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DING Kun, YAO Heqing, FAN Xinghui, WANG Shouyan. Welding arc load characteristics of variable polarity TIG welding and its control strategy at commutation[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2008, (9): 31-34.
Citation: DING Kun, YAO Heqing, FAN Xinghui, WANG Shouyan. Welding arc load characteristics of variable polarity TIG welding and its control strategy at commutation[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2008, (9): 31-34.
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Welding arc load characteristics of variable polarity TIG welding and its control strategy at commutation

  • 1.

    College of Mechanical & Electrical Engineering, Hohai University, Changzhou 213022, Jiangsu, China;College of Electrical Engineering, Hohai University, Nanjing 210098, China

  • 2.

    College of Mechanical & Electrical Engineering, Hohai University, Changzhou 213022, Jiangsu, China

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  • Received Date: September 17, 2007
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    • Abstract
  • Welding arc load characteristics of variable polarity TIG welding was studied through experiment.The experimental results indicate that equivalent resistance of welding arc in EN is less than it in EP, both of them decrease as increasing of welding current, the equivalent resistance will drop rapidly at the time when EP commutate to EN.The mechanism of equivalent resistance analyzed is concerned with the working mechanism of negative, arc column and anodic at different load current.A control strategy incorporate variable parameter PI into advance control is presented to solve the problem of vary equivalent resistance at the time EP commutate to EN.Experimental results prove this control strategy is available.
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