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Influence of the Quality of Metal Sheet Edges After Strip Slitting Processes in Integrated Lines on the Quality of Laser Welds

Stańczyk Marcin

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 2

136--146

EN

This paper concerns issues related to the processes of sheet metal slitting and laser welding in technological lines. It includes a discussion of the industry needs and requirements for semi-finished products in the form of thin metal sheets. Furthermore, the basic technical solutions used in automatic strip slitting equipment and selected process parameters based on a specific material are described. The presented results were obtained on the basis of practical verification of the assumptions using newly designed devices implemented into production. The research material consisted of samples taken from S235JR sheet after strip slitting on an integrated slitting line and samples taken from a finished sideboard profile after laser welding. The welding process had been carried out using a CO2 laser, TruLaser Cell 1100, with a power of 4kW. Areas of a laser-welded joint were analysed for varied condition of the sheet edges at the production speed of 4m/min. Microscopic weld examination for the sheet edges without strains or burrs revealed a deep penetration at the level of 2355 µm, allowing to obtain a joint with a length of 1607 µm, a small heat-affected zone, and the correct structure. The paper shows possible problems and causes of their occurrence in industrial conditions.

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Analiza parametrów siłowych podczas rozdzielania pasma w rolkach rozdzielających w procesie walcowania

Mróz S.

Hutnik, Wiadomości Hutnicze

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2009

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Vol. 76, nr 7

491-493

PL

W pracy przedstawiono analizę zmian parametrów siłowych podczas dwużyłowego rozdzielania pasma w nienapędzanych rolkach rozdzielających (NRR). W rozwiązaniach teoretycznych procesu walcowania prętów z wzdłużnym rozdzielaniem pasma wykorzystano model matematyczny opisujący trójwymiarowe rozwiązanie zagadnień teorii plastyczności metodą elementów skończonych. Podział pasma na poszczególne żyły modelowano za pomocą programu komputerowego Forge3Ž, stosując algorytm usuwania elementów, w których została przekroczona krytyczna wartość pękania znormalizowanego kryterium Cockrofta-Lathama.

EN

Stress distributions during two-strand band separation process on idle rollers (ISR) are described in this paper. For the numerical modelling of strip slitting the Forge3Ž computer program was applied. The strip slitting in the simulation is implemented by the algorithm of removing elements in which the critical value of the normalized Cockroft-Latham criterion has been exceeded.

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Slitting criterion for various rolling speeds in MSR rolling process

Stefanik A.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 27, nr 1

91-94

EN

Purpose: The main idea of MSR technology is the capability of producing two, three, four and even five rods simultaneously from a single strip in a hot rolling process. Correctly separation of the joined strips is the one of the mainly problem in MSR process. Changing the rolling speed may causes easier of the strand division. In this paper results of the computer simulation of the double slitting rolling process were presented. Design/methodology/approach: For numerical modelling of the multi rolling process a computer program Forge 2005, based by the finished element method was used. As a slitting criterion normalised Cockroft-Latham criterion was used. Findings: For the analysis performed in this study, it was found that increasing of the rolling speed causes of increasing the normalized Cockroft-Latham criterion. For the small values of rolling velocity the strip separation was easier. Research limitations/implications: Multi Slit Rolling process is applied in ribbed rods rolling. Adjusting of the rolling speed in multi slit rolling process could improve of the slitting band to the separated strips. Originality/value: Incorrect construction or bad gap matching could cause lack of separation propelled slitting rolls. The separation of the band is effected by means of separating rollers, which shape must be properly designed to suit to the slitting pass. Changing of the rolling speed could improve of the separation to the single strips.