Control of Weld Residual Stress in a Thin Steel Plate through Low Transformation Temperature Welding Consumables

Wu, Xin; Wang, Zhifen; Yu, Zhenzhen; Liu, Stephen; Bunn, Jeffrey R.; Kolbus, Lindsay; Feng, Zhili

doi:10.29391/2020.99.012

Title: Control of Weld Residual Stress in a Thin Steel Plate through Low Transformation Temperature Welding Consumables

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Abstract

Low transformation temperature welding (LTTW) consumables are characterized by a low martensite start temperature and a large fraction of martensite forming in the weld. It can efficiently reduce the tensile residual stress because the volume expansion associated with the martensitic transformation compensates for the thermal contraction during cooling. In this work, a LTTW wire, designated as EH200B, was created for the arc welding of advanced high-strength steel thin plates. In comparison to conventional ER70S-3 wires, this LTTW wire generated an opposite distortion pattern. Neutron diffraction measurements along the center thickness of the welded plates showed the maximum residual stress along the longitudinal direction (LD) in the weld region, and the heat-affected zone (HAZ) immediately adjacent to the weld region was reduced from ~330 MPa to below 240 MPa by using the LTTW wire. A finite element (FE) model was developed to predict the residual stress distributions of the plates welded under these two wires. The simulation results showed reasonable agreement with the volume-average neutron diffraction data. Compressive residual stress in the weld region using the LTTW wire was predicted by the FE method. Electron backscattered diffraction and x-ray diffraction measurements confirmed ~90% martensite was present in the LTTW weld. Themore »« less

Authors:

Wu, Xin ^[1]; Wang, Zhifen ^[1]; Yu, Zhenzhen ^[1]; Liu, Stephen ^[1];

^[2]; Kolbus, Lindsay ^[2];

^[2]

Colorado School of Mines, Golden, CO (United States). Dept. of Metallurgical and Materials Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: 2020-04-01

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

OSTI Identifier:: 1809967

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Welding Journal

Additional Journal Information:: Journal Volume: 99; Journal Issue: 4; Journal ID: ISSN 0043-2296

Publisher:: American Welding Society

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING; 36 MATERIALS SCIENCE; Low Transformation Temperature Welding Consumables; Gas Metal Arc Welding; Weld Residual Stress; Neutron Diffraction; Numerical Simulation

Citation Formats


                    Wu, Xin, Wang, Zhifen, Yu, Zhenzhen, Liu, Stephen, Bunn, Jeffrey R., Kolbus, Lindsay, and Feng, Zhili. Control of Weld Residual Stress in a Thin Steel Plate through Low Transformation Temperature Welding Consumables.  United States: N. p., 2020. 
Web.  doi:10.29391/2020.99.012.

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                    Wu, Xin, Wang, Zhifen, Yu, Zhenzhen, Liu, Stephen, Bunn, Jeffrey R., Kolbus, Lindsay, & Feng, Zhili. Control of Weld Residual Stress in a Thin Steel Plate through Low Transformation Temperature Welding Consumables.  United States.  https://doi.org/10.29391/2020.99.012

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                    Wu, Xin, Wang, Zhifen, Yu, Zhenzhen, Liu, Stephen, Bunn, Jeffrey R., Kolbus, Lindsay, and Feng, Zhili. Wed .  
"Control of Weld Residual Stress in a Thin Steel Plate through Low Transformation Temperature Welding Consumables".  United States.  https://doi.org/10.29391/2020.99.012.  https://www.osti.gov/servlets/purl/1809967.

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@article{osti_1809967,

  title        = {Control of Weld Residual Stress in a Thin Steel Plate through Low Transformation Temperature Welding Consumables},

  author       = {Wu, Xin and Wang, Zhifen and Yu, Zhenzhen and Liu, Stephen and Bunn, Jeffrey R. and Kolbus, Lindsay and Feng, Zhili},

  abstractNote = {Low transformation temperature welding (LTTW) consumables are characterized by a low martensite start temperature and a large fraction of martensite forming in the weld. It can efficiently reduce the tensile residual stress because the volume expansion associated with the martensitic transformation compensates for the thermal contraction during cooling. In this work, a LTTW wire, designated as EH200B, was created for the arc welding of advanced high-strength steel thin plates. In comparison to conventional ER70S-3 wires, this LTTW wire generated an opposite distortion pattern. Neutron diffraction measurements along the center thickness of the welded plates showed the maximum residual stress along the longitudinal direction (LD) in the weld region, and the heat-affected zone (HAZ) immediately adjacent to the weld region was reduced from ~330 MPa to below 240 MPa by using the LTTW wire. A finite element (FE) model was developed to predict the residual stress distributions of the plates welded under these two wires. The simulation results showed reasonable agreement with the volume-average neutron diffraction data. Compressive residual stress in the weld region using the LTTW wire was predicted by the FE method. Electron backscattered diffraction and x-ray diffraction measurements confirmed ~90% martensite was present in the LTTW weld. The fatigue life of DP980 steel lap joint panels using EH200B wire nearly doubled that of ER70S-3 wire. This improvement was attributed to the high strength and low LD residual stress in the weld and HAZ immediately adjacent to the weld.},

  doi          = {10.29391/2020.99.012},

  journal      = {Welding Journal},

  number       = 4,

  volume       = 99,

  place        = {United States},

  year         = {2020},

  month        = {4}

}

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