Evaluation of Resistance Spot Weld Interfacial Fractures in Tensile-Shear Tests of TRIP 1180 Steels

Park, Sang‐Soon; Choi, Young-Min; Nam, Dae-Geun; Kim, Young-Seok; Yu, Jingkun; Park, Yeong-Do

doi:10.5781/kwjs.2008.26.6.081

Cited by 16 publications

(12 citation statements)

References 4 publications

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“…For example, Fig. 1 STS values of RSWed high-to ultra-high strength steels in similar [18, and dissimilar [12,23,25,36,38,43,50,78,79,82,87,96,98,100,101,115,119,125, joint configurations for the welding of a R m = 1500 MPa steel the same STS is required for the joint as for a R m = 1200 MPa steel grade (see also in Figs. 2 and 3).…”

Section: Equations To Predict the Shear Tension Strength 21 Different Sts Prediction Models Of The Literaturementioning

confidence: 99%

Prediction of the Shear Tension Strength of Resistance Spot Welded Thin Steel Sheets from High- to Ultrahigh Strength Range

Májlinger

Katula

Varbai

2021

Period. Polytech. Mech. Eng.

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The tensile strength of newly developed ultra-high strength steel grades is now above 1800 MPa, and even new steel grades are currently in development. One typical welding process to join thin steels sheets is resistance spot welding (RSW). Some standardized and not standardized formulas predict the minimal shear tension strength (STS) of RSWed joints, but those formulas are less and less accurate with the higher base materials strength. Therefore, in our current research, we investigated a significant amount of STS data of the professional literature and our own experiments and recommended a new formula to predict the STS of RSWed high strength steel joints. The proposed correlation gives a better prediction than the other formulas, not only in the ultra-high strength steel range but also in the lower steel strength domain.

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Section: Equations To Predict the Shear Tension Strength 21 Different Sts Prediction Models Of The Literaturementioning

confidence: 99%

Prediction of the Shear Tension Strength of Resistance Spot Welded Thin Steel Sheets from High- to Ultrahigh Strength Range

Májlinger

Katula

Varbai

2021

Period. Polytech. Mech. Eng.

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“…Park et al asserted that the acceptable welding region of high strength steel is narrow because of the expulsion that occurs in the range of high weld currents [7]. On the other hand, the Al-coated 22MnB5 contains a large amount of alloying elements such as Mn and Cr; this results in an increase in C eq , and the tensile strength after hot stamping increases to over 1,500 MPa.…”

Section: Introductionmentioning

confidence: 98%

“…In particular, it is known that interfacial fracture (IF), which is considered to be a failure in the weld of mild steel, is easily caused by hard and brittle martensite, which is formed in the weld because of the high carbon equivalent (C eq ) [6,7]. Although research on double impulse, post weld, and temper control has been conducted in order to solve this problem, these methods have restricted applicability in industrial fields [8,9].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of weldability for resistance spot welded single-lap joint between GA780DP and hot-stamped 22MnB5 steel sheets

et al. 2011

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Recently, in the automotive industry, Al-coated boron steel sheets (22MnB5) have been used for hot stamping, and the use of these sheets makes it possible to achieve a tensile strength of over 1,500 MPa, since a metallurgical transformation from austenite to martensite occurs during the process. In this study, resistance spot welding (RSW) experiments were performed in order to evaluate the weldability of single-lap joints between GA780DP and 22MnB5. The effect of the weld current on the nugget diameter and load-carrying capacity was evaluated by observing the nugget diameter and performing a tensile-shear test. Furthermore, the fracture behavior was evaluated by carrying out optical microscopy, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) observations. Ductile regions were observed on the interfacially fractured surface of the weld, and this implies that a high load-carrying capacity can be obtained even when interfacial fracture (IF) occurs. IF is caused by the stress concentration resulting from the presence of the sharp notch at the boundary of the nugget as well as by the high hardness and the brittle microstructure of the weld; the microstructure is brittle because of the high carbon equivalent (C eq ) and the penetration of Al in the weld.

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“…Park et al studied the resistance spot welding joints of high strength TRIP590 steel. The results exposed that fracture mode, and nugget diameter affects the weld joints fracture characteristics [11]. Stadler M et al carried out resistance spot welding on TRIP steel with bainitic ferrite by two pulses of current.…”

Section: Introductionmentioning

confidence: 99%

Effect of Silica Content on Mechanical and Microstructure Behaviour of Resistance Spot Welded Advanced Automotive TRIP Steels

Paranthaman¹,

Sundaram

Natrayan

2021

Silicon

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Evaluation of Resistance Spot Weld Interfacial Fractures in Tensile-Shear Tests of TRIP 1180 Steels

Cited by 16 publications

References 4 publications

Prediction of the Shear Tension Strength of Resistance Spot Welded Thin Steel Sheets from High- to Ultrahigh Strength Range

Prediction of the Shear Tension Strength of Resistance Spot Welded Thin Steel Sheets from High- to Ultrahigh Strength Range

Evaluation of weldability for resistance spot welded single-lap joint between GA780DP and hot-stamped 22MnB5 steel sheets

Effect of Silica Content on Mechanical and Microstructure Behaviour of Resistance Spot Welded Advanced Automotive TRIP Steels

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