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《Journal of Materials Engineering》 2011-12
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Weld Formation Stability and Force in Variable Polarity Plasma Arc Keyhole Welding

HAN Yong-quan1,GUO Long1,CHEN Shu-jun2,DU Mao-hua1,WU Yong-jun1 (1 Materials Forming Key Laboratory,Inner Mongolia University of Technology, Hohhot 010051,China;2 College of Mechanical Engineering and Applied Electronics Technology,Beijing University of Technology,Beijing 100022,China)  
Using YB005-01 pressure transmitter the plasma arc force in positive polarity was greater than that in reverse polarity was measured.The thermal and force models on aluminum alloy variable polarity plasma arc(VPPA) keyhole molten pool were built.The stability of keyhole molten pool and the forming mechanism of weld under the action of thermal and force in asymmetric positive and reverse polarity plasma arc were analyzed.By further analysis of aluminum alloy variable polarity plasma arc mechanical and thermal characteristics,the key welding influence factors on welding current and plasma air flow were mastered.According to the keyhole welding process testing,the reasonably selected positive and reverse polarity current amplitude and plasma air flow which keep thermal and force balance during keyhole welding process provided theoretical support for getting stable technique parameters in aluminum alloy variable polarity plasma arc welding.
【Fund】: 国家自然科学基金资助项目(50764007 50775003)
【CateGory Index】: TG456.2
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