Supercritical area and critical nugget diameter for liquid metal embrittlement of Zn-coated twining induced plasticity steels

Ashiri, Rouholah; Haque, A.; Ji, Changwook; Shamanian, M.; Salimijazi, Hamidreza; Park, Yeong-Do

doi:10.1016/j.scriptamat.2015.07.006

Cited by 116 publications

(40 citation statements)

References 21 publications

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“…Similar observations have been reported by Ashiri et al, and this area was termed as the supercritical area for LME (Ref. 13). Location C was not only subjected to high temperature and thermal stress, but also exhibited higher t LZ and t TS .…”

Section: Fig 15 -The Formation Of Large Type-a Lme Cracks In the Cesupporting

confidence: 85%

“…As reported by previous researchers, LME cracks in RSW are formed because of thermal-mechanical conditions that prevail during RSW (Refs. 13,17,18). As a result, it is important to investigate the temperature and stress distribu- tion at different crack locations.…”

Section: Temperature and Stress Distribution At Various Locationsmentioning

confidence: 99%

“…In RSW, LME cracks can significantly deteriorate the spot weldability of Zn-coated AHSS (Refs. [11][12][13][14][15][16]. The zinc coating in steels melts at a relatively lower temperature (420°C) to produce liquid zinc at the sheet surface during RSW.…”

Section: Introductionmentioning

confidence: 99%

“…The melting of zinc along with the presence of high tensile stress generated during the thermomechanical welding cycle lead to the penetration of liquid zinc into the steel matrix, causing LME (Refs. 13,17,18). As the LME crack can affect the mechanical performances of the spot welds, these cracks need to be eliminated.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Four Types of LME Cracks in RSW of Zn-Coated AHSS

Murugan¹,

Park²,

Vijayan³

et al. 2020

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Section: Fig 15 -The Formation Of Large Type-a Lme Cracks In the Cesupporting

confidence: 85%

Section: Temperature and Stress Distribution At Various Locationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Four Types of LME Cracks in RSW of Zn-Coated AHSS

Murugan¹,

Park²,

Vijayan³

et al. 2020

Self Cite

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show abstract

“…In the literature, finite element methods have been frequently used to study RSW processes in great detail [14]. To resolve the inter-dependency of electric flow, thermal heating and mechanical contacts, nonlinear electro-thermomechanical approaches are commonly chosen in either 2-or 3-dimensional formulations, depending on the studied phenomena: Huh et al [15] present a 3-dimensional thermo-electrical model with temperature dependent thermophysical, as well as electrical material data, to study the effect of different electrode shapes on nugget shapes and sizes.…”

Section: Introductionmentioning

confidence: 99%

Investigation of liquid metal embrittlement of dual phase steel joints by electro-thermomechanical spot-welding simulation

Frei

Biegler

Rethmeier

et al. 2019

Science and Technology of Welding and Joining

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A 3D electro-thermomechanical model is established in order to investigate liquid metal embrittlement. After calibration to a dual phase steel of the 1000 MPa tensile strength class, it is used to analyse the thermo-mechanical system of an experimental procedure to enforce liquid metal embrittlement during resistance spot welding. In this procedure, a tensile stress level is applied to zinc coated advanced high strength steel samples during welding. Thereby, liquid metal embrittlement formation is enforced, depending on the applied stress level and the selected material. The model is suitable to determine and visualise the corresponding underlying stresses and strains responsible for the occurrence of liquid metal embrittlement. Simulated local stresses and strains show good conformity with experimentally observed surface crack locations.

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Nugget Formation and Characterization of Effect of Cover Plate on the Formation of Solidification Defects in Resistance Spot Welding of Dissimilar Al6016/HC420LA Steel

et al. 2020

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Herein, 6016 aluminum alloy is joined to HC420LA high‐strength steel by resistance spot welding technology with two kinds of cover plates. The morphology and microstructure of the joint are observed by optical microscopy and scanning electron microscopy. The formation mechanism and control methods of solidification defects such as shrinkage cavities and cracks are discussed. The results show that independent nuggets form on aluminum alloy and high‐strength steel side, respectively, when two kinds of cover plates are added. In some special conditions, the aluminum/steel interface presents a double‐peak shape because of the imbalance between the stress from molten aluminum and that from applied force. Meanwhile, a large shrinkage cavity and longitudinal crack originate from the shrinkage cavity form in the nugget on the aluminum side. All these defects generate in the process of solidification, and a model is established to explain the formation mechanism of solidification defects. Moreover, the control methods to prevent the solidification defects are discussed. Based on the model and control methods, a good joint without solidification defects is produced.

show abstract

Supercritical area and critical nugget diameter for liquid metal embrittlement of Zn-coated twining induced plasticity steels

Cited by 116 publications

References 21 publications

Four Types of LME Cracks in RSW of Zn-Coated AHSS

Four Types of LME Cracks in RSW of Zn-Coated AHSS

Investigation of liquid metal embrittlement of dual phase steel joints by electro-thermomechanical spot-welding simulation

Nugget Formation and Characterization of Effect of Cover Plate on the Formation of Solidification Defects in Resistance Spot Welding of Dissimilar Al6016/HC420LA Steel

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