Effect of welding current on the microstructural evolution and lap-shear performance of resistance spot-welded 340BH steel

Pawar, Saurabh; Singh, Abhishek Kumar; Kiseong, Park; Choi, Shi‐Hoon

doi:10.1016/j.matchar.2023.113126

Cited by 6 publications

(1 citation statement)

References 44 publications

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“…BH steel plates are widely used in car bodies. Research has also been published on the welding characteristics of BH steel plates [15][16][17]. The degree of electrode wear has a non-negligible effect on the strength of resistance spot welded joints of BH steel plates.…”

Section: Introductionmentioning

confidence: 99%

Assessing Electrode Characteristics in Continuous Resistance Spot Welding of BH 340 Steel Based on Dynamic Resistance

Zhao,

Vdonin,

Slobodyan

et al. 2023

JMMP

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The aim of this investigation is to offer a data-based scheme for predicting electrode wear in resistance spot welding. One of the major factors affecting the mechanical properties of spot welds and the variation in weld quality is electrode wear and alloying. In this study, Rogowski coils and twisted pairs attached to the top and bottom electrodes were used to obtain the welding current and the voltage between the electrodes in the welding process, thereby calculating the dynamic resistance value during the welding process. The electrode tip diameter was obtained from the pressure exerted by the upper and lower electrodes on the carbon paper when the current was cut off and was regarded as an indicator of electrode wear. By continuously welding 0.5 mm thick BH 340 steel plates until the electrode failed, the dynamic resistance signal was recorded in real time. Simultaneously, the electrode diameter after every several welds was also recorded. On this basis, the correlation between electrode tip diameter and dynamic resistance is studied. In order to quantitatively study the mapping relationship between dynamic resistance and electrode wear, 10 characteristic values were extracted from the dynamic resistance, and the stepwise regression method was used to obtain the regression formula between the characteristic values and the electrode tip diameter. Using new data to verify the effectiveness of the regression model, the acquired results display that the maximum error between the predicted value of the electrode tip diameter and the measured value obtained by the regression equation with the interactive quadratic term is 0.3 mm, and the corresponding relative error is 7.69%. When welding with a new pair of electrodes, the maximum absolute error was 0.72 mm, and the relative error of the model prediction is within 20% according to the linear regression model with interaction terms. This indicates that this regression model is barely satisfactory for monitoring electrode condition.

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Section: Introductionmentioning

confidence: 99%

Assessing Electrode Characteristics in Continuous Resistance Spot Welding of BH 340 Steel Based on Dynamic Resistance

Zhao,

Vdonin,

Slobodyan

et al. 2023

JMMP

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Real‐Time Observation of Strain Evolution in Lap Shear Test of BH220 Steel Resistance Spot‐Welded Joints via a Digital Image Correlation Method

Zhao,

Guseinov,

Vdonin

et al. 2024

steel research int.

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This article presents an investigation of the real‐time deformation and strain field changes of baked hardening (BH) 220 steel plate resistance spot welds in the lap tensile shear tests via digital image correlation (DIC) technology. 2D DIC analysis can be used to provide a quantitative assessment of the strain competition between the weld nugget and the surrounding metal. The data obtained from the DIC technique indicate that the shear strain is primarily concentrated in the outer metal of the weld, consistent with a nugget pull‐out failure (PF) mode. In contrast, if the welding parameters are inappropriate, for example, if the welding current is 7.2 kA, the welding time is 10 cycles and the electrode pressure is 0.35 MPa, a significant shear strain appears in the nugget of the BH220 weld. This subsequently causes the weld to fail in an unfavorable interface failure mode in the shear test. Calculations show that if the failure mode is nugget pull‐out, the mean failure strength is 13.5 kN, while the value for interface failure is 6.55 kN. The PF mode is characterized by ductile failure, whereby the material yields and necks through the base material. This failure mode is not associated with the notch region.

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An investigation of the mechanical characteristics of BH 340 gas metal arc welded joints using digital image correlation technique and regression analysis

Zhao,

Guseinov,

Vdonin

2024

Int J Adv Manuf Technol

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Effect of welding current on the microstructural evolution and lap-shear performance of resistance spot-welded 340BH steel

Cited by 6 publications

References 44 publications

Assessing Electrode Characteristics in Continuous Resistance Spot Welding of BH 340 Steel Based on Dynamic Resistance

Assessing Electrode Characteristics in Continuous Resistance Spot Welding of BH 340 Steel Based on Dynamic Resistance

Real‐Time Observation of Strain Evolution in Lap Shear Test of BH220 Steel Resistance Spot‐Welded Joints via a Digital Image Correlation Method

An investigation of the mechanical characteristics of BH 340 gas metal arc welded joints using digital image correlation technique and regression analysis

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