Proceedings of the 5th International Conference on Information Engineering for Mechanics and Materials

The residual stress distribution and fatigue property of TC4 laser-welded joint treated by laser shock peening

Authors
Ziwen Cao, Zhigang Che, Shikun Zou
Corresponding Author
Ziwen Cao
Available Online July 2015.
DOI
10.2991/icimm-15.2015.119How to use a DOI?
Keywords
Laser Shock Peening; Laser Welding; Compressive Residual Stress; Fatigue Life.
Abstract

The absence of highly tensile residual stress which distributed in laser welded joint is primary factor of decreasing fatigue life. Laser Shock Peening (LSP) experiments were conducted on TC4 laser welded joints of 2.5mm thickness, using circular laser spot with pulse duration of 10ns, laser power density of 7.2GW/cm2 and overlapping ratio of 37.5%. Surface residual stress distribution were studied under LSP of one layer, three layers and five layers. Surface tensile residual stresses converted to compressive residual stresses on LSP area, and compressive residual stresses along longitudinal direction were greater than along transverse direction. The amplitude of compressive residual stress were greatly relative to number of LSP layer. Fatigue life of specimens treated by three layers increased 50% in comparison to untreated specimens (maximum stress:750MPa, stress ratio:0.06). In a word, LSP could adjust residual stress field of laser welded joint, and it is an alternative technology to be potential to substantially improve fatigue performance.

Copyright
© 2015, the Authors. Published by Atlantis Press.
Open Access
This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Download article (PDF)

Volume Title
Proceedings of the 5th International Conference on Information Engineering for Mechanics and Materials
Series
Advances in Engineering Research
Publication Date
July 2015
ISBN
10.2991/icimm-15.2015.119
ISSN
2352-5401
DOI
10.2991/icimm-15.2015.119How to use a DOI?
Copyright
© 2015, the Authors. Published by Atlantis Press.
Open Access
This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Cite this article

TY  - CONF
AU  - Ziwen Cao
AU  - Zhigang Che
AU  - Shikun Zou
PY  - 2015/07
DA  - 2015/07
TI  - The residual stress distribution and fatigue property of TC4 laser-welded joint treated by laser shock peening
BT  - Proceedings of the 5th International Conference on Information Engineering for Mechanics and Materials
PB  - Atlantis Press
SP  - 631
EP  - 635
SN  - 2352-5401
UR  - https://doi.org/10.2991/icimm-15.2015.119
DO  - 10.2991/icimm-15.2015.119
ID  - Cao2015/07
ER  -