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Vaccum Gas Tungsten Arc Welding, phase 1This two year program will investigate Vacuum Gas Tungsten Arc Welding (VGTAW) as a method to modify or improve the weldability of normally difficult-to-weld materials. VGTAW appears to offer a significant improvement in weldability because of the clean environment and lower heat input needed. The overall objective of the program is to develop the VGTAW technology and implement it into a manufacturing environment that will result in lower cost, better quality and higher reliability aerospace components for the space shuttle and other NASA space systems. Phase 1 of this program was aimed at demonstrating the process's ability to weld normally difficult-to-weld materials. Phase 2 will focus on further evaluation, a hardware demonstration and a plan to implement VGTAW technology into a manufacturing environment. During Phase 1, the following tasks were performed: (1) Task 11000 Facility Modification - an existing vacuum chamber was modified and adapted to a GTAW power supply; (2) Task 12000 Materials Selection - four difficult-to-weld materials typically used in the construction of aerospace hardware were chosen for study; (3) Task 13000 VGTAW Experiments - welding experiments were conducted under vacuum using the hollow tungsten electrode and evaluation. As a result of this effort, two materials, NARloy Z and Incoloy 903, were downselected for further characterization in Phase 2; and (4) Task 13100 Aluminum-Lithium Weld Studies - this task was added to the original work statement to investigate the effects of vacuum welding and weld pool vibration on aluminum-lithium alloys.
Document ID
19950017644
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Weeks, J. L. (Rockwell International Corp. Canoga Park, CA, United States)
Krotz, P. D. (Rockwell International Corp. Canoga Park, CA, United States)
Todd, D. T. (Rockwell International Corp. Canoga Park, CA, United States)
Liaw, Y. K. (Rockwell International Corp. Canoga Park, CA, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1995
Subject Category
Mechanical Engineering
Report/Patent Number
NAS 1.26:197979
NASA-CR-197979
RI/RD95-146
Accession Number
95N24064
Funding Number(s)
CONTRACT_GRANT: NAS8-39932
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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