Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
A new innovative toolbox for lean welding of fatigue loaded structures
University West, Department of Engineering Science, Research Environment Production Technology West. Volvo Construction Equipment, Carl Lihnells väg, Braås, Sweden . (PTW)
2015 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 81, no 1-4, 635-643 p.Article in journal (Refereed) Published
Abstract [en]

Welding is a key manufacturing technology in the production of heavy steel structures, but it is likewise a weak link in the production chain since fatigue fractures in welds is a common cause of failures. This paper proposes several changes in the process to make the manufacturing more efficient and to improve the fatigue properties. The idea is to adopt the weld quality demands for the purpose of the weld and to connect them to the welding procedures. This approach ensures that the primary focus during welding is at the critical characteristics which add value to the welded structure through an enhanced fatigue life. These fatigue life-critical properties have been found to be related to the local weld geometry in the weld toe and at the weld root. Traditional demands related to the good workmanship of welding can often be neglected, due to its limited effect to the fatigue life. The research presented in this paper has contributed to the development of welding procedures for improved fatigue life properties at the critical points of the weld. Results indicate a considerable potential for enhanced fatigue life of fillet welds. The idea is to replace the standard fillet welds with a new toolbox containing three different welds: (i) welds with optimized penetration, (ii) welds with optimized weld toe, and (iii) welds with a low cost. Right usage of these weld types contributes to an efficient production that offer a long fatigue life. This paper describes a holistic view of the subject and highlights issues with the traditional way of working. The challenge and the novelty in the paper are the connection between the welding process, weld demands, and fatigue life properties. This connection is necessary for the development of welding procedures that can contribute to the fabrication of weight optimized welded structures with a predictable life. © 2015 Springer-Verlag London

Place, publisher, year, edition, pages
2015. Vol. 81, no 1-4, 635-643 p.
Keyword [en]
Fatigue of materials, Joints (structural components), Manufacture, Structural properties, Welding, Critical properties, Enhanced fatigue lives, Fatigue properties, Fatigue strength, Fillet welds, Manufacturing technologies, Welded structures, Welding procedures, Welds
National Category
Other Mechanical Engineering
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-7617DOI: 10.1007/s00170-015-7183-2ISI: 000361629900053Scopus ID: 2-s2.0-84942364679OAI: oai:DiVA.org:hv-7617DiVA: diva2:815903
Note

Date: 12 May 2015           

Available from: 2015-06-02 Created: 2015-05-30 Last updated: 2016-05-02Bibliographically approved
In thesis
1. A Framework for optimised welding of fatigue loaded structures: Applied to gas metal arc welding of fillet welds
Open this publication in new window or tab >>A Framework for optimised welding of fatigue loaded structures: Applied to gas metal arc welding of fillet welds
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Welding is a key process for heavy steel structures, but it is also a weak link in the structure since fatigue fractures in welds are a common cause of failure. This thesis proposes several changes in order to improve the fatigue properties in acost effective way, enabling reduced weight and reduced cost of welded structures. The main idea is to adapt the weld requirements and welding procedures to the load conditions of the weld. This approach ensures that the main focus in the welding process is the critical characteristics of the welds fatigue life properties. The fatigue life critical properties are most often related to the geometrical factors of the weld such as the radius at the weld toe or the penetration in the root. The thesis describes a holistic view of the subject and covers fatigue, weld quality, weld requirements and welding procedures. It becomes evident that the traditional way of working without a direct connection to fatigue is not the best. With an adaptation to the load conditions and fatigue, it is possible to enhance the fatigue life and reduce the welding cost. The main challenge is to connect the welding process, weld requirements and fatigue life properties. It is needed for an optimised welding process of heavy structures subjected to fatigue and toget a predictable fatigue life. Welds optimised for enhanced fatigue life properties are not necessary accepted according to the requirements in a current standard. Several welding procedures are proposed for improving the fatigue life properties of the weld, which indicate a high potential for enhanced fatigue lifeof fillet welds. The idea is to replace the "standard" fillet weld with three different weld types: (i) Welds with deep penetration, (ii) Welds with large weld toe radius and (iii) Welds produced with low cost. Together with customised requirements and reduced over-welding there is a vast potential for reduced weight, reduced cost and increased productivity.The main contribution of this thesis work is the cross-functional studies including design, analysis, production and quality control. This gives a framework for improvements supporting reduced cost and reduced weight of VIII welded structures without reducing the fatigue strength. Many shortcomings have been highlighted to change the welding from a state where welds are done in a way as they "always" have, by tradition, to a more contemporary situation where weld requirements and welding procedures are actively chosen to match the load conditions of the weld. This result in requirements and welding procedures which actually are connected to the fatigue properties as defined by the loading conditions, and where auditors with high probability can say that an accepted weld actually is better than a rejected weld.

Place, publisher, year, edition, pages
Trollhättan: University West, 2016. 94 p.
Series
PhD Thesis: University West, 7
Keyword
GMAW, Fatigue, Welding procedures, Fillet welds, Weld quality
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
urn:nbn:se:hv:diva-9339 (URN)978-91-87531-26-2 (ISBN)978-91-87531-27-9 (ISBN)
Public defence
2016-05-31, C118, Trollhättan, 13:15 (English)
Opponent
Supervisors
Available from: 2016-05-04 Created: 2016-05-02 Last updated: 2016-10-31Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus
By organisation
Research Environment Production Technology West
In the same journal
The International Journal of Advanced Manufacturing Technology
Other Mechanical Engineering

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 102 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf