Investigation of microstructure, surface and subsurface characteristics in titanium alloy friction stir welds of varied thicknesses

Authors: Edwards, P. D.¹; Ramulu, M.²

Source: Science and Technology of Welding & Joining, Volume 14, Number 5, July 2009 , pp. 476-483(8)

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Abstract:

Friction stir welding of titanium alloy (Ti–6Al–4V) was demonstrated on 3, 6, 9 and 12 mm thickness square groove butt joints. Complete microstructural and microhardness evaluations were conducted in addition to surface and subsurface examinations for each case. The 3 mm welds exhibited an extremely fine grained microstructure with evidence of processing temperatures below the beta transus temperature of the alloy. The 6, 9 and 12 mm samples possessed larger grains formed by a slower cooling rate from above the beta transus temperatures. The thick section weld exhibited a nearly uniform microhardness, while the thinner welds showed a slight, 6%, increase in hardness compared with the parent material.

Keywords: FRICTION STIR WELDING; MICROSTRUCTURE; MICROHARDNESS; TITANIUM

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/136217109X425838

Affiliations: 1: University of Washington, Seattle, WA, USA; The Boeing Company, Seattle, WA, USA 2: University of Washington, Seattle, WA, USA

Publication date: 2009-07-01

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