Next Article in Journal
Interface Microstructure and Nanoindentation Characterization of Laser Offset Welded 5052 Aluminum to Press-Hardened Steel Using a Brass Interlayer
Previous Article in Journal
Parametric Analysis of Macro-Geometrical Deviations in Dry Turning of UNS A97075 (Al-Zn) Alloy
Previous Article in Special Issue
Fatigue Strength Enhancement of Butt Welds by Means of Shot Peening and Clean Blasting
Open AccessArticle

Evaluation of Heat Sources for the Simulation of the Temperature Distribution in Gas Metal Arc Welded Joints

Department of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, Italy
*
Author to whom correspondence should be addressed.
Metals 2019, 9(11), 1142; https://doi.org/10.3390/met9111142
Received: 13 September 2019 / Revised: 18 October 2019 / Accepted: 20 October 2019 / Published: 24 October 2019
(This article belongs to the Special Issue Modeling and Analysis of Residual Stress in Welded Joints)
Residual stresses can affect both the static strength and the fatigue endurance of welded joints. Residual stresses can be assessed by numerical simulation; however, the simulation of the welding process is a complex task that requires knowledge of several parameters, many of which can only be estimated with some uncertainty. The reduction in the number of these parameters can lead to a more feasible and efficient study. In this work, the finite element method is used to assess the capability of different thermal methods used to simulate a single pass of the gas metal arc welding process in reproducing the temperature distribution around the weld. Results of the simulations are compared to experimental measurements of the surface temperature close to the welding area. The thermal techniques analyzed adopt different levels of complexity, from the basic implementation of a constant initial temperature assigned to a given material volume, to the more comprehensive and widespread Goldak’s double-ellipsoid model. The study shows that, close to the weld seam, very similar thermal behaviors can be achieved by employing each one of the analyzed methods. Secondly, considering the constant initial temperature method, the comparison between experimental measurements and numerical simulations showed a fairly good agreement, suggesting that a relatively simple method (i.e., requiring the setting of only one parameter) can be used to efficiently reproduce the thermal history of a welding process. View Full-Text
Keywords: thermo-mechanical analysis; welded joints; constant initial temperature; element birth and death; Goldak’s double ellipsoid; numerical analysis; FE simulation; residual stress; steel; GMAW thermo-mechanical analysis; welded joints; constant initial temperature; element birth and death; Goldak’s double ellipsoid; numerical analysis; FE simulation; residual stress; steel; GMAW
Show Figures

Figure 1

MDPI and ACS Style

Chiocca, A.; Frendo, F.; Bertini, L. Evaluation of Heat Sources for the Simulation of the Temperature Distribution in Gas Metal Arc Welded Joints. Metals 2019, 9, 1142.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop