A Two-Stage Variable Pressure Diffusion Bonding for Manufacturing High-Precision Steel Hollow Structural Components
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Conventional diffusion bonding is normally conducted under constant bonding pressure, resulting in obvious deformation of the joined component, thereby destroying the internal structures. To address this problem, this study proposed a two-stage variable pressure diffusion bonding to fabricate the high-precision steel hollow structural component. In the first stage, a short-time higher bonding pressure was applied to significantly improve the local micro-plastic deformation of the surface asperity; in the second stage, a lower bonding pressure was used to continuously act on the bonding process. The macroscopic deformation, interfacial characteristics and shear strength were analyzed. Results showed that a well-joined hollow structural component was manufactured, in which a high interfacial bonding ratio of 98.2%, shear strength of 818 MPa close to that of the base material and limited macroscopic deformation of 4.9% were achieved.
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