Mechanical Properties Laser Welding Automotive Steel Sheets

Líšková, Anna; Mihaliková, Mária; Dragošek, Lukáš; Kočiško, Róbert; Bidulský, Róbert

doi:10.12776/ams.v21i3.611

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…The latter leads to the formation of brittle intermetallic phases at the interface (especially steel-alloy Al joints and others), which cause weld cracking [5][6][7][8][9][10][11][12][13][14][15]. The solution lies mainly in the use of interlayers [16] and suitable filler materials [17,18], which mitigate chemical differences, in the modification of welding processes [19][20][21][22], as well as in the use of low heat input technologies, especially laser welding [23][24][25][26]. Low heat input means a thinner layer of intermetallic phases, less time for their growth and narrower HAZ.…”

Section: Introductionmentioning

confidence: 99%

Metallographic Study of Overlapped Laser Welds of Dissimilar Materials

Guzanová

Janoško

Draganovská

et al. 2022

Metals

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The paper deals with the metallographic analysis of overlapped laser welds of dissimilar materials based on galvanized and ungalvanized steels in various combinations. In addition to a gallery of metallographic sections, the paper presents the monitoring of weld defects, the measurement of selected weld geometrical characteristics and changes in weld microstructure by measuring the microhardness profile across the joint. The mixing of materials was monitored by area and line EDX analysis in the melting zone. Subsequently, the load carrying capacity of the formed joints was determined and compared with FEM simulation. Finally, the dependences of hardness and strength of welds on carbon content and carbon equivalent were determined.

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Section: Introductionmentioning

confidence: 99%

Metallographic Study of Overlapped Laser Welds of Dissimilar Materials

Guzanová

Janoško

Draganovská

et al. 2022

Metals

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“…Good strengths of the steels have been obtained, especially strengths of the cold-rolled steels were very high. cause serious aging problem of the sheet [6,12]. Since these IF steels were not deoxidized by aluminum or/and other elements, the oxygen content was rather high compared to industrial steel.…”

Section: Introductionmentioning

confidence: 99%

Strength and Microstructure of Cold-Rolled if Steel

Bui¹,

Le²

2016

Acta Metall Slovaca

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With the emerge of vacuum technology, it is possible to produce ultra low carbon (ULC) steels with carbon content of less than 0.005 %mass which is called interstitial free (IF) steels. In this study, strength and microstructure of IF steel after cold-rolling have been determined. The initial steel plates were cold-rolled using two different cold reductions (CR) as 80 and 90% in total, thereafter the steel sheets were cut into specimens for tensile test and optical microscopy. Ultimate tensile strength (UTS) of the cold-rolled steel was high (650807 MPa), but the elongation (EL) was low (3.55.3%). Meanwhile, UTS of the annealed steels was decreased to 290 MPa when soaking temperature was 800 o C because of stress relief and recrystallization. It was concluded that higher CR (more severe deformation) increased the strength but decreased the ductility of the IF steels. In consistence with micrograph of the steels, X-ray diffraction (XRD) results showed that microstructure of the cold-rolled and annealed IF steels was only ferrite. Textures, one of the most important factors affecting the recrystallization, were found in cold-rolled steels. Keywords:Cold reduction, Cold-rolling, IF steel, Residual stress, Texture IntroductionThe demands for the steel with excellence formability from automotive industry have accelerated the progress in the steelmaking process, leading to the development of the ultra low carbon (ULC) steels containing carbon less than 0.01 %mass [1,2]. With the emerge of vacuum technology, it is possible to produce ULC steels with carbon content of less than 0.005 %mass which is called interstitial free (IF) steels [3][4][5][6]. It is well known that the interstitial elements such as carbon (C) and nitrogen (N) in the steel are lower owing to vacuum treatment, thereafter one of the most important properties of ULC steel (formability) is improved to apply for automotive body. In general, two important objectives being pursued by the automobile industry are a decrease in car weight and improvements in safety [7]. To realize these requirements, several researches have been implemented to reduce thickness of the steel sheet, increase strength and improve press formability of the steel. For example, J. Galan et al. studied on improving strength and dent resistant capacities with bake hardenable ULC steels in order to fulfill the requirements of thinner sheet steel for automotive applications [2]. M. Wang et al. analyzed the source and disadvantages of macro-inclusions in titanium stabilized ULC steel and reported that the total

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Mechanical Properties Laser Welding Automotive Steel Sheets

Cited by 2 publications

References 12 publications

Metallographic Study of Overlapped Laser Welds of Dissimilar Materials

Metallographic Study of Overlapped Laser Welds of Dissimilar Materials

Strength and Microstructure of Cold-Rolled if Steel

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