This article presents a numerical analysis of laser-welded flange pipe joints. The presented results concern the welding of low carbon S235JR and stainless 316L steels using a CO2 laser in lap and fillet joint configurations. The estimation of welding parameters was achieved using Simufact Welding software and numerical simulation, where output power, feed rate, efficiency and intensity distribution (Gaussian parameter) were analysed. In accordance with the established model, a thermo-mechanical simulation was performed. The calculated joint geometries show good agreement with experiments; therefore, the obtained results were used to study selected joint properties of both joint types. Stress-strain distribution was estimated on the basis of thermomechanical analysis. Weld bead geometry obtained from numerical simulation was compared with the results from trial joints. The numerical model established for both joint configurations shows good agreement with experimental results and were assumed to be accurate. The results of the performed analysis shown some advantages of the use of this configuration of lap joints in flange pipe joints.
533The cutting tool trajectory of a hydraulic excavator during working with traditional machine results from experience and intuition of an operator. To allow the excavator for an automatic execution of planned trajectories, the machine should be provided with control system of fixtures motion. Such a digital control system for single bucket excavator, which has been built in the Kielce Branch of the Institute of Fundamental Technological Research of Polish Academy of Sciences, is presented in this paper.
Opisano system sterowania napędami w przyrządzie do gięcia rur cienkościennych, wykonanym na potrzeby badań prowadzonych w ramach projektu NCBR PBS/A5/47/2015. Przedstawiono projekt układu mechanicznego oraz krótko scharakteryzowano system sterowania. Zwrócono uwagę na wady i zalety rozwiązania. Zaproponowano możliwe modyfikacje układu w celu poprawy jego funkcjonalności. SŁOWA KLUCZOWE: formowanie laserowe, techniki laserowe, układy sterowaniaThe drives control system of bending equipment for thinwalled pipes has been presented. The design of the mechanical system was presented and the control system was briefly characterized. The advantages and disadvantages of the presented solution are discussed. Possible modifications of the system have been proposed in order to improve its functionality.
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