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2000 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis

Abstract [en] : The most frequent used method for joining metal structures together is fusion welding. This method has largely been developed by experiments, i.e. trial and error. The problem of distortion, residual stresses and reduced strength of a structure in and around a welded joint are a major concern of the welding industry, especially in the aerospace industry where safety and economy are important issues. The objective of this thesis is to develop and evaluate a method for introducing a moving heat source into a FE-model. The heat source should be able to move along any general 3D curve. The aim is to facilitate the simulation of welding for complex weld paths and geometries. The basic idea is that the user defines the weld path in a CAD-program with the geometry as basis, then information about the weld path is to be exported to a separate file. This file is processed later in the FE-program by user-defined routines in order to create nodal heat input corresponding to the weld for the finite element model. The aim of this work has in general been fulfilled. The method for welding simulation that can follow any general 3-D curve as welding path fulfils the expectations perfectly. In the whole process of welding simulation there are a couple of things that must be added or corrected. One of these things is that this model gives no feed-back or verification if the correct amount of energy is given into the model. This may wary due to mesh and geometry changes. To be able to do simulations with adequate results this must of course be attended to. This simplification of the process of modelling welding will contribute to make simulations more commonly used by the industry.

Place, publisher, year, edition, pages: 2000.

Keyword [en] : Technology, welding, finite element method, FEM, heat source, I-DEAS, MARC

Keyword [sv] : Teknik

Identifiers: URN: urn:nbn:se:ltu:diva-47568ISRN: LTU-EX--00/072--SELocal ID: 5191fcd8-7f38-49f9-a70f-102b0d5f9b1bOAI: diva2:1020895

Subject / course: Student thesis, at least 30 credits

Educational program: Civil Engineering programmes 1997-2000, master's level

Examiners : Lindgren, Lars-Erik

Note: Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

Author: Lundbäck, Andreas



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