared with conventional cases of welding by arranging the groove 2a in the second part 2 as described in the above and by a prior method, this welding method is capable of improving connecting strength (shearing strength and bending strength) so that a connecting area of the connected portion is increased more than that of the prior method, as melted metal is poured into the groove 2a.
ASAKURA KAZUMASA
TANAKA NORIO
KARIYA YOSHIKI
UCHIYAMA KENJI
