Weldability Evaluation and Microstructure Analysis of Resistance‐Spot‐Welded High‐Mn Steel in Automotive Application

Saha, Dulal Chandra; Han, Sangho; Chin, Kwang‐Geun; Choi, In Soo; Park, Yeong-Do

doi:10.1002/srin.201100324

Cited by 59 publications

(68 citation statements)

References 9 publications

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“…However, weldability of such steel has been poorly investigated. Due to insufficient knowledge available regarding the resistance spot weldability of TWIP steel, it is still not widely accepted by automobile industries [9]. In this work, the effects of welding parameters, such as welding current and welding time, on the mechanical properties and metallurgical characterization of spot-welded high Mn and Al (32% Mn, 3.16% Al) TWIP steel in 1 mm thickness is investigated in detail.…”

Section: Methodsmentioning

confidence: 99%

“…The results also confirm that weld nugget size clearly increased with increasing heat input up to a critical level. Increasing welding current and welding time causes enhancement of heat input which, in turn, increases the extent of the nugget size of the weldment [9,[33][34][35].…”

Section: Effect Of Welding Parameters On Weld Nugget Size Strength mentioning

confidence: 99%

“…Since the HAZ has been heated up to temperature approaching the solidus temperature of the alloy, the grain growth is present and many of the second-phase particles, which might also be present in the base metal, may dissolve. This can lead to a super-saturation of the austenite matrix during cooling [9]. The microstructure of the TWIP steel is decorated with equiaxed austenite grains as seen in Figure 7d.…”

Section: Microstructure Evaluation Of Weldmentmentioning

confidence: 99%

“…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. The failure mode of spot welded AHSS's are often the interfacial mode [9].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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: Methodsmentioning

confidence: 99%

Section: Effect Of Welding Parameters On Weld Nugget Size Strength mentioning

confidence: 99%

Section: Microstructure Evaluation Of Weldmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Properties of Resistance Spot-Welded TWIP Steels

Zeytin

Emre

Kaçar

2017

Metals

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Investigation on Resistance Spot Welding of TWIP Steel Sheets

Spena

Maddis

Lombardi

et al. 2015

steel research int.

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A widespread usage of new advanced high strength TWIP steels in the automotive industry is conditional on proper assembly operations by welding. Therefore, the effects of the main important process parameters on the mechanical and microstructural properties of resistance spot welded TWIP sheets are examined here. The welding parameters used were the welding current, clamping force, and welding time. An L‐9(33) orthogonally array was used to design the experimental tests. The mechanical response of the welded joints was assessed by tensile shear tests and Vickers microhardness measurements. The effects of the welding parameters on the fracture mode of the tensile shear specimens were also investigated. Some combinations of the welding process parameters guarantee acceptable tensile shear strengths for the automotive industry. The tensile shear samples mainly failed by interfacial fracture mode, while partial thickness with pull out fractures were observed in the samples when a high welding current and clamping force were used. Improper clamping force and welding current promoted excessive metal expulsions and, in turn, the formation of welding defects in the weld spots.

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Microstructural and Mechanical Characterization of Ti‐Containing Twinning‐Induced Plasticity Steel Welded Joint Produced by Gas Tungsten Arc Welding Process

Hernández-Belmontes

Mejı́a

Benito

et al. 2020

steel research int.

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The aim herein is to study the microstructural and mechanical changes generated in a welded joint of Ti‐containing twinning‐induced plasticity (TWIP) steel by the gas tungsten arc welding (GTAW) process. For this purpose, the welding parameters that allow the union of 5.6 mm‐thick butt plates with full penetration and without filler material are investigated. Microstructural changes are examined by light optical metallography. Segregation and second‐phase precipitated particles are investigated by scanning electron microscopy and electron‐dispersive spectroscopy. Phase transformations are evaluated using X‐ray diffraction. Finally, the mechanical behavior is assessed by Vickers microhardness and microtensile tests. In general, the welded joint shows dendritic structure formations in the fusion zone (FZ) and equiaxed grain growth in the heat‐affected zone (HAZ). The FZ shows a high degree of segregation, where Mn, Si, and C segregate in the interdendritic regions, whereas Al preferentially segregates in dendritic areas. In contrast, no effect on austenite stability is noticed. The welded joint shows an increase in microhardness, which is associated with the formation of precipitated particles. Finally, the microtensile results show a decrease in ultimate tensile strength (UTS) in the FZ, whereas the welding interface and HAZ show an increase in UTS compared with the base material.

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Weldability Evaluation and Microstructure Analysis of Resistance‐Spot‐Welded High‐Mn Steel in Automotive Application

Cited by 59 publications

References 9 publications

Properties of Resistance Spot-Welded TWIP Steels

Properties of Resistance Spot-Welded TWIP Steels

Investigation on Resistance Spot Welding of TWIP Steel Sheets

Microstructural and Mechanical Characterization of Ti‐Containing Twinning‐Induced Plasticity Steel Welded Joint Produced by Gas Tungsten Arc Welding Process

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