Riveting-assisted rotary friction welding process for dissimilar metal bar and application

Abstract

The invention provides a riveting-assisted rotary friction welding process for preparing a high-strength dissimilar metal bar structure. The riveting-assisted rotary friction welding process is particularly suitable for preparing the dissimilar metal structure with high performance and large hardness difference. According to the method, the process advantages of rotary friction welding can be fully exerted, meanwhile, the interface bonding performance of a central area is improved by utilizing a riveting mode, on the basis that the production cost is not obviously increased, the performance of the composite structure of the dissimilar metal bar can be remarkably improved, and the high-performance dissimilar metal bar structural part can be directly obtained.

Description

technical field [0001] The invention relates to the technical field of material processing, in particular to a riveting-assisted rotary friction welding process and application of large-difference dissimilar metal bars. Background technique [0002] The existing technology shows that although the performance of the welded dissimilar metal joint can be optimized by adjusting the process parameters in the rotational friction welding, due to the difference in the rotational speed of the rotational friction welding in the radial direction, the heat generation rate of the interface in the radial direction , temperature distribution, etc., which further caused the inhomogeneity of the interface structure and performance. Through a large number of tests, it was found that at the center of the joint, since the rotational speed is almost zero, the increase of the interface temperature mainly depends on the heat conduction in the outer high temperature area, so the metallurgical react...

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Problems solved by technology

[0002] The existing technology shows that although the performance of the welded dissimilar metal joint can be optimized by adjusting the process parameters in the rotational friction welding, due to the difference in the rotational speed of the rotational friction welding in the radial direction, the heat generation rate of the interface in the radial direction , temperature distribution, etc., which further caused the inhomogeneity of the interface structure and properties

Through a large number of tests, it was found that at the center of the joint, since the rotational speed is almost zero, the increase of the interface temperature mainly depends on the heat conduction in the outer high temperature area, so the metallurgical reaction at the interface is extremely insufficient, which is the weak link of the entire joint

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