Microstructure and Mechanical Properties of Resistance-Spot-Welded AISI-1008 Steel Lap Joints Using Multiwalled Carbon Nanotubes as an Interlayer

Das, Tanurup; Panda, Sushanta Kumar; Paul, Jinu

doi:10.1007/s11665-021-05687-3

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…RSW variables control the heat input between the sheets which, in turn, affects the growth and final size of the created WN. 27,49–51…”

Section: Resultsmentioning

confidence: 99%

“…The WN size is a fundamental and noticeable factor in the performance of the resistance spot welds. 27,49–51 WN size is controlled by the generated heat in the sheets’ interface during RSW. 25,57 The generated heat ( Q ) is also a function of the electrical resistance ( R ), welding current ( I ), and welding time ( t ) according to the Joule's equation that is in the form of equation (1) 25,57 : In general, three variables in RSW play a key role in the WN size: electrical resistance, welding current, and welding time.…”

Section: Discussionmentioning

confidence: 99%

“…RSW variables control the heat input between the sheets which, in turn, affects the growth and final size of the created WN. 27,[49][50][51] Tensile-shear behavior According to Figure 6(a), the tensile-shear strength and fracture energy increase with an increase in the welding current from 1 to 2 kA, while these are reduced by an increase in the welding current from 2 to 4 kA. On the other hand, the trend of the identical evolution is observed when the welding time is changed, as shown in Figure 6 strength and fracture energy improve through an increase in the welding time from 1 to 2 s and then decrease by increase in the welding time from 2 to 4 s.…”

Section: Microstructure Characterizationmentioning

confidence: 99%

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Microstructure and tensile-shear behavior of dissimilar resistance spot welds between 2304 duplex stainless steel and Inconel 718 superalloy

Badkoobeh

Mostaan

Rafiei

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Dissimilar joints between duplex stainless steels and nickel-based superalloys are of high significance in some industries. In this research, 2304 duplex stainless steel and Inconel 718 superalloy were welded by the resistance spot welding technique. The studies showed that the fusion zone microstructure was composed of a dendritic structure related to the grains of nickel-based solid solution ( γ-phase) and γ′ islands. The heat-affected zone microstructure of 2304 duplex stainless steel includes the austenite phase with a slight volume fraction and the ferrite phase with a high volume fraction. The austenite phase was formed with two morphologies of Widmanstätten and grain boundary allotriomorphs. The heat-affected zone microstructure of Inconel 718 superalloy also contained γ phase (nickel-based solid solution), annealing twins, and some precipitates. The results of the tensile-shear test revealed that tensile-shear strength (i.e. peak load) and fracture energy were increased by increasing the welding current from 1 to 2 kA and the welding time from 1 to 2 s. However, they were reduced by increasing the welding current from 2 to 4 kA and the welding time from 2 to 4 s. This was caused by the surface splash between the electrodes and the sheets. In the above-mentioned range, an increase in the welding current and time may also intensify the surface splash. It was also found that when the welding time was constant (i.e. 2 s), the spot weld obtained at the welding current of 1 kA failed by interfacial fracture mode. All spot welds obtained at the welding currents of 2, 3, and 4 kA failed by pull-out fracture mode. On the other hand, all spot welds associated with the welding times of 1, 2, 3, and 4 s failed by PF mode when the welding current was constant (i.e. 3 kA).

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“…RSW variables control the heat input between the sheets which, in turn, affects the growth and final size of the created WN. 27,49–51…”

Section: Resultsmentioning

confidence: 99%