Numerical sensitivity analysis of welding-induced residual stress depending on variations in continuous cooling transformation behavior

doi:10.1007/s11706-011-0131-7

Front Mater Sci

2011, Vol. 5

Issue (2) : 168-178 https://doi.org/10.1007/s11706-011-0131-7

RESEARCH ARTICLE

Numerical sensitivity analysis of welding-induced residual stress depending on variations in continuous cooling transformation behavior

C. HEINZE¹(

), C. SCHWENK¹, M. RETHMEIER¹, J. CARON²

1. Federal Institute for Materials Research and Testing, Division 5.5 “Safety of Joined Components”, Unter den Eichen 87, 12205 Berlin, Germany; 2. The Ohio State University, Welding Engineering Program, 1248 Arthur E. Adams Drive, Columbus, Ohio 43221, USA

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Abstract

The usage of continuous cooling transformation (CCT) diagrams in numerical welding simulations is state of the art. Nevertheless, specifications provide limits in chemical composition of materials which result in different CCT behavior and CCT diagrams, respectively. Therefore, it is necessary to analyze the influence of variations in CCT diagrams on the developing residual stresses. In the present paper, four CCT diagrams and their effect on numerical calculation of residual stresses are investigated for the widely used structural steel S355J2+N welded by the gas metal arc welding (GMAW) process. Rather than performing an arbitrary adjustment of CCT behavior, four justifiable data sets were used as input to the numerical calculation: data available in the Sysweld database, experimental data acquired through Gleeble dilatometry tests, and TTT/CCT predictions calculated from the JMatPro and Edison Welding Institute (EWI) Virtual Joining Portal software. The performed numerical analyses resulted in noticeable deviations in residual stresses considering the different CCT diagrams. Furthermore, possibilities to improve the prediction of distortions and residual stress based on CCT behavior are discussed.

Keywords welding simulation GMAW CCT sensitivity welding residual stress

Corresponding Author(s): HEINZE C.,Email:christoph.heinze@bam.de

Issue Date: 05 June 2011

Cite this article:

C. HEINZE,C. SCHWENK,M. RETHMEIER, et al. Numerical sensitivity analysis of welding-induced residual stress depending on variations in continuous cooling transformation behavior[J]. Front Mater Sci, 2011, 5(2): 168-178.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-011-0131-7
https://academic.hep.com.cn/foms/EN/Y2011/V5/I2/168

Tab.1 Nominal chemical composition of S355J2 plate material according to DIN EN 10025-2:2004

Tab.2 Specified minimum mechanical properties of S355J2 plate material according to DIN EN 10025-2:2004

Tab.3 Measured chemical composition of S355J2 plate material

Fig.1 Residual stress development along the welding direction, distance to weld centerline 8 mm, measured by X-ray diffraction, longitudinal and transverse residual stress, GMAW, plate thickness in 5 mm, net heat input approx. 1 kJ/mm.

Fig.2 Meshing of test plate geometry, nodes for support indicated.

Fig.3 CCT diagrams derived from Sysweld material database for S355J2 and from experimental Gleeble data.

Fig.4 CCT diagrams derived from different calculations based on the present chemical composition of the steel JMatPro and EWI (Virtual joining portal).

Tab.4 Calculated phase percentages for each CCT diagram, referring to a node with a peak temperature of 1300°C and = 28 s

Fig.5 Numerically calculated residual stresses depending on neglect or consideration of large deformations regarding the mechanical solution of the present welding simulation, longitudinal and transverse residual stress, GMAW, plate thickness 5 mm, net heat input approx. 1 kJ/mm.

Fig.6 Comparison of experimentally determined and numerically calculated residual stresses along the welding direction in a distance of 8 mm to the weld centerline, longitudinal and transverse residual stress, Sysweld CCT diagram applied, GMAW, plate thickness 5 mm, net heat input approx. 1 kJ/mm.

Fig.7 Comparison of experimentally determined and numerically calculated residual stresses, Influence of different CCT diagrams on the calculated longitudinal residual stress, GMAW, plate thickness 5 m, net heat input approx. 1 kJ/mm.

Fig.8 Comparison of experimentally determined and numerically calculated residual stresses, Influence of different CCT diagrams on the calculated transverse residual stress, GMAW, plate thickness 5 m, net heat input approx. 1 kJ/mm.

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