Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Nisshin Steel Co., Ltd.

Kensuke Tsubota

Shunichi Hashimoto

Zenzo Yamaguchi

Ichiro Yamagiwa

Hiroki Ueda

Toshimitsu Tanaka

Seiji Sasabe

Jun Katoh

Hiroyuki Takeda

Fumihiro Sato

Tetsu Iwase

Mitsuo Hino

A sound absorbing structure having excellent in sound absorbing performance, which is capable of achieving 0.4 or higher in the sound absorbing coefficient even in the case where a perforated panel is a thin plate such as aluminum foil within a range where a reduction in the weight of a vehicle body is not impaired and through holes have a large hole diameter in order to make the processing of providing a large number of through holes in the perforated panel. The sound absorbing structureis the sound absorbing structurefor suppressing noise generated on a sound source side, which is equipped with: a perforated panelhaving a large number of through holesand a fiber material, which are provided so as to face the sound source side and provided so as to overlap with each other; and an air layerprovided behind the perforated panel, in which the density and the thickness of the fiber materialand the hole diameter and the aperture rate of the through holesof the perforated panelseverally have a specific relationship.

Sound absorbing structure

A joined part of an aluminum-coated steel sheet and an aluminum sheet is composed of an intermetallic compound layer which exists in a region in which a part of a coated layer exists before the joining and an aluminum melted and solidified part which also exists on the side of the aluminum sheet to enclose the intermetallic compound layer. The atoms existing on the surface of the aluminum melted and solidified part are intermetallic-bonded with atoms which exist on the surface of the steel sheet except in the region in which the intermetallic compound layer exists seen in the plan view. Further, the area of the intermetallic compound layer is limited to 60% or less of the total area of the joined part at the interface between the aluminum-coated steel sheet and the aluminum sheet. Thus, the area of the aluminum melted and solidified part exceeds 40% of the total area of the joined part. The strong joining having a high fracture energy can be provided at a high efficiency.

Weldment of different materials and resistance spot welding method

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Tokyo, Japan

Kensuke Tsubota