Research Progress on Wettability Improvement and Regulation Strategies in Brazing of Dissimilar Materials

LI Shengnan; CHI Qiang; FENG Hui; ZHANG Lei; JIU Yongtao; LONG Weimin

doi:10.3969/j.issn.1674-6457.2025.06.005

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (6) : 46-55. DOI: 10.3969/j.issn.1674-6457.2025.06.005

Precision Brazing

Research Progress on Wettability Improvement and Regulation Strategies in Brazing of Dissimilar Materials

LI Shengnan¹, CHI Qiang^1*, FENG Hui¹, ZHANG Lei², JIU Yongtao², LONG Weimin³

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Abstract

Brazing is widely used in petrochemical industry, electronic packaging, energy, electric power, aerospace and other fields because of its advantages of low joint stress, small deformation, and the ability to connect dissimilar materials, etc. Brazing dissimilar materials is difficult since the significant physical properties of the interfaces. The wettability of brazing filler metal on base metal is the basis for brazing, and the wettability problem has become a key challenge restricting the high-reliability joining of dissimilar materials. The mechanism of wetting and its characterization in brazing were described in detail through systematic literature investigation and analysis. Through the analysis on the affecting factors of wettability, the improvement methods and regulation strategies were summarized, including perfecting the composition of brazing filler metal, formulating a suitable brazing process, and changing the state of the base metal surface. The mechanism of improving wettability was revealed, including promoting the dissolution and reaction between filler metal and base metal elements, and reducing the interface energy. The research results can be used to guide the research and development of new brazing filler metals and the formulation of brazing processes, so as to improve the quality of brazed joints and provide important technical support for high-precision, high-efficiency and high-performance brazing of complex dissimilar materials.

Key words

brazing / wetting angle / reactive wetting / nonreactive wetting / affecting factors of wettability

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LI Shengnan, CHI Qiang, FENG Hui, ZHANG Lei, JIU Yongtao, LONG Weimin. Research Progress on Wettability Improvement and Regulation Strategies in Brazing of Dissimilar Materials[J]. Journal of Netshape Forming Engineering. 2025, 17(6): 46-55 https://doi.org/10.3969/j.issn.1674-6457.2025.06.005

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Funding

National Key R&D Program of China (2024YFB3714100); The Natural Science Basis Research Plan in Shaanxi Province of China (2025JC-YBQN-668); Key Science and Technology Projects for Basic and Prospective Research of CNPC (2023ZZ11)