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| Mathematical Model of Quasi-state Temperature Distribution of Hot-Wire during Hot-Wire TIG Welding Process |
| ZHAO Fu-Hai-a, b , HUA Xue-Ming-a, b , YE Xin-a, b , WU Yi-Xiong-a, b , c |
| (a. Welding Engineering Institute of Materials Science and Engineering; b. Shanghai Key Laboratory of Materials Laser Processing and Modification; c. State Key Laboratory of MetalMatrix Composite, Shanghai Jiaotong University, Shanghai 200240, China) |
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Abstract Based on the law of the conservation of energy and Fouriers law, the mathematical odels respectively considering the effect of resistance heat and the heat transferred through the weld pool on the hotwire temperature distribution were developed. And then based on the superposition principle the mathematical model of quasistate temperature distribution of hotwire heated by resistance energy was developed. The accuracy of the mathematical model was validated by comparing the result of calculating from the mathematical model with the experimental result from the literature. The impact of current density, wire feeding speed, wire extension on temperature distribution of hot-wire was elaborately discussed. The results show that the mathematical model has high accuracy to effectively analyze the process of wire heated by resistance energy. The larger the current density or wire extension is, the higher the temperature in different positions on the wire extension is, however, the bigger the wire feeding speed is, the higher the preheating temperature is. In some certain cases, the matching relations among current density, wire feeding speed and wire extension can be concluded.
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Received: 20 June 2011
Published: 30 July 2012
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