Exhaust gas heat exchanger has pairs of laminating plates each with protruding circumferential parts overlapping one another in laminating direction and connected by welding

摘要

The heat exchanger includes a number of units each formed from a pair of laminating plates (131, 132) with one plate formed integral with a first protruding circumferential part (133) which extends in the laminating direction whilst the other plate is formed integral with a second protruding circumferential part (134) which extends in the other laminating direction so that the two protruding circumferential parts can overlap one another parallel to the laminating directions and the overlapped surfaces can be connected together through welding. A deformable thin metal plate is set between each of the connecting blocks and the first protruding part to connect the blocks to the laminating plates.