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Title: Improving the mechanical properties of TIG welding Ti-6Al-4V by post weld heat treatment
Authors: Yan, Guangxu
Tan, Ming Jen
Crivoi, Alexandru
Li, Feng
Kumar, Sandeep
Chia, Nicholas Chern How
Keywords: TIG Welding
Mechanical Properties
Issue Date: 2017
Source: Yan, G., Tan, M. J., Crivoi, A., Li, F., Kumar, S., & Chia, N. C. H. (2017). Improving the mechanical properties of TIG welding Ti-6Al-4V by post weld heat treatment. Procedia Engineering, 207, 633-638.
Series/Report no.: Procedia Engineering
Abstract: After several years of service under high temperatures and high pressure, the Ti-6Al-4V aero-engine components may need to be repaired by Tungsten Inert Gas (TIG) welding to prevent crack growth. However, the material properties tend to worsen after TIG welding due to residual stresses developed adjacent to the fusion zone (FZ) and the heat affected zone (HAZ). It can lead to premature failure of the repair area resulting in a shortened service life of the components. Post weld heat treatment (PWHT) is generally adopted to reduce the residual stresses and to improve the mechanical properties. A comprehensive study of the effects of PWHT on the mechanical properties of Ti-6Al-4V was conducted in this paper. The residual stresses, micro-hardness, tensile strength and low cycle tensile fatigue life of as-welded Ti-6Al-4V before and after PWHT were compared and analyzed. The results indicate that the PWHT at 700 °C for 1 hour increases the yield strength of weld metal around 2.1% and improves the low cycle tensile fatigue life significantly under fatigue loads from 750 MPa to 950MPa by reducing residual stresses to close to 0 MPa.
ISSN: 1877-7058
DOI: 10.1016/j.proeng.2017.10.1033
Rights: © 2017 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles


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