NDLI: Characteristics and performance of the variable polarity plasma arc welding process used in the space shuttle external tank

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Characteristics and performance of the variable polarity plasma arc welding process used in the space shuttle external tank

Content Provider	NASA Technical Reports Server (NTRS)
Author	Lee, C. C. Hung, R. J. Liu, J. W.
Copyright Year	1990
Description	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. Flow profiles and power distribution of argon plasma gas as a working fluid to produce plasma arc jet in the VPPA welding process was analyzed. Major loss of heat transfer for flow through the nozzle is convective heat transfer; for the plasma jet flow between the outlet of the nozzle and workpiece is radiative heat transfer; and for the flow through the keyhole of the workpiece is convective heat transfer. The majority of the power absorbed by the keyhole of the workpiece is used for melting the solid metal workpiece into a molten metallic puddle. The crown and root widths and the crown and root heights can be predicted. An algorithm for promoting automatic control of flow parameters and the dimensions of the final product of the welding specification to be used for the VPPA Welding System operated at MSFC are provided.
File Size	2059271
Page Count	70
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19920004213
Archival Resource Key	ark:/13960/t5hb41n35
Language	English
Publisher Date	1990-07-01
Access Restriction	Open
Subject Keyword	Mechanical Engineering Convective Heat Transfer Jet Flow Space Shuttles Plasma Arc Welding Flow Characteristics Welded Joints External Tanks Plasma Jets Algorithms Nozzle Flow Flow Distribution Automatic Control Polarity Radiative Heat Transfer Argon Plasma Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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