| 光谱学与光谱分析 |
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| Arc Spectrum Diagnostic and Heat Coupling Mechanism Analysis of Double Wire Pulsed MIG Welding |
| LIU Yong-qiang1, LI Huan1, YANG Li-jun1*, ZHENG Kai1, GAO Ying2 |
1. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China
2. Tianjin Key Laboratory of High Speed Cutting and Precision Machining, Tianjin University of Technology and Education, Tianjin 300222, China |
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Abstract A double wire pulsed MIG welding test system was built in the present paper, in order to analyze the heat-coupling mechanism of double wire pulsed MIG welding, and study arc temperature field. Spectroscopic technique was used in diagnostic analysis of the arc, plasma radiation was collected by using hollow probe method to obtain the arc plasma optical signal. The electron temperature of double wire pulsed MIG welding arc plasma was calculated by using Boltzmann diagram method, the electron temperature distribution was obtained, a comprehensive analysis of the arc was conducted combined with the high speed camera technology and acquisition means of electricity signal. The innovation of this paper is the combination of high-speed camera image information of arc and optical signal of arc plasma to analyze the coupling mechanism for dual arc, and a more intuitive analysis for arc temperature field was conducted. The test results showed that a push-pull output was achieved and droplet transfer mode was a drop in a pulse in the welding process; Two arcs attracted each other under the action of a magnetic field, and shifted to the center of the arc in welding process, so a new heat center was formed at the geometric center of the double arc, and flowing up phenomenon occurred on the arc; Dual arc electronic temperature showed an inverted V-shaped distribution overall, and at the geometric center of the double arc, the arc electron temperature at 3 mm off the workpiece surface was the highest, which was 16 887.66 K, about 4 900 K higher than the lowest temperature 11 963.63 K.
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Received: 2013-12-26
Accepted: 2014-03-18
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Corresponding Authors:
YANG Li-jun
E-mail: yljabc@tju.edu.cn
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