Gas pressurization diffusion welding method for thin-wall micro-channel heat exchanger core

Abstract

The invention provides a thin-wall micro-channel heat exchanger core gas pressurization diffusion welding method which comprises the following steps: S1, wiping and removing oil stains on a sheet, washing the sheet with clear water, and drying the sheet; s2, spot welding is carried out at the attached positions of the peripheries of the upper plate and the lower plate, so that the two plates form a heat exchanger core; s3, the upper end face of the heat exchanger core in the step S2 is welded, so that a closed cavity is formed in the heat exchanger core; s4, the heat exchanger core in the step S3 is subjected to diffusion welding, and the vacuum degree is 1 * 10 <-2 > Pa or below; and S5, the welding seam and the outward area of the welding seam in the step S3 are cut off, finish machining is conducted, and the finished micro-channel heat exchanger core is obtained, tools are not used, the welding number in the same furnace is large, only the periphery of a part needs to be sealed tightly, and by means of the method, temperature controllability, weldment pressure controllability and weldment deformation controllability can be achieved.

Description

technical field [0001] The invention belongs to the field of diffusion welding, in particular to a method for gas pressurized diffusion welding of a core body of a thin-walled microchannel heat exchanger. Background technique [0002] Heat exchangers are mainly used in power, food, energy, shipbuilding, chemical industry and many other industrial productions. When this part is working, the fluid with higher temperature is transferred to the fluid with lower temperature, so that the fluid temperature reaches the index specified in the process, so as to To meet the needs of process conditions and improve energy utilization, therefore, it is of great significance to reduce the production cost of heat exchangers while improving the performance of heat exchangers; [0003] In the manufacturing process of thin-walled double-layer plate microchannel heat exchangers, two methods are often used in the industry, one is the superimposed brazing process, but its performance is poor unde...

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Problems solved by technology

[0006] In view of this, the present invention aims to propose a method for gas pressurized diffusion welding of the core body of a thin-walled microchannel heat exchanger to solve the problems of uneven pressure and uncontrollable deformation in the welding process

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