Experiments and simulations of post weld treatment with high frequency needle peening for welded joints

authored by: P. Schaumann, C. Keindorf
Abstract: This paper deals with fatigue tests on welded joints carried out in order to estimate the influence of a post weld treatment method called Ultrasonic Impact Treatment. With this method the fatigue resistance could be increased significantly. Furthermore, tubular joints of tripods were analysed with numerical simulations to judge these welded joints with the hot-spot-concept. The stress concentration factor for the treated weld toe geometry was determined numerically and compared to experimental results. In the next step numerical simulations were carried out for seam butt welds using an arc welding process followed by a process of UIT. The objective of these numerical investigations was to analyse the influence of residual stresses on the fatigue life for welded steel plates with and without post weld treatment. The fatigue life until crack initiation was calculated applying the notch strain approach. Both, experimental and numerical investigations attested a significant increase in fatigue resistance due to the post weld treatment by UIT compared to the as-welded condition.
Organisation(s): Institute of Steel Construction
Type: Article
Journal: Advanced steel construction
Volume: 5
Pages: 237-258
No. of pages: 22
ISSN: 1816-112X
Publication date: 09.2009
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Civil and Structural Engineering, Building and Construction, Mechanics of Materials, Mechanical Engineering

BibTeX

@article{8745dccc5916483681be25123211a406,
title = "Experiments and simulations of post weld treatment with high frequency needle peening for welded joints",
abstract = "This paper deals with fatigue tests on welded joints carried out in order to estimate the influence of a post weld treatment method called Ultrasonic Impact Treatment. With this method the fatigue resistance could be increased significantly. Furthermore, tubular joints of tripods were analysed with numerical simulations to judge these welded joints with the hot-spot-concept. The stress concentration factor for the treated weld toe geometry was determined numerically and compared to experimental results. In the next step numerical simulations were carried out for seam butt welds using an arc welding process followed by a process of UIT. The objective of these numerical investigations was to analyse the influence of residual stresses on the fatigue life for welded steel plates with and without post weld treatment. The fatigue life until crack initiation was calculated applying the notch strain approach. Both, experimental and numerical investigations attested a significant increase in fatigue resistance due to the post weld treatment by UIT compared to the as-welded condition.",
keywords = "Fatigue, Needle peening, Offshore, Post weld treatment, UIT, Welded joints, Wind energy",
author = "P. Schaumann and C. Keindorf",
year = "2009",
month = sep,
language = "English",
volume = "5",
pages = "237--258",
journal = "Advanced steel construction",
issn = "1816-112X",
publisher = "Hong Kong Institute of Steel Construction",
number = "3",
}