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•  8/2013 table of contents

Tisza M.; Kocsisné Baán M.; Marosné Berkes M.; Török I.:
Material developments for the automotive industry     5
Under direction of University of Miskolc three Hungarian higher educational and a research institutes carry out research on material developments for the automotive industry. The sponsored basic research is aimed at metallic and non-metallic materials of cars as well as at formability, heat treating and welding of steels.

Balogh A.; Gáspár M.; Prém L.:
Classification and welding difficulties of conventional and advanced steels for welded structures     7
Established grouping system of steels did not keep pace with quick development of the modern high strength steels. Authors elaborated a timeless classification system for conventional and modern steels of welded structures. Welding of high strength steels brought to the surface much difficult problem.

Balogh A.; Prém L.:
Resistance spot weldability of ferrite-martensite (Dual Phase) steel sheets     13
Authors have investigated resistance weldability of Docol DP 600, DP 800 and DP 1000 produced by the Swedish company SSAB. Weldability of the steel grade DP 600 is relatively good, but the other two grades require special welding technology.

Gáspár M.; Prém L.; Vékony S.; Balogh A.:
Final element modelling of TIG welding of DP 600 automotive steel     19
Manufacturers achieve the desired mechanical properties of ferrit-martensite DP steels with different forming and heat treating processes. Structure instability of advanced steels causes weldability problems. Paper presents the possibility of finite element modelling can be used for planning the technology of GTAW of steel sheets.

Meilinger Á.; Lukács J.:
Behaviour of friction stir welded joints made of aluminium alloys under cyclic loading conditions     25
The research work aimed to examine the behaviour of the friction stir welded joints under cyclic loading conditions and to determine fatigue limit or design curves for aluminium alloys and their welded joints made by FSW process.

Somoskői G.:
Low power arc welding process variants and the material transfer at the gas metal arc welding     31
Paper tries to make differences among the lots of welding process variants existing today in the welding machine market. It shows in details the low power process variants of GMAW, namely in the short-arc range.

Dobosy Á.; Gáspár M.; Prém L.; Meilinger Á.:
Report on the 1st Summer University on Welding     35
In July of this year the Junior Forum of Welding Section of Scientific Society for Mechanical Engineering (GTE) organised the 1st Summer University on Welding at the University of Miskolc. After listening the professional lectures young participants made contacts with one to others and with outstanding experts of welding in the course of cheerful programs.

Nagy Gy.; Dobosy Á.; Lukács J.:
Reliability of the material characteristics evaluated on low cycle fatigue testing     39
Paper deals with the reliability analysis on the measured parameters during the low cycle fatigue test. Among others, it was established that the standard deviation coefficients of the stress amplitude was smaller than the other stress-like parameters determined by material testing.

Lukács J.; Kuzsella L.; Dobosy Á.; Pósalaky D.:
Evaluation of the hot-cracking sensibility on welding applying physical simulation     45
Authors analyse the relationship of weldability and hot cracking sensitivity with physical simulation. They present the results of investigations carried out on two high strength steels and an aluminium alloy using the Gleeble 3500 type simulator.

Kerekes G.; Kocsisné B. M.; Felde I.:
Qualification of quenching media     51
The shape of a cooling curve depends on the type of cooling media and the parameters describing the condition of quenchant. In this paper the influence of main parameters (temperature, agitation rate, concentration) on the cooling rate is shown.

Tisza M.; Kovács P. Z.:
Forming the sheet metals, investigating the determination of the forming limit diagrams     55
Application of high strength steels often leads to formability problems in the automotive industry. Authors describe their theoretical and experimental investigations on forming limit diagrams considered the most appropriate tools for characterizing the formability of metal sheets.

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