Simulation Analysis of Brazing Temperature Field in Vacuum Arc Extinguishing Chamber

LI Xiaozhao; ZHAO Fangshuai; CHAI Na; GUO Runtao; GU Fengjuan; ZHOU Xusheng; PEI Yinyin

doi:10.3969/j.issn.1674-6457.2025.06.012

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (6) : 109-118. DOI: 10.3969/j.issn.1674-6457.2025.06.012

Precision Brazing

Simulation Analysis of Brazing Temperature Field in Vacuum Arc Extinguishing Chamber

LI Xiaozhao¹, ZHAO Fangshuai¹, CHAI Na¹, GUO Runtao¹, GU Fengjuan¹, ZHOU Xusheng^2*, PEI Yinyin²

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Abstract

The work aims to obtain the data about the temperature distribution, temperature difference, and holding time by calculating and studying the vacuum brazing temperature field in a vacuum arc extinguishing chamber, in order to guide the brazing process in the chamber. COMSOL Multiphysics, the multi-field coupled finite element analysis software, was used to construct a heat transfer model for vacuum brazing in the arc extinguishing chamber. The simulation results were verified based on the measured temperature of the workpiece. The effect of heating rate, furnace load, and heating strip on the uniformity of temperature field and brazing insulation time was studied. The average error of temperature field simulation during the entire process of vacuum brazing in the arc extinguishing chamber was less than 2%, indicating high model accuracy. As the heating rate increased, the maximum temperature difference of the workpiece significantly increased, and the holding time firstly increased and then remained almost unchanged. During production in bulk, a heating rate of 5 ℃/min resulted in the best temperature field uniformity and required shorter holding time. The uniformity of the brazing temperature field in the arc extinguishing chamber significantly decreased with the increase of furnace load, and the required holding time showed a linear increasing trend. By increasing the intermediate heating zone, the temperature difference during batch brazing in the arc extinguishing chamber was reduced by 16%, and the holding time was shortened by 50%. An accurate and reliable temperature field model for vacuum brazing in the vacuum arc extinguishing chamber has been established. The heating rate suitable for batch production has been calculated by this model, and it has been verified that adding an intermediate heating strip can effectively improve the uniformity of the temperature field and shorten the holding time. The optimization effect of the temperature field is significant.

Key words

vacuum arc extinguishing chamber / vacuum brazing / temperature field / finite element simulation / heating rate / holding time

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LI Xiaozhao, ZHAO Fangshuai, CHAI Na, GUO Runtao, GU Fengjuan, ZHOU Xusheng, PEI Yinyin. Simulation Analysis of Brazing Temperature Field in Vacuum Arc Extinguishing Chamber[J]. Journal of Netshape Forming Engineering. 2025, 17(6): 109-118 https://doi.org/10.3969/j.issn.1674-6457.2025.06.012

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