Failure behavior of resistance spot welded advanced high strength steel: The role of surface condition and initial microstructure

Ghatei-Kalashami, A.; Zhang, S.; Shojaee, M.; Midawi, Abdelbaset R.H.; Goodwin, Frank; Zhou, Norman Y.

doi:10.1016/j.jmatprotec.2021.117370

Cited by 35 publications

(8 citation statements)

References 20 publications

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“…Moreover, the TSS values increased with heat input, which was attributed to the larger nugget diameter at higher heat input. Kalashami et al [33] and Parte et al [11] reported that larger nugget diameter can support higher bearing load. From figure 10, it can be seen that during the tensile shear test, there was a strain hardening in the lap shear configuration up to point 'A' (peak loading point).…”

Section: Tensile Shear Testmentioning

confidence: 99%

Examination on joining of 2 mm thick dissimilar stainless steel plates using resistance spot welding

Vignesh

2023

Eng. Res. Express

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In the present study, dissimilar metals such as austenitic stainless steel (ASS) and duplex stainless steel (DSS) with a thickness of 2 mm are joined by resistance spot welding process to investigate the welding metallurgy and failure behavior under different heat inputs. Non-uniform electrode impressions are observed on ASS and DSS sides due to their different thermal conductivity and electrical resistivity. The microstructure of the Fusion Zone (FZ) shows that higher heat input accelerates the growth of Intra Granular Austenite (IGA) due to faster cooling. Scanning electron microscopy (SEM) - Energy Dispersive X-ray (EDX) investigation at FZ showed that Chromium & Molybdenum decrease with increasing heat input due to a decrease in ferrite content. X-ray diffraction analysis confirmed that ferrite formation is limited at higher heat input. Microhardness study revealed that the higher hardness is in the middle of the weld nugget, which is due to the presence of equiaxed grains and IGA. The lowest hardness on the ASS side of Heat Affected Zone (HAZ) is due to the phenomenon of grain growth, and the HAZ DSS side has a higher hardness than DSS Base Metal (BM) due to the mechanism of solid solution strengthening. The tensile shear test showed that the tensile shear strength increases with the addition of heat. SEM Examination of the fracture surface revealed the presence of an equiaxed dimple structure on the ASS side, confirming ductile fracture, and torn bonds on the DSS side, confirming quasi-gap fracture due to the work-hardening ability of both plates. This study is carried out to understand the relationship between mechanical, metallurgical, and failure behaviours, because, researches on joining of dissimilar (AISI 316L and DSS 2205) stainless steel sheets using Resistance Spot Welding process is very limited and need to be studied in detail.

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Section: Tensile Shear Testmentioning

confidence: 99%

Examination on joining of 2 mm thick dissimilar stainless steel plates using resistance spot welding

Vignesh

2023

Eng. Res. Express

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“…Penggunaan metode pengelasan ini dalam proses penyambungan logam dengan ketebalan yang tipis untuk struktur manufaktur [4] khususnya dalam perakitan struktur seperti, mobil, truk, pesawat terbang, gerbong kereta apai, rata-rata diperlukan 4000 titik pengelasan [5]. Dengen penggunaan metode Resistance Spot Welding dapat mengurangi bobot kendaraan, mengoptimalkan keselamatan dan dapat menekan biaya produksi [6] [7].…”

Section: Pendahuluanunclassified

“…Proses Resistance Spot Welding menggunakan jenis sambungan lap join dimana dua atau lebih logam ditumpuk lalu dijepit dengan sepasang elektroda, pada waktu yang bersamaan dialirkan arus listrik yang mengakibatkan terjadinya resistensi pada titik logam [6], [8]. Dengan arus listrik yang cukup besar mengakibatkan pelelehan pada titik tekan elektroda dan membentuk nugget las [9] Secara umum terdapat beberapa parameter yang mempengaruhi hasil Resistance Spot Welding (RSW) adalah arus [10].…”

Section: Pendahuluanunclassified

The effect of variations in thickness of 2024 T42 aluminum plate on tensile strength and macrography in the process of resistance spot welding

Hendaryati

Mamungkas

Aisyah

et al. 2022

jttm

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Resistance Spot Welding merupakan metode pengelasan yang kompleks, yang melibatkan intraksi listrik, termal, mekanik, dan metalurgi. Dimana dalam prosesnya terdapat tiga parameter umum yang mempengaruhi Resistance Spot Welding arus listrik (welding current), tekanan elektroda (electrode force), dan siklus pengelasan. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh variasi ketebalan pada proses Resistance Spot Welding terhadap sifat fisis pada material Alumunium 2024 T42 dengan variasi ketebalan 0.5 + 1.2 + 0.6 mm, 0.8 + 0.6 + 1.0 mm, dan 0.8 + 1.2 + 1.2. Pengujian yang dilakukan yaitu uji tarik (tensile-shear test), dan uji macrography. Hasil pengujian dari setiap variasi ketebalan memenuhi standart AWS D17.2 dengan nilai lebih dari 140 lbf.

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“…However, when dissimilar metals are welded together, there is a risk of welding defects due to substantial variations in their physical and chemical properties. This can compromise the overall quality of the joints [6,7]. The process of RSW depends on the types of used materials and the specific welding parameters.…”

Section: Introductionmentioning

confidence: 99%

Clinching of High-Strength Steel Sheets with Local Preheating

et al. 2023

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Clinching is a manufacturing method of mechanically joining two or more materials without the use of heat or additional components. This process relies on high plastic deformation to create a secure bond. Clinching technology is widely used for joining materials of various grades and thicknesses. Especially in the automotive industry, clinching is an alternative to resistance spot welding. However, the load-bearing capacity of clinched joints is comparatively lower when compared to resistance spot-welded joints. This research aimed to increase the load-carrying capacity of clinched joints. To enhance the load-bearing capacity of the clinched joints, localized modification of the microstructure was carried out, primarily focusing on the neck area of the joint. The alteration of the microstructure within the clinched joint was accomplished through the application of localized heating using the resistance spot welding method. The microstructure distribution in the clinched joint region was analyzed using light and scanning electron microscopy, as well as microhardness measurements. Two material grades, micro-alloyed steel HX420LAD+Z and dual-phase ferritic–martensitic steel HCT600X+Z, were tested. Each grade underwent five groups of ten samples, which were subjected to identical experimental conditions of local heating by resistance spot welding (RSW) and clinching. The utilization of RSW on the clinched joint region resulted in an average enhancement of 17% in the load-carrying capacity for material HCT600X+Z, and an average increase of 25% for material HX420LAD+Z.

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Failure behavior of resistance spot welded advanced high strength steel: The role of surface condition and initial microstructure

Cited by 35 publications

References 20 publications

Examination on joining of 2 mm thick dissimilar stainless steel plates using resistance spot welding

Examination on joining of 2 mm thick dissimilar stainless steel plates using resistance spot welding

The effect of variations in thickness of 2024 T42 aluminum plate on tensile strength and macrography in the process of resistance spot welding

Clinching of High-Strength Steel Sheets with Local Preheating

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