| 摘要 |
<p>A flange (6) is a plate member and includes communication holes (11a, 11b, 21a, 21b) with which exhaust gas introducing ends (32, 33, 42, 43) respectively communicate is mounted in the exhaust gas introducing ends. The flange (6) is formed in two piece structures, and one piece (10 (20)) has more than or equal to half of all the communication holes (11a, 11b, 21a, 21b) that are arranged in line. A circumferential section of each communication hole (11a, 11b, 21a, 21b) is welded to an outer periphery of an exhaust gas introducing end (32, 33, 42, 43) on one side of the flange (6).</p> |
