Joint structure and method of producing same

摘要

A joint structure including a first member and a second member which are jointed to each other to define a flow passage in which a fluid flows. One of the first and second members includes a weldable portion which projects toward an opposed surface of the other of the first and second members in a first direction and whose end portion is fused and welded to the opposed surface, so as to joint the first and second members to each other at a first position in the first direction. One of the first and second members includes a first projecting portion which is provided between the weldable portion and the flow passage in a second direction perpendicular to the first direction, and projects toward the other of the first and second members such that a free end of the first projecting portion is located at a second position different from the first position in the first direction, while the first projecting portion cooperates with the weldable portion to define a first space therebetween in the second direction.