Heat exchanger construction

In a heat exchanger of the type comprising a heat exchanging core assembly having a plurality of fluid conducting conduit members surrounded by heat radiating fins, an inlet header connected to one end of each of a first group of said conduit members, an outlet header connected to one end of each of a second group of said conduit members and means interconnecting the other ends of said first group of conduit members with the other ends of said second group of conduit members, the improvement wherein said interconnecting means comprises:

• a base member overlying end portions of said conduit members, said base member having a plurality of openings defined by tapered tubular projections extending outwardly on one side of said base member, each of said projections being secured in fluid conducting telescopic relationship with one of said other ends of said fluid conduit members, said projections each having a taper which prevents telescopic movement of said one of said other ends beyond a plane defined by said base member;
• an elongated cover member having a plurality of transversely extending raised spaced embossments, each of said raised embossments being positioned so as to overlie and extend between at least first and second ones of said plurality of openings whereby said raised portion and said base member define a fluid passageway interconnecting said one of said other ends of said first group with said one of said other ends of said second group of fluid conduit members;
• a plurality of spot welds spaced between and adjacent opposite ends of said embossments for retaining said cover member directly to another side of said base member at a plurality of spaced locations intermediate each of said plurality of embossments;
• and
• sealing means further securing said base member and said cover member subsequent to application of said spot welds, said sealing means also securing each of said one of said other ends within respective of said tubular projections whereby said sealing means may operate to create a substantially fluid tight sealing relationship therebetween.