Benefit from NASA
In order to more easily join the huge sections of the Space Shuttle external tank, Marshall Space Flight Center initiated development of the existing concept of Variable Polarity Plasma Arc (VPPA) welding. VPPA welding employs a variable current waveform that allows the system to operate for preset time increments in either of two polarity modes for effective joining of light alloys.
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Details
NASA ID
9311278
Date Created
January 1, 1996
Center
MSFC
Media Type
image
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