Numerical analysis of GTA welding process with emphasis on post-solidification phase transformation effects on residual stresses

B. Taljat; B. Radhakrishnan; T. Zacharia

doi:10.1016/s0921-5093(97)00729-6

Numerical analysis of GTA welding process with emphasis on post-solidification phase transformation effects on residual stresses

B. Taljat, B. Radhakrishnan, T. Zacharia

Multiscale Materials

Research output: Contribution to journal › Article › peer-review

164 Scopus citations

Abstract

The objective of this work was to analyze the residual stress state in spot welds made in an HY-100 steel disk by an autogenous gas tungsten arc (GTA) welding process. An uncoupled thermal-mechanical finite element (FE) model was developed that took into account the effects of liquid-to-solid and solid-state phase transformations. Effects of variations in mechanical properties due to solid-state phase transformations on residual stresses in the weld were studied. Extensive experimental testing was carried out to determine the mechanical properties of HY-100 steel. The residual stresses in the disk with the spot weld were measured by a neutron diffraction (ND) technique. The FE results are in good agreement with the ND measurements. The results show that the volumetric changes associated with the austenite to martensite phase transformation in HY-100 steel significantly affect residual stresses in the weld fusion zone and the heat affected zone.

Original language	English
Pages (from-to)	45-54
Number of pages	10
Journal	Materials Science and Engineering: A
Volume	246
Issue number	1-2
DOIs	https://doi.org/10.1016/s0921-5093(97)00729-6
State	Published - May 15 1998

Funding

The authors would like to thank Dr C.R. Hubbard and Dr X.L. Wang for reviewing the paper. The research was sponsored in part by an appointment to the Oak Ridge National Laboratory Postdoctoral Research Associates Program administered jointly by the Oak Ridge Institute for Science and Education and Oak Ridge National Laboratory. The research was also sponsored by the US Navy, Office of Naval Research, under interagency agreement DOE No. 1866-E126-A1, Navy No. N000014-92-F-0063 under US Department of Energy contract DE-AC05-96OR22464 with Lockheed Martin Energy Research Corporation.

Funders	Funder number
Lockheed Martin Energy Research Corporation
Oak Ridge National Laboratory
Office of Naval Research
U.S. Department of Energy	DE-AC05-96OR22464, 1866-E126-A1, N000014-92-F-0063
Oak Ridge National Laboratory
Oak Ridge Institute for Science and Education
U.S. Navy

Keywords

Finite element method
Gas tungsten arc
Neutron diffraction
Residual stress state

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10.1016/s0921-5093(97)00729-6

Cite this

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title = "Numerical analysis of GTA welding process with emphasis on post-solidification phase transformation effects on residual stresses",

abstract = "The objective of this work was to analyze the residual stress state in spot welds made in an HY-100 steel disk by an autogenous gas tungsten arc (GTA) welding process. An uncoupled thermal-mechanical finite element (FE) model was developed that took into account the effects of liquid-to-solid and solid-state phase transformations. Effects of variations in mechanical properties due to solid-state phase transformations on residual stresses in the weld were studied. Extensive experimental testing was carried out to determine the mechanical properties of HY-100 steel. The residual stresses in the disk with the spot weld were measured by a neutron diffraction (ND) technique. The FE results are in good agreement with the ND measurements. The results show that the volumetric changes associated with the austenite to martensite phase transformation in HY-100 steel significantly affect residual stresses in the weld fusion zone and the heat affected zone.",

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AU - Radhakrishnan, B.

AU - Zacharia, T.

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Y1 - 1998/5/15

N2 - The objective of this work was to analyze the residual stress state in spot welds made in an HY-100 steel disk by an autogenous gas tungsten arc (GTA) welding process. An uncoupled thermal-mechanical finite element (FE) model was developed that took into account the effects of liquid-to-solid and solid-state phase transformations. Effects of variations in mechanical properties due to solid-state phase transformations on residual stresses in the weld were studied. Extensive experimental testing was carried out to determine the mechanical properties of HY-100 steel. The residual stresses in the disk with the spot weld were measured by a neutron diffraction (ND) technique. The FE results are in good agreement with the ND measurements. The results show that the volumetric changes associated with the austenite to martensite phase transformation in HY-100 steel significantly affect residual stresses in the weld fusion zone and the heat affected zone.

AB - The objective of this work was to analyze the residual stress state in spot welds made in an HY-100 steel disk by an autogenous gas tungsten arc (GTA) welding process. An uncoupled thermal-mechanical finite element (FE) model was developed that took into account the effects of liquid-to-solid and solid-state phase transformations. Effects of variations in mechanical properties due to solid-state phase transformations on residual stresses in the weld were studied. Extensive experimental testing was carried out to determine the mechanical properties of HY-100 steel. The residual stresses in the disk with the spot weld were measured by a neutron diffraction (ND) technique. The FE results are in good agreement with the ND measurements. The results show that the volumetric changes associated with the austenite to martensite phase transformation in HY-100 steel significantly affect residual stresses in the weld fusion zone and the heat affected zone.

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KW - Gas tungsten arc

KW - Neutron diffraction

KW - Residual stress state

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Numerical analysis of GTA welding process with emphasis on post-solidification phase transformation effects on residual stresses

Abstract

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Keywords

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