| 摘要 |
PURPOSE:To relax thermal stress by allowing a space part where a corrugated foil is not present thereon to be fitted with a narrow-width corrugated foil having a width equal to the width of the space on the surface of a flat foil. CONSTITUTION:Two narrow-width corrugated foils 2a, 2b are arranged on both sides on the surface of a flat foil 1 with a space 3 between them so that respective width ends are allowed to conform to the width ends of the flat foil, respectively. A narrow-width corrugated foil 2c having a width equal to that of a space 3 is provided on the position, on the rear surface of the flat foil 1, corresponding to the above space 3 provided on the surface. Subsequently, the flat foil 1 and the corrugated foils 2a-2c mentioned above are simultaneously interposed between electrode pairs 4a, 4b, respectively, and pressurization and energizing are performed by means of respective pointed ends of the above electrode pairs 4a, 4b, by which both foils 1, 2 interposed as mentioned above are subjected to direct spot welding. The resulting honeycomb body 7 is held and fixed in an external cylinder 8. By this method, thermal stress can be relaxed while securing sufficient joining strength in an axial direction and a radial direction. |
