Resistance spot welding macro characteristics of the dissimilar thickness dual phase steels

Zhang, Hongqiang; Qiu, Xiaoming; Yang, Bai; Xing, Fei; Yu, Huihui; Shi, Yanan

doi:10.1016/j.matdes.2014.05.060

Cited by 36 publications

(16 citation statements)

References 18 publications

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“…HAZ softening was previously reported for the welding of DP steels with various processes . The extent of softening was found to be proportional to the welding heat input, volume fraction of martensite in DP steel and steel chemistry …”

Section: Resultsmentioning

confidence: 55%

“…Welding, as the most essential joining technique in the automotive industry, plays a significant role in determining the final mechanical properties of DP steel sheets . Most automotive components are welded using resistance spot welding (RSW) . However, joining of blanks before stamping process also has been performed using laser welding (LW) .…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Microstructure and Tensile Properties of Dual Phase Steel Welded Using Friction Stir Welding and Gas Tungsten Arc Welding

Ashrafi

Shamanian

Emadi

et al. 2018

steel research int.

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In the present research, a comparative study on influence of friction stir welding (FSW) and gas tungsten arc welding (GTAW) processes on the microstructure and tensile properties of dual phase steel welds is carried out. The results indicate that the microstructure of weld metal and inner part of the heat affected zone (HAZ) in the GTA welded sample is composed of coarse bainite, Widmanestatten ferrite and ferrite–carbide (FC) aggregate. The sample welded by FSW exhibits the formation of fine ferrite, FC aggregate, and bainite in the weld nugget and inner part of the HAZ. Microhardness measurements reveal the formation of a softened zone in the subcritical area of the HAZ due to the tempering of the pre‐existing martensite. Both joints show lower tensile strength, tensile elongation and work hardening exponent compared to the base metal (BM), and fail in the softened HAZ during the uniaxial tensile test. However, the joint efficiency, work hardening rate and work hardening exponent of the sample welded by FSW are superior to those for the GTA welded sample. The predominant fracture mechanism for all samples is ductile with dimples on the fractured surfaces.

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Section: Resultsmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Comparison of Microstructure and Tensile Properties of Dual Phase Steel Welded Using Friction Stir Welding and Gas Tungsten Arc Welding

Ashrafi

Shamanian

Emadi

et al. 2018

steel research int.

View full text Add to dashboard Cite

show abstract

“…Expulsion occurs when the upper or lower electrode is of the R16 type, because of the increased current density within a small contact area, since this can create excessively high temperatures. The expulsion leads to the creation of diffuse indentation [8].…”

Section: Nugget Diametermentioning

confidence: 99%

Selection of electrode tips for the resistance spot welding of dissimilar stainless steels

Khuenkaew

Kanlayasiri

2018

MATEC Web Conf.

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This research sought to resolve the issue of electrode tip selection used in the resistance spot welding for two different stainless steel grades under otherwise identical welding parameters: SUS316 and SUS425. The study used a full fractional design in order to perform the analysis of the variables involved, while the quality of the weld was assessed by considering the indentation depth, penetration, and nugget diameter. The results of the study described the nugget diameter and penetration for all welds with the various different electrode tips which met the specified requirements of the customers. A single type of upper R30 and lower R30 electrodes achieved acceptable indentation depth. Ideally, good weld quality would demand a large nugget diameter, shallow indentation, and good penetration, all contribution to an acceptable overall appearance. Both R30 electrode tips are able to achieve the desired quality requirements in the spot welding process.

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“…The advanced high strength steels (AHSS) are used as part of the vehicle, which combine strength and ductility through the phase transformation induced by deformation and solid solution hardening, resulting in a good strength-weight relationship. The Dual Phase (DP) steel is one of the most common AHSS used in the industry due to its good formability with relatively high strength, continuous performance followed by a rapid hardening, low yield ratio in tensile strain and non-aged behavior at room temperature [1].…”

Section: Introductionmentioning

confidence: 99%

Parameter Optimization: Force (F), Time (T) and Current Intensity (I), in the RSW Welding Process of DP-290 Steel Plates Using the Taguchi Method

et al. 2018

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Automotive industries are trying to use new light materials for structural parts of vehicles. However, the steels are being the best manufacturing material option in the automotive industry. One of the advanced steels commonly used due to the high mechanical properties is the Dual Phase Steel (Ferritic-Martensitic). Therefore, the welding process is still very important and a matter of improvement. The present work shows the design of an experimental matrix using the Taguchi method with the optimal parameters to apply in the spot welding process (RSW) of a DP-290 steel; the metallographic characterization, the microhardness and the Peel tests were also carried out in each specimen. The results determined that the lower intensity of current and a medium pressure for a longer time the better resistance to tearing, due to the microstructural changes in the specimens.

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Resistance spot welding macro characteristics of the dissimilar thickness dual phase steels

Cited by 36 publications

References 18 publications

Comparison of Microstructure and Tensile Properties of Dual Phase Steel Welded Using Friction Stir Welding and Gas Tungsten Arc Welding

Comparison of Microstructure and Tensile Properties of Dual Phase Steel Welded Using Friction Stir Welding and Gas Tungsten Arc Welding

Selection of electrode tips for the resistance spot welding of dissimilar stainless steels

Parameter Optimization: Force (F), Time (T) and Current Intensity (I), in the RSW Welding Process of DP-290 Steel Plates Using the Taguchi Method

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