Accession Number:

AD0291400

Title:

A STUDY OF WELD HEAT-AFFECTED ZONES IN THE TITANIUM - 6A1-6V-2SN ALLOY

Descriptive Note:

Corporate Author:

WATERVLIET ARSENAL NY

Personal Author(s):

Report Date:

1962-09-01

Pagination or Media Count:

53.0

Abstract:

A new high-strength alpha-beta type titanium alloy was recently developed which is heat treatable to useful yield strengths above 180,000 psi, with 7 percent elongation, 16 percent reduction in area, and 7 ft.-ibs. Charpy V-notch impact energy at -40 F. Preliminary manual welding experience with this alloy disclosed a strong tendency for cracking in the heat-affected zone. This study was performed to determine resultant toughness in the heat affected zones for various welding conditions. Preheat was the most influential factor in retaining toughness in solution treated and aged base metal welding without it caused severe losses in impact strength and notched tensile strength which could not be recovered by aging treatments afterwards or resolution treating and aging. Mechanisms causing changes in properties involving beta becomes alpha and beta becomes alpha on cooling, and alpha becomes alpha beta and beta becomes alpha upon reheating were studies by X-ray diffraction volumetric analysis and photomicrographic techniques. No evidence of omega phase forming or transforming was found in the aging procedures studied.

Subject Categories:

  • Fabrication Metallurgy
  • Couplers, Fasteners and Joints

Distribution Statement:

APPROVED FOR PUBLIC RELEASE