Papers by Author: Józef Zasadziński

Abstract: The paper presents the results of a study to designate the optimal conditions for the powder mixtures extrusion through porthole die to ensure high quality welds. Conditions for obtaining the profiles of powder mixtures with a high degree of compaction and good quality welds have been determined based on mathematical and physical modelling. Modelling studies have been confirmed in laboratory and industrial trials.

Abstract: In the work, numerical calculations of extrusion process of 2024 alloy through porthole dies were performed. The DEFORM 3D program based on Finite Element Method was used. The way of metal flow, distributions of stresses as well as temperature level within the welding chamber were predicted for different geometry of porthole die. Particularly, different height, width, and shape of the welding chamber were adopted in calculations. The calculations allowed predicting both hydrostatic pressure and temperature levels as well their distributions in the welding region providing the best welding conditions for the alloy tested.

Abstract: In the work the distribution of stresses and strains as well as temperature field within the welding chamber of the porthole die were determined. The analysis was performed by the use of the computer program DEFORM based on a finite element method. The direct hot extrusion of 2024 aluminum alloy was investigated with the use of the porthole dies of different geometry. Particularly, a different height of the welding chamber was adopted in calculations. The calculations allowed determining both pressure and temperature levels and their distributions within the welding chamber leading to the best welding conditions for the alloy tested.