Abstract: A merging pipe wherein branch pipes can be easily welded to each other in a joint portion even when an intersect angle .alpha. between axes of both the branch pipes is set to a small value to reduce merging resistance. In the merging pipe, a plurality of branch pipes are obliquely arranged and bent at their joined ends to extend in the axial direction downstream of confluence. Circumferential walls of the branch pipes adjacent to each other at the joined ends are formed into abutting walls held in close contact relation. Flange walls are formed between the abutting walls and circumferential walls of the branch pipes. The branch pipes are joined together at the abutting walls along their outer peripheral edges.

Abstract: The invention is directed to a connection of a plate and a pair of tubular members. The plate has an aperture defined therein, and a tubular flange portion which is formed around the aperture and which extends away from a plane of the plate. A first opening end portion of a first tubular member is fitted onto an outer circumferential surface of the flange portion of the plate. And, a second opening end portion of a second tubular member is inserted into the flange portion, with a region of the second opening end portion axially remote from an end thereof pressed into contact with an inner circumferential surface of the flange portion. It is arranged that at least a part of an outer surface of the second opening end portion between the end of the second opening end portion and the region is pressed into contact with an inner surface of the first tubular member.