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Vacuum vapor deposition: A spinoff of space welding development [PDF]

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A vapor deposition process has been defined through a spinoff effort of space welding development. In this development for welding in a space environment, a hollow electrode was used to add gas precisely at the welding arc.
Poorman, R. M.
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Characteristics and performance of the variable polarity plasma arc welding process used in the Space Shuttle external tank [PDF]

open access: yes
Significant advantages of the Variable Polarity Plasma Arc (VPPA) Welding Process include faster welding, fewer repairs, less joint preparation, reduced weldment distortion, and absence of porosity.
Hung, R. J., Lee, C. C., Liu, J. W.
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