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•  1-2/2016 table of contents

Lukács J.:
Department of Mechanical Technology, Institute of Materials Science and Technology is 65 years old    5
The present state of the Institute of Materials Science and Technology was established in 2013 in the framework of the faculty restructuring. In the new structure the institute joining two departments is committed to continue the successful education and research work of the Department of Mechanical Technology looking back on the 65 year old history.

Tisza M.;Török I.:
Postgraduate course for welding engineering was organised 55 years ago In Hungary     11
In 1960 at the Technical University of Heavy Industry Professor Béla Zorkóczy, founder head of the department of the Mechanical Technology organised the postgraduate course for welding engineering. The postgraduate course carrying out on the basis of the many times changed curriculum gives students IWE diploma has already been accepted all over the world.

Gáspár M.; Balogh A.:
Development of a Gleeble specimen for impact testing of simulated HAZ     19
Using the Gleeble 3500 physical simulator, authors investigated the different strips of the heat affected zone of the high strength steels (HSS). Standard specimens were not suitable for realising high cooling rates necessary for simulation of welding HSS. The developed new specimen containing cooling boreholes at both ends gives possibility to achieve more intensive inner cooling.

Budai D.; Tisza M.; Kovács P. Z.:
Investigation of aluminium alloys’ formability at elevated temperatures     23
Applying aluminium alloys in automotive industry the weight of cars can be decreased more degree than using high strength steels. However, forming and welding operations of these alloys are much more difficult than the same of steels. Authors investigated the formability of aluminium alloy of EN AW 5754 (Al-Mg3) at elevated temperatures. Formability of this alloy at 200 °C was double than the same at room temperature.

Tóth D.; Kovács P. Z.; Tisza M.:
The examination and optimization of 3D printing (FDM) parameters     29
The FDM (Fused Deposition Modelling) process using polymer filament is one of the cheapest and most practical processes, by which a few products can be manufactured without expensive dies or tools. Investigations carried out using PLA (polylactide) filament proved that strength and formability characteristics of products can considerably be improved with optimal setting of printing parameters.

Szilágyiné Biró A.; Tisza M.:
Decreasing the porosity of nitrided layer applying cyclic Floe process     33
Gas nitriding is one of the well-known thermochemical processes, which is suitable for improving the surface properties of machine elements or tools and dies. Improving the Floe process authors developed and applied a new cyclical technological procedure, by which the thickness and the rate of porosity of compound (so-called white) layer can be decreased.

Kerekes G.; Felde I.; Kocsisné Baán M.:
Investigation the parameter-dependency of cooling performance of liquid quenchants     39
Microstructure of the quenched parts strongly depends on the applied quenchant. On the basis of the standardised method described in ISO 9950 authors compared different quenchants like water, aqueous polymer solution, mineral oil and vegetable oils. According to their substantial conclusion mineral oils can well be substituted with vegetable oils.

Prém L.; Bézi Z.; Balogh A.:
Development of resistant spot welding technology for automotive ferrite-martensitic DP steels with joint application of finite element modelling and experimental research     45
Because of their hardening effect, resistance spot welding of automotive ferrite-martensitic DP steels should be carried out differently from mild steels. According to the authors’ investigation appropriate spot welds can be made by pulsed energy input. In order to decreasing experimental costs applying the finite element modelling for selection of parameters of pulsed energy input would be effective.

Dobosy Á.; Lukács J.:
Determination of the optimal welding lobe of the thermomechanical high strength steels     55
In spite of the well-known fact that welded structures loaded in general by cyclic forces, the weldments are designed and sized for static load. In their paper authors analyse the experimental results obtained from the investigation carried out for determination of optimum welding lobe of the thermomechanical high strength steels of S960M.

Meilinger Á.; Török I.:
Properties of friction stir welded joints under low cyclic loading conditions     63
Fusion welding of aluminium alloys is more difficult task than the same of different steel grades. Friction stir welding belonging to the group of pressure welding helps to eliminate the weldability difficulties. Authors analyse the behaviour of friction stir welded joints of aluminium alloys under low cyclic loading.

Somoskői G.; Török I.:
Theoretical and practical investigation of the CMT welded pin     73
Applying Cold Metal Transfer (CMT) (one of the process versions of GMAW) small wire pieces (pins) can be welded to the metal surfaces. The pins improve the strength of the adhesive joint created between metal and polymer elements. Authors analyse the welding parameters affecting on the pin geometry.

Pósalaky D.; Lukács J.; Török I.:
Weldability problems of 6082-T6 high strength aluminium alloy and the properties of welded joints     77
Paper deals with the weldability problems of the 6082-T6 (Al-Mg-Si) high strength aluminium alloy, which is one of the widely used Al alloys in automotive industry. Main goal of the investigation is to realise welded joints, which are able to resist cyclic force, loading the welded structure.

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