Characteristics of the Resistance Spot Welding Joints in Dissimilar Thickness Dual-phase Steels

Liang, Jingwei; Zhang, Hongqiang; Qiu, Xiaoming; Shi, Yanan

doi:10.2355/isijinternational.isijint-2015-151

Cited by 7 publications

(2 citation statements)

References 15 publications

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“…The topographical results predicted the crack initiation at the softened zone and crack propagation through the periphery of the nugget to the base metal. These results were also accorded with the tear type failure and pull out failure in TSFL and CTSFL joints of the weld [16]. The fine-dimples characterized from figures 11(a), (d) indicates the presence of hard precipitates in the DP steel weldments.…”

Section: Fractography Studiessupporting

confidence: 78%

Microstructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α^/) steel joints

Rajarajan

Sivaraj

Balasubramanian

2020

Mater. Res. Express

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This research work focuses on production of sound weld by Resistance Spot Welding (RSW) process and correlate the mechanical properties of Dual Phase (DP) steel joints with its microstructural features. The main application of resistance spot welding was used to build white body assembly in automotive industry. The welded joint recorded maximum value of 21.3 kN in TSFL and 18.3 kN in CTSFL. The Scanning Electron Microscope (SEM) and Optical Microscope (OM) of the Nugget Zone (NZ) revealed lath/needle like microstructures with effect of severe cooling rate. The TEM microstructure exposed the formation of martensite (α / ) in the Nugget Zone (NZ) and tempered martensite (Tα / ) in Heat Affected Zone (HAZ), which accounts for superior joint strength of DP lap shear joints. Furthermore, crystallography studies reported the phase composition and crystallinity in weldments as cementite and magnesium carbide in [101] and [200] indices that accounts for high hardness of 584 Hv in the weldments.

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Section: Fractography Studiessupporting

confidence: 78%

Microstructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α^/) steel joints

Rajarajan

Sivaraj

Balasubramanian

2020

Mater. Res. Express

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“…Coherently with the literature about resistance spot welding [5,8,9,[30][31][32][33], there is a clear relationship between the shear strength and the nugget size of the Q&P/TRIP spot welds. In particular, shear strength increases as nugget diameter widens, Figure 6.…”

Section: Mechanical Properties Of Spot Weldsmentioning

confidence: 99%

Effects of Welding Parameters on Strength and Corrosion Behavior of Dissimilar Galvanized Q&P and TRIP Spot Welds

Spena

Rossi

Wurzer

2017

Metals

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This study investigates the effects of the main welding parameters on mechanical strength and corrosion behavior of galvanized quenching and partitioning and transformation induced plasticity spot welds, which are proposed to assemble advanced structural car elements for the automotive industry. Steel sheets have been welded with different current, clamping force, and welding time settings. The quality of the spot welds has been assessed through lap-shear and salt spray corrosion tests, also evaluating the effects of metal expulsion on strength and corrosion resistance of the joints. An energy dispersive spectrometry elemental mapping has been used to assess the damage of the galvanized zinc coating and the nature of the corrosive products. Welding current and time have the strongest influence on the shear strength of the spot welds, whereas clamping force is of minor importance. However, clamping force has the primary effect on avoiding expulsion of molten metal from the nugget during the joining process. Furthermore, clamping force has a beneficial influence on the corrosion resistance because it mainly hinders the permeation of the corrosive environment towards the spot welds. Although the welded samples can exhibit high shear strength also when a metal expulsion occurs, this phenomenon should be avoided because it enhances the damage and vaporization of the protective zinc coating.

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Effects of post-weld heat treatment on mechanical properties and microstructure of resistance spot–welded lightweight steel

Hwang

Cho

Nam

et al. 2019

Int J Adv Manuf Technol

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Characteristics of the Resistance Spot Welding Joints in Dissimilar Thickness Dual-phase Steels

Cited by 7 publications

References 15 publications

Microstructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α^/) steel joints

Microstructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α^/) steel joints

Effects of Welding Parameters on Strength and Corrosion Behavior of Dissimilar Galvanized Q&P and TRIP Spot Welds

Effects of post-weld heat treatment on mechanical properties and microstructure of resistance spot–welded lightweight steel

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Characteristics of the Resistance Spot Welding Joints in Dissimilar Thickness Dual-phase Steels

Cited by 7 publications

References 15 publications

Microstructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α/) steel joints

Microstructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α/) steel joints

Effects of Welding Parameters on Strength and Corrosion Behavior of Dissimilar Galvanized Q&P and TRIP Spot Welds

Effects of post-weld heat treatment on mechanical properties and microstructure of resistance spot–welded lightweight steel

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Microstructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α^/) steel joints

Microstructural analysis of weld nugget properties on resistance spot-welded advance high strength dual phase (α+α^/) steel joints