WELDED STRUCTURE AND METHOD FOR MANUFACTURING THE SAME

摘要

The purpose of the present invention is to provide a welded structure capable of reducing fractures of a welded section. According to the present invention, there is provided a welded structure in which two or three steel plates (11, 12) are bonded by spot welding in a plurality of locations in a stacked section where the steel plates are stacked. In this welded structure, with the diameter of a nugget (14) denoted by dng(mm), the tip diameter of an electrode used in spot welding denoted by d(mm), and the average thickness per steel plate in the stacked section denoted by tave(mm), the spot welded section satisfies the relationship dng > d(tave)1/2 in accordance with the average thickness tave(mm) when 0.5 mm = tave < 1.1 mm, and satisfies the relationship dng > 1.05 d when 1.1 mm = tave = 2.6 mm.