24162
2011
deu
lecture
0
--
--
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Simulation of Welding Temperature Field in Laser Beam Welding by Inverse Techniques
13th NOLAMP, Conference on Laser Materials Processing in the Nordic Countries
26792
13th NOLAMP, Conference on Laser Materials Processing in the Nordic Countries
Trondheim, Norway
2011-06-27
2011-06-29
Andreas Pittner
Weder Volltext-PDF noch papiergebundenes Belegexemplar vorhanden ("No Access")
Präsentation
24164
2011
eng
119
125
2
5
article
Springer
Secaucus, N.J.
0
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Simulation of inverse heat conduction problems in fusion welding with extended analytical heat source models
The paper presents bounded volume heat sources and the corresponding functional-analytical expressions for the temperature field. The power density distributions considered here are normal, exponential and parabolic. The sources model real heat sources like the welding arc, laser beam, electron beam, etc., the convection in the weld pool as well as the latent heat due to fusion and solidification. The parameters of the heat source models are unknown a priori and have to be evaluated by solving an inverse heat conduction problem. The functional-analytical technique for calculating 3D temperature fields in butt welding is developed. The proposed technique makes it possible to reduce considerably the total time for data input and solution. It is demonstrated with an example of laser beam welding of steel plates.
Frontiers of materials science
26794
10.1007/s11706-011-0137-1
2095-025X
2095-0268
Victor Karkhin
Andreas Pittner
Christopher Schwenk
Michael Rethmeier
eng
uncontrolled
Laser beam welding
eng
uncontrolled
Volume heat source
eng
uncontrolled
Functional-analytical solution
eng
uncontrolled
Inverse modelling
Verlagsliteratur
Volltext-PDF im Netzwerk der BAM verfügbar ("Closed Access")
24165
2011
eng
223
234
conferenceobject
Norwegian university of science and technology
0
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Simulation of the temperature field in laser beam welding by inverse technique
This paper presents volume heat sources and the corresponding functional analytical Solutions for the transient temperature field. The considered energy distributions are normal, exponential and parabolic. The method follows the common approach in Computational Welding Mechanics (CWM) to account for the physics of the welding process and the resulting temperature field by phenomenological models for heat conduction. Therefore, the used heat source models are apparent heat sources that incorporate the real heat input as well as the fluid flow in the weld pool and the latent heat connected with phase transformations. The heat source models provide welding characteristics like thermal cycle and Fusion line in the cross section within short computational time. Consequently, inverse techniques on basis of optimisation algorithms enable the adaptation of the models to the experimental data efficiently. Furthermore, the direct evaluation of the energy distribution for the experimental fusion line in the cross section is demonstrated which enhances the numerical optimisation by reducing the number of unknown model Parameters and providing a reasonable initial guess within the model parameter space. The proposed temperature field models are validated with real laser beam welding experiments.
13th Conference on laser materials processing in the nordic countries
26795
13th Conference on laser materials processing in the nordic countries
Trondheim, Norway
27.06.2011
29.06.2011
Victor Karkhin
Andreas Pittner
Christopher Schwenk
Michael Rethmeier
eng
uncontrolled
Volume heat source
eng
uncontrolled
Inverse modelling
eng
uncontrolled
Functional analysis
eng
uncontrolled
Laser beam welding
Volltext-PDF im Netzwerk der BAM verfügbar ("Closed Access")
Graue Literatur
23429
2011
deu
lecture
0
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Welding Simulation by Means of Phenomenological and Empirical Modelling
AnSim Workshop 2011
26008
AnSim Workshop 2011
Berlin, Germany
2011-03-23
2011-03-24
Andreas Pittner
Weder Volltext-PDF noch papiergebundenes Belegexemplar vorhanden ("No Access")
Präsentation