Resistance spot weldability of galvannealed and bare DP600 steel

Kishore, Kaushal; Kumar, Pankaj; Mukhopadhyay, Goutam

doi:10.1016/j.jmatprotec.2019.04.005

Cited by 31 publications

(11 citation statements)

References 20 publications

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“…In the last stage of the statistical analysis, all the constructed models were verified on the set of testing data, assuming a cut-off point of 50%, where a confusion matrix was first constructed for each model (Table 1). (10) which corresponds to the percentage of zeros that were correctly predicted by the model;…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, much research is being conducted on the improvement of the spot-welding process of materials used in the automotive industry [ 7 , 8 , 9 ]. Kishore et al [ 10 ] compared the processes of welding for steel with and without a zinc coating and found that during the welding process, the coating on the surface of the steel reduces the diameter of the weld nugget. Soomro et al [ 11 ] proposed the use of double pulse resistance spot welding as a postweld heat treatment method that improves the mechanical properties of the spot weld.…”

Section: Introductionmentioning

confidence: 99%

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Correlation Tests of Ultrasonic Wave and Mechanical Parameters of Spot-Welded Joints

Ulbrich

Kańczurzewska

2022

Materials

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Resistance spot welding as the basic method of joining car body elements has been used in the automotive industry for many years. For these connections, it is required to obtain the appropriate diameter of the weld nugget, which results in a high strength and durability of the connection during vehicle operation. The article presents the methodology of testing spot-welded joints using both destructive methods: shearing test of the spot weld and the ultrasonic method. The main goals of the performed tests are (1) to determine the correlation between the mechanical strength of a joint, measured in kN, and the selected parameters of the ultrasonic longitudinal wave with a frequency of 20 MHz propagating in the area of the spot weld and (2) to build and verify the predictive models of the weld nugget quality. The correlation of these parameters allows assessing the strength of the connection with the use of a non-destructive test method. On the basis of the performed analyses, it was determined that there is a strongly positive correlation between the number of reverse echoes and the force necessary to destroy the spot weld (0.41) and the diameter of the weld nugget (0.50). A strong negative correlation was also obtained between the number of echoes and the strength (−0.69) and diameter of the weld nugget (−0.72).

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Correlation Tests of Ultrasonic Wave and Mechanical Parameters of Spot-Welded Joints

Ulbrich

Kańczurzewska

2022

Materials

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“…Figure 18c and d show diffracted crystallographic patterns with [101]α' and [200]γ phases. While high cooling rates cause high carbon content in the nugget zone to dissolve, carbide phases occur [30]. Cementite (Fe3C) and manganese carbide were discovered as welding parameters on microstructure and strength of DP800 steel joints using response surface methodology intermetallic precipitates in this diffracted pattern (Mn3C).…”

Section: Microstructural Analysis Using Temmentioning

confidence: 99%

The Effect of Resistance Spot Welding Parameters on Microstructure and Strength of DP800 Steel Joints Using Response Surface Methodology

Rajarajan¹,

Sonar²,

Sivaraj

et al. 2022

Advances in Materials Science

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The main objective of this paper is to analyze the direct and interaction effect of resistance spot welding (RSW) parameters on microstructure and strength of DP800 steel joints using response surface methodology (RSM). The DP800 steel sheets were spot welded in straight lap and cross lap joint configuration using RSW. The relationship between the RSW parameters, tensile shear fracture load (TSFL) and nugget zone hardness (NZH) was established employing statistical regression analysis and validated using Analysis of Variance (ANOVA). The DP800 steel joints made using welding current of 5.0 kA, electrode pressure of 4.0 MPa, and welding time of 1.50 s displayed maximum STRAIGHT-TSFL of 21.7 kN, CROSS-TSFL of 17.65 kN, and NZH of 589 HV0.5 respectively.

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“…There is a zone adjacent to the base metal which consisted of dual-phase microstructure of a-ferrite and martensite. This is called inter-critical heat-affected zone [9,10]. As the name suggests, it experiences a peak temperature in inter-critical zone where a phase mixture of austenite and ferrite is stable.…”

Section: Microstructure Across the Weldmentioning

confidence: 99%

Fatigue Fracture of Pie Channel Weld of Sinter Screen: A Metallurgical Insight

Kishore

Adhikary

Kumar

2020

J Fail. Anal. and Preven.

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Sintering is an agglomeration process to convert iron ore fines into a larger mass suitable to be charged directly into the blast furnaces. A screen separates the incoming iron ore raw materials based on their size fraction. These screens are supported by pie channels. One of these channels failed during operation that led to unwarranted interruption in production. Owing to the criticality of the matter, detailed failure investigation was conducted. It involved visual observations, micro-and macro-fractography to determine the mode of fracture, chemical analysis and microstructure examination using optical and scanning electron microscopes aided with energy-dispersive x-ray spectroscopy and electron probe microanalyzer. The analysis revealed incompatible austenitic stainlesssteel filler metal was used for welding mild steel material along with poor welding workmanship as suggested by underfilling and presence of thick layer of welding slag. There was formation of un-tempered martensite in dilution zone (the interface layer between heat-affected zone/fusion zone). The formation of undesirable martensite in the dilution zone is correlated with the time-temperature transformation diagram where the nose of the C-curve got significantly shifted toward the right due to enrichment with chromium and nickel as revealed by electron probe microanalysis. It was concluded that the failure occurred in fatigue mode due to deficiencies in welding and recommendations to prevent failures are also provided.

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Resistance spot weldability of galvannealed and bare DP600 steel

Cited by 31 publications

References 20 publications

Correlation Tests of Ultrasonic Wave and Mechanical Parameters of Spot-Welded Joints

Correlation Tests of Ultrasonic Wave and Mechanical Parameters of Spot-Welded Joints

The Effect of Resistance Spot Welding Parameters on Microstructure and Strength of DP800 Steel Joints Using Response Surface Methodology

Fatigue Fracture of Pie Channel Weld of Sinter Screen: A Metallurgical Insight

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