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  • Author: Károly Széll x
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Examination of Spot Welded Seam of a Car Body

Abstract

Spot welding is widely used in car industry to create a cheap and light body and chassis. Engineers tend to use spot-welding in order of reducing the production costs, also lowering the stress intensity which can cause failure and fractures of the body or chassis. Our goal here is to examine spot-welding of a car body with different tests and find out later if there is a possibility of using a different technology that can produce a better seam that can be automated with industrial robots.

Open access
Finite Element Modeling of Upsetting Considering Heat Generation

Abstract

In this article, a finite element modeling of the upsetting of a cylindrical workpiece is presented. In the modeling, the effects of friction, heat generation from deformation, and heat losses from conduction and convection are considered.

Open access
Heat Transfer Modeling and Validation in the Case of Butt Welded Joints

Abstract

The aim of our work is to compare the results of a virtual model to measure heat transfer data for butt welded joints. The primary goal is to compare real-time measured temperature with the software simulated data. The virtual model is a copy of the real product, technically a virtual prototyping process is examined. Prior to any production process such as joining by butt welding, real process parameters are tested on the model and later by experiments. In the case of many parts, the joining process is a key technology, where knowledge of the thermal effects of welding on the microstructure in the heat affected zone and the joint are vital.

Open access
Analysis of Recrystallization Peak Occuring During DSC Measurement

Abstract

Severe plastic deformation (SPD) is a well-established methodology for the processing of bulk ultrafine grained materials. Among various methods, equal channel angular pressing (ECAP) is the most popular way of creating ultrafine grained materials. The stored energy after ECAP in these substances highly influences the microstructural processes: recovery and recrystallization of the processed materials. We analyzed the recrystallization kinetics of room and elevated temperature ECAP processed copper samples using differential scanning calorimetry (DSC). For the processing of the measurement data we developed a MATLAB processing routine.

Open access
Technological and Theoretical Application of Finite Element Modeling of Deep Drawing

Abstract

For metal forming problems, even for a simple forming technology, finite element analysis can provide a solution for calculating deformations, determining stress and strain distributions. The aim of this study is to create a parametric finite element model for deep drawing technology, by which technological optimization as well as theoretical problems can be solved. By performing parameter studies, numerous cases can be analyzed.

Open access