DocumentCode :
77883
Title :
Study on Electromagnetic Force in Arc Plasma With UHFP-GTAW of Ti-6Al-4V
Author :
Mingxuan Yang ; Bojin Qi ; Baoqiang Cong ; Fangjun Liu ; Zhou Yang ; Chu, Paul K.
Author_Institution :
Dept. of Mater. Process., Beijing Univ. of Aeronaut. & Astronaut., Beijing, China
Volume :
41
Issue :
9
fYear :
2013
fDate :
Sept. 2013
Firstpage :
2561
Lastpage :
2568
Abstract :
Ti-6Al-4V titanium alloy is processed by ultrahigh-frequency pulsed gas tungsten arc welding (UHFP-GTAW), and the correlation between electromagnetic force and pulsed welding efficacy is studied. A mathematical model is formulated to analyze the macroscopic and internal electromagnetic forces. The axial and radial electromagnetic forces inside the arc plasma are evaluated with arc constriction. Meanwhile, the arc profile is also experimentally observed by a camera system to be the experimental evidence for the pinch effect. Owing to arc constriction during the UHFP-GTAW process, the axial component of the macroscopic electromagnetic force decreases, and the arc area diminishes, reducing the root radius. Therefore, larger axial pressure is found. The radial electromagnetic force inside the arc plasma is the most important factor for arc constriction. In addition, the reduced root radius makes the radial electromagnetic force to get reduced with increased pulsed frequency. The attenuation coefficient of magnetic force could be a key parameter for evaluating strength of the arc constriction. With decreased root radius with the UHFP-GTAW, the axial electromagnetic force inside the arc plasma can be maintained at a high level, which affects surface and mobility of the molten pool. The electromagnetic force is observed to have a close correlation with the root radius of the arc, which depends on the pulsed frequency.
Keywords :
aluminium alloys; arc welding; arcs (electric); electromagnetic forces; high-frequency effects; pinch effect; plasma diagnostics; plasma materials processing; plasma pressure; titanium alloys; tungsten; vanadium alloys; TiAlV; UHFP-GTAW; arc plasma; axial electromagnetic forces; axial pressure; camera system; macroscopic electromagnetic forces; magnetic force attenuation coefficient; mathematical model; molten pool; pinch effect; pulsed frequency; pulsed welding; radial electromagnetic forces; ultrahigh-frequency pulsed gas tungsten arc welding; Correlation; Current density; Electromagnetic forces; Force; Mathematical model; Plasmas; Welding; Arc constriction; Ti-6Al-4V ultrahigh-frequency pulsed gas tungsten arc welding (UHFP-GTAW); electromagnetic force;
fLanguage :
English
Journal_Title :
Plasma Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0093-3813
Type :
jour
DOI :
10.1109/TPS.2013.2274810
Filename :
6576812
Link To Document :
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