Abstract: A metal catalyst carrier for exhaust gas purification, comprising: a metal honeycomb column composed of flat and wavy metal sheets laminated, wound together, and bonded to each other to provide numerous exhaust gas flow paths along the column axis, the honeycomb column having a quasi-elliptical cross section defined by a pair of mutually facing linear portions and a pair of mutually facing curved portions in a plane perpendicular to the column axis, the flat and wavy sheets being bonded in a greater bond rate in the major axial end portions than in the other portion of the quasi-ellipse, the bond rate being defined as a quotient obtained by dividing a bonded length by a total length of lines on which the laminated and wound flat and wavy sheets are in contact with each other; and a columnar metal case fittingly enclosing the honeycomb column and bonded to the honeycomb column only in the portions corresponding to the curved portions of the quasi-elliptical cross section.

Abstract: To improve the strength of the laser weld bond between an inner honeycomb column and an outer metal case, a metal honeycomb assembly comprises a metal honeycomb column composed of a flat metal sheet and a wavy metal sheet which are mutually laminated and spirally wound together, the metal honeycomb column having an outermost circumferential portion in the form of a composite wavy sheet composed of a plurality of superposed layers of the wavy metal sheet; and a metal case fittingly enclosing the metal honeycomb column, the metal case and the metal honeycomb column being bonded together by laser-welding the wave peaks of the composite wavy sheet to an inner wall of the metal case.