Fabricating plate heat exchanger that is useful in cooling circuit of nuclear power plant, by forming channel between lower and upper heat exchanger plates, and parallely arranging intermediate plates between lower and upper plates

摘要

The process comprises forming a channel (16) between two adjacent heat exchanger plates such as lower (12) and upper (14) plates, and parallely arranging intermediate plates one above the other between the lower and upper plates. The channel is formed by the deposition of a material (18) on the lower plate so that the channel is delimited by the deposited material and plates. The deposition of material is carried out by melting the material by a laser and by applying the molten material on the lower plate in the form of beads to form walls of the channel. The process comprises forming a channel (16) between two adjacent heat exchanger plates such as lower (12) and upper (14) plates, and parallely arranging intermediate plates one above the other between the lower and upper plates. The channel is formed by the deposition of a material (18) on the lower plate so that the channel is delimited by the deposited material and plates. The deposition of material is carried out by melting the material by a laser and by applying the molten material on the lower plate in the form of beads to form walls of the channel. The process further comprises leveling the deposited material so that the material has an apex designed to cooperate with the upper plate, and performing transparent laser welding on the upper plate with the deposited material. A thickness of the lower plate is greater than a thickness of the intermediate plates. The material deposited on the lower plate extends on lateral edges of the lower plate.