Study on the Influence of Gas Pressure Loading Curve on Interface Weld Ratio in Superplastic Forming/Diffusion Bonding of Four-Layer Sandwich Structures

This paper proposes, for the first time, that the gas pressure loading path significantly influences the weld interface ratio of SPF/DB four-layer sandwich structures. Based on a gas pressure loading curve incorporating back pressure, experimental verification and analysis were conducted. Ultrasonic C-scanning, metallographic examination, and scanning electron microscopy (SEM) were employed to observe and analyze unwelded defects, elucidating their causes and formation mechanisms. Key process parameters—including back pressure time, back pressure value, and gas inlet delay time—were extracted and defined. The influence of these parameters on the weld interface ratio of four-layer sandwich structures was systematically investigated. Finally, with the objectives of eliminating surface grooves and achieving a high weld interface ratio, reference ranges for these process parameters are provided.

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Periodical:

Materials Science Forum (Volume 1185)

Pages:

171-183

DOI:

https://doi.org/10.4028/p-VBNO2g

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Cite this paper

Online since:

April 2026

Authors:

Sheng Jing Liu*, Yan Hong Mu, Xiao Hua Li, Hai Long Lei

Keywords:

Four-Layer Sandwich Structure, Gas Pressure Loading Curve, Interface Weld Ratio, Superplastic Forming/Diffusion Bonding (SPF/DB), Void

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Creative Commons CC BY 4.0

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* - Corresponding Author

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