NDLI: Study of gas tungsten arc welding procedures for tantalum alloy t-111 (ta-8 w-2hf) plate

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Study of gas tungsten arc welding procedures for tantalum alloy t-111 (ta-8 w-2hf) plate

Content Provider	NASA Technical Reports Server (NTRS)
Author	Kesterson, R. L. Gold, R. E.
Copyright Year	1973
Description	Methods of eliminating or reducing underbread cracking in multipass GTA welds in thick T-111 plate were studied. Single V butt welds prepared using experimental filler metal compositions and standard weld procedures resulted in only moderate success in reducing underbread cracking. Subsequent procedural changes incorporating manual welding, slower weld speeds, and three or fewer fill passes resulted in crack-free single V welds only when the filler metal was free of hafnium. The double V joint design with successive fill passes on opposite sides of the joint produced excellent welds. The quality of each weld was determined metallographically since the cracking, when present, was very slight and undetectable using standard NDT techniques. Tensile and bend tests were performed on selected weldments. The inherent filler metal strength and the joint geometry determined the strength of the weldment. Hardness and electron beam microprobe traverses were made on selected specimens with the result that significant filler metal-base metal dilution as well as hafnium segregation was detected. A tentative explanation of T-111 plate underbread cracking is presented based on the intrinsic effects of hafnium in the weldment.
File Size	9561419
Page Count	93
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19730019798
Archival Resource Key	ark:/13960/t2h756075
Language	English
Publisher Date	1973-05-01
Access Restriction	Open
Subject Keyword	Machine Elements And Processes Gas Welding Refractory Metals Tantalum Alloys Bend Tests Mechanical Properties Metal Matrix Composites Metallography Cracking Fracturing Arc Welding 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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