Spot Weldability Tests for High-Strength Steels

Sawhill, J M; Furr, S. T.

doi:10.4271/810352

Cited by 43 publications

(35 citation statements)

References 4 publications

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“…Generally, there are three measures for the quality evaluation of resistance spot welds, including physical weld attributes, mechanical properties, and failure mode [1,7,8]. Due to high alloying content of AHSS, which influences the heat generation during resistance spot welding, high alloying content increase the bulk resistivity of the metal, which leads to excessive heat at the interface and, therefore, suitable current range shifts to the lower current side.…”

Section: Introductionmentioning

confidence: 99%

Properties of Resistance Spot-Welded TWIP Steels

Zeytin

Emre

Kaçar

2017

Metals

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High manganese TWIP (twinning-induced plasticity) steels are particularly attractive for automotive applications because of their exceptional properties of strength combined with an excellent ductility. However, the microstructure and properties of TWIP steels are affected by excessive thermal cycles, such as welding and heat treatment. This paper deals with characterization and understanding the effect of welding current and time on the mechanical properties and microstructure of the resistance spot welded TWIP steel. For this purpose, weld nugget diameter was evaluated and the hardness, tensile shear strength of the weldment, and failure mode of samples were also determined. It has been found that the tensile shear strength of the samples increased with increasing welding current and welding time without expulsion, which reduces the strength of the weldment. Tensile shear samples failed by a partial interfacial fracture mode for low-heat input welds. The pullout fractures were observed with a sufficient heat input without expulsion.

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Section: Introductionmentioning

confidence: 99%

Properties of Resistance Spot-Welded TWIP Steels

Zeytin

Emre

Kaçar

2017

Metals

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“…Since the tensile fracture occurs in the base metal by necking for ductile steels, it is quite reasonable to assume that the static fracture load is somewhat related to the UTS (ultimate tensile stress) of the base sheet metal. Sawhill and Furr [14] tested spot welded specimens made of a wide range of steel grades under monotonic loads. The ultimate tensile strength of the steels tested ranged from 276 MPa (40 ksi) to 483 MPa (70 ksi), e.g.…”

Section: Issues Related To Steel Grades Geometry and Loading Mode Ofmentioning

confidence: 99%

Dynamic Separation of Resistance Spot Welded Joints: Part II—Analysis of Test Results and a Model

et al. 2009

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The ultimate strength of resistance spot welded joints fabricated from a wide range of steel grades, weld button size, and sheet thickness are reported for lap-shear and cross-tension specimens subjected to quasi-static and impact loading conditions. Test data are analyzed with respect to energy, impact speed, and loading rate. Loading rate is identified as a critical, test system independent parameter to reflect the strain rate sensitivity of the steels. An equation is fitted to the ultimate strength test data as a function of loading rate which is proposed to predict the separation of spot welded joint under dynamic loading. The model is validated by test data from open literature generated from other type of specimens and/or dynamic test conditions.

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“…To increase the weight-to-strength ratio, new materials such as high strength aluminum alloys and the so-called Advanced High Strength Steels (AHSS) are considered. Among the AHSS, the Dual Phase DP600 steel is found useful due its mechanical properties and formability (Sawhill and Furr 1981;Hoon et al 2008). Furthermore, the DP600 steel has shown a good weldability for resistance spot welding (Ferrasse et al 1998;Marya and Gayden 2005;Pedersen and Harthøj 2008).…”

Section: Introductionmentioning

confidence: 98%

3D modelling of plug failure in resistance spot welded shear-lab specimens (DP600-steel)

Nielsen

2008

Int J Fract

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Ductile plug failure of resistance spot welded shear-lab specimens is studied by full 3D finite element analysis, using an elastic-viscoplastic constitutive relation that accounts for nucleation and growth of microvoids to coalescence (The Gurson model). Tensile properties and damage parameters are based on uni-axial tensile testing of the basis material, while the modelled tensile response of the shear-lab specimens is compared to experimental results for the case of a ductile failure near the heat affected zone (HAZ). A parametric study for a range of weld diameters is carried out, which makes it possible to numerically relate the weld diameter to the tensile shear force (TSF) and the associated displacement, u T SF , respectively. Main focus in the paper is on modelling the localization of plastic flow and the corresponding damage development in the vicinity of the spot weld, near the HAZ. For decreasing weld diameter, localization of plastic flow may be observed to occur in the weld nugget, introducing significant shearing. Due to these competing mechanisms a critical transition radius of the weld may be found. However, due to the limitation of the Gurson model in describing ductile failure at very low stress triaxiality, further analysis of the shear failure is omitted.

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Spot Weldability Tests for High-Strength Steels

Cited by 43 publications

References 4 publications

Properties of Resistance Spot-Welded TWIP Steels

Properties of Resistance Spot-Welded TWIP Steels

Dynamic Separation of Resistance Spot Welded Joints: Part II—Analysis of Test Results and a Model

3D modelling of plug failure in resistance spot welded shear-lab specimens (DP600-steel)

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