Author: Blom, Frederic J.

Source: Materials at High Temperatures, Volume 23, Numbers 3-4, August 2006 , pp. 283-289(7)

Publisher: Science Reviews 2000 Ltd

Abstract:

Welding of assemblies is often accompanied by an undesired amount of distortion. This results in increased costs for straightening or other repair activities. In order to understand and subsequently mitigate the effects of weld distortion in assemblies, a technique is developed to predict qualitative weld distortion by means of finite element techniques. The model is kept simple in order to limit the calculation times. Therefore, shell elements are used to model the plates in the assembly. The detailed information in the weld itself is therefore lost. However, the technique allows for faster calculation times on larger and more complex assemblies. By means of this technique transient deformation of the welding of an assembly can be visualised, which enhances insight into the problem. The influence of structural details or support functions can be shown to the designer. Weld distortion can then subsequently be minimised as a function of weld sequence. The model has been validated against various test-cases found in the open literature. These test-cases vary from simple T-branches to an assembled part of a ship hull. It has been shown that the modelling provides a good prediction of weld distortion as a function of welding sequence. The model distinguishes the distortion resulting from different welding sequences, thereby providing a fast simulation tool allowing the designer to minimise the total deformation.

Keywords: weld distortion; modelling; welded assemblies

Document Type: Research article

DOI: http://dx.doi.org/10.3184/096034006782739312

Affiliations: 1: NRG Petten, The Netherlands., Email: blom@nrg-nl.co

Publication date: 2006-08-15

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• Materials at High Temperatures serves the needs of those who develop and use materials for high temperature applications. It publishes peer reviewed contributions relating to high temperature applications in the power, chemical, engine, processing and furnace industries.

  The effects of high temperatures on corrosion, fatigue, creep, strength and wear in alloys, intermetallics, ceramics, refractories and composites are covered. Papers dealing with aspects of materials usage including modelling of behaviour and life prediction will be particularly welcome. The journal has a policy of emphasizing practical aspects and authors presenting results from research programmes are encouraged to relate these, if possible, to actual or potential applications.

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