Investigations were made of the effects of high-frequency, d-c, straight polarity current pulsations in the range of 2,000-25,000 pulses/s on the quality and mechanical properties of gas tungsten arc (GTA) welds in 2219 aluminum.Pulsed-current and conventional GTA welds were made on 0.125, 0.250, and 0.350 in 2219 aluminum, using free fall, single-pass butt welds. Results of this investigation show that pulsed-current welds are superior in x-ray integrity to conventional GTA welds made under similar conditions, with discontinuity levels 80% lower for relatively long weldments. High-frequency pulsation is also very effective in avoiding the typical cast structure of weld metal. Such welds exhibit fracture toughness values 10-15% higher than conventional GTA weldments.Potential manufacturing advantages include higher weld quality (fewer rejects and lower rework costs) and thinner weld lands, which result in lower structural weights.


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    Title :

    High-Frequency, Pulsed-Current GTA Welding


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    National Aerospace Engineering and Manufacturing Meeting ; 1972



    Publication date :

    1972-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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