| 摘要 |
<p>A muffler (1) is constituted of a shell (2) wherein a welded part (5) is formed by laser welding along the entire periphery of an abutting part where an upper side half body (3), in which a peripheral wall (32) is provided so as to arise from a peripheral edge of a base plate (31), and a lower half body (4), in which a peripheral wall (42) is provided so as to arise from a peripheral edge of a base plate (41), are made to abut each other at an opening edge. Preferably, flared parts (33, 43) are formed on the upper side half body (3) and the lower side half body (4). Small radius parts (34, 44) that curve toward the outside are formed on the tip edges of the flared parts (33, 43), and the small radius parts (34, 44) that are made to abut may be formed into the welded part (5) by melting with laser welding. When the shell is formed by welding processed products made of metal, it can be easily determined whether reliable joining by laser welding has been carried out, and even if problems with the welding by laser welding arise, adjustment operations can easily be carried out on the production line, and also material costs are reduced, weight is reduced, and techniques can be diversified.</p> |
