Surface modification methods for fatigue properties improvement of laser-beam-welded Ti-6Al-4V butt joints

Publikation: Beiträge in ZeitschriftenKonferenzaufsätze in FachzeitschriftenForschungbegutachtet

Authors

Surface and internal defects formed upon laser beam welding (LBW) have been recognized as a serious problem because they cause stress concentration leading to premature failure of a welded component. This paper seeks to remedy these weld imperfections by applying various post-weld treatments and analyzing their effect on the high cycle fatigue (HCF) performance of welded joints. High efficiency of laser-based post-processing techniques after welding such as laser surface remelting (LSR) and laser shock peening (LSP) was demonstrated and compared with conventional approaches. The study reveals that welding porosity determines the internal crack initiation of the surface-treated weldments. Influence of process parameters on porosity level and the HCF properties is presented in detail. Based on an extensive experimental study, practical guidelines needed to mitigate the notch effect from defects and to maximize the fatigue performance of the laser-welded Ti-6Al-4V butt joints are given.
OriginalspracheEnglisch
ZeitschriftProcedia Structural Integrity
Jahrgang13
Seiten (von - bis)273-278
Anzahl der Seiten6
ISSN2452-3216
DOIs
PublikationsstatusErschienen - 31.12.2018
Veranstaltung22nd European Conference on Fracture - ECF22: Loading and Environmental effects on Structural Integrity - Belgrade, Serbien
Dauer: 26.08.201831.08.2018
Konferenznummer: 22
http://www.ecf22.rs/

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