Diffusion bonding tool and method special for copper steel

Abstract

The invention discloses a diffusion bonding tool and method special for copper steel, and belongs to the technical field of diffusion welding of dissimilar materials. The diffusion bonding tool and method special for copper steel solve the problems of internal stress existing in welding seams and low joint strength in existing copper-steel diffusion bonding of a copper-steel composite heat exchanger. An expansion core is of a cylindrical structure, and the outer circular surface of the expansion core is of a conical surface; a plurality of expansion petals are arranged in a copper ring aroundthe central axis of the copper ring; each expansion petal is in contact with the inner wall of the copper ring without gap; one side surface, away from the copper ring, of each expansion petal is an inclined surface; the expansion core is matched and inserted into an annular structure formed by the plurality of expansion petals; the inner diameter of a small end of the annular structure is smallerthan the outer diameter of a small end of the expansion core; and the inner diameter of a large end of the annular structure is smaller than the outer diameter of a large end of the expansion core. The expansion core is pressed downwards by a diffusion welding press, the outer conical surface of the expansion core transmits lateral force to the copper ring through the expansion petals, and the pressure between the copper ring and a steel ring enables materials on the two sides to generate interatomic diffusion, so that the internal stress in the welding seams is effectively reduced, and the joint strength is guaranteed.

Description

technical field [0001] The invention relates to a special diffusion connection tool for copper and steel and a diffusion connection method, belonging to the technical field of diffusion welding of dissimilar materials. Background technique [0002] Diffusion welding is to clamp two workpieces to be welded together, place them in a vacuum or protective atmosphere furnace and heat them, so that the tiny unevenness of the two welding surfaces will produce microscopic plastic deformation, so as to achieve close contact. In the subsequent heat preservation and heating, the atoms Diffusion bonding method in which metallurgical bonding is formed by interdiffusion between them. Copper has the characteristics of high thermal conductivity and good ablation resistance, and stainless steel has the characteristics of high temperature strength and good load-bearing performance. Using vacuum diffusion connection technology to manufacture copper-steel composite heat exchangers can give full...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of internal stress in the welding seam of structural parts and low joint strength existing in the existing copper-steel diffusion connection technology for copper-steel composite heat exchangers, and further provides a copper-steel special diffusion connection Tooling and Diffusion Connection Method

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