Analysis of anode temperature stability in hollow cathode vacuum arc brazing under multi-parameter coupling based on...

Area of Science:

• Materials Science and Engineering
• Plasma Physics
• Computational Fluid Dynamics

Background:

• Anode temperature instability in hollow cathode vacuum arc brazing causes joint temperature fluctuations and base material melting.
• Controlling anode temperature is critical for stable brazing processes.

Purpose of the Study:

• To investigate anode temperature stability under multi-parameter coupling in hollow cathode vacuum arc brazing.
• To develop a predictive model for anode temperature stability.

Main Methods:

• Established a multiphysics mathematical model integrating fluid flow, plasma, and temperature fields.
• Performed numerical simulations using COMSOL Multiphysics.
• Developed a stability model using a combined Multilayer Perceptron (MLP) and Symbolic Regression (SR) approach.

Main Results:

• Anode temperature positively correlates with argon flow rate and current, and negatively with bipolar spacing and cathode tube radius.
• The developed stability model demonstrated high prediction accuracy with MAE of 0.83, RMSE of 0.95, and MAPE of 3.49%.
• Validation using actual welding parameters confirmed the model's effectiveness.

Conclusions:

• The proposed anode temperature stability model provides a robust theoretical foundation for hollow cathode vacuum arc brazing.
• The model supports the development of closed-loop intelligent control systems for enhanced brazing processes.