NASA NTRS · 19900000077
Physics Of Variable-Polarity Plasma Arc Welding
Abstract
Report describes experimental study of some of the physical and chemical effects that occur during variable-polarity plasma arc (VPPA) keyhole welding of 2219 aluminum alloy. Comprised three major programs: (1) determination of effects of chemical additions (i.e., impurities) on structure and shape of bead and keyhole; (2) determination of flow in regions surrounding keyhole; (3) development of analog used easily to study flow in keyhole region.
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Walsh, Daniel W., Nunes, Arthur C., Jr.. 1990-02-01. Physics Of Variable-Polarity Plasma Arc Welding. https://ntrs.nasa.gov/citations/19900000077
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