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Târgu Jiu, Romania

Amza G.H.,University of Bucharest | Petrescu V.,Lucian Blaga University | Dobrota D.,University of Targu Jiu | Apostolescu Z.,University of Bucharest | Albulescu R.G.,The Oil Company
Metalurgija | Year: 2015

Plating by welding in an ultrasonic field represents a technological solution to increase resistance to corrosion and/or wear of pieces of the machinery industry. Research has been carried out for two types of parts, namely a piece of flange end type and bonnet type made of AISI 4130 steel, and as filler material for plating was used Inconel 625 Fe developed as electrode wire with a diameter of ø 1.2/mm. The plating was done by depositing a single layer by welding in ultrasonic field, welding process in Ar 100/ % environment non-consumable tungsten electrode, WIG process, and when using ultrasonic activation it was used a longitudinal and a transverse wave with a frequency of 15/kHz. For pieces plated by welding there have been made attempts of the hardness and tensile and bend shock. © 2015, METALURGIJA. All Rights Reserved. Source

Amza G.,University of Bucharest | Dobrota D.,University of Targu Jiu | Petrescu V.,Lucian Blaga University | Apostolescu Z.,University of Bucharest | Albulescu R.G.,The Oil Company
Metalurgija | Year: 2015

To optimize the plating process is necessary to know the behavior of surfaces plated during the exploitation and in particular susceptibility to cracking, the formation of cracks from the inside to outside or reverse, embrittlement in the heat affected zone. Research has been realized considering several samples plated by welding without ultrasonic activation and with ultrasonic activation, and these samples were made of AISI 4130 steel, and as filler material was used Inconel 625 Fe developed as electrode wire ø 1,2/mm. The plating process was realized by a WIG welding process in Ar100 /% environment with non-consumable tungsten electrode, in two versions, respectively with and without the use of ultrasonic energy. Four pieces played by welding there were analyzed the metallographies structure in the base material, the deposited material and the material from the heat affected zone. © 2015, METALURGIJA. All Rights Reserved. Source

Cristinel R.,University of Targu Jiu | Luminita P.,University of Targu Jiu | Cristinel P.,University of Targu Jiu
12th International Multidisciplinary Scientific GeoConference and EXPO - Modern Management of Mine Producing, Geology and Environmental Protection, SGEM 2012 | Year: 2012

This study presents a study case on environmental risks due to energy complex operation in Romania. This study presents a situation from Rovinari complex which is a major producer of electricity and heat in Romania. Rovinari complex is composed of a power station with installed capacity of 1320 MW lignite mining pits on the surface. Rovinari power station consists of four power units with rated power of 330 MW lignite-operated. Combustion gases evacuated from the thermal power plant's chimneys Rovinari contain pollutants that affect air quality: SO2, NOx, CO, ash. Experimental results are presented on measurements of concentrations of pollutants in flue gases. Dispersion maps are presented of pollutants discharged by thermal power plant chimneys of Rovinari. There are presented the effects of pollutants in the thermal power plant boiler Rovinari and surrounding areas. Experimental research results are made with a camera with infrared and gas analyzers, air pollution due to lignite' selfburning deposits of career Tismana belonging to Complex Rovinari. © SGEM2012 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM Published by STEF92 Technology Ltd. Source

Popescu C.,University of Targu Jiu | Racoceanu C.,University of Targu Jiu
Recent Researches in Environment, Energy Planning and Pollution - Proc. of the 5th WSEAS Int. Conf. on Renewable Energy Sources, RES'11, EPESE'11, WWAI'11 | Year: 2011

The paper proposes to conduct a case study on the heating medium voltage bus barswhich enter in the configuration of stations and electrical posts. Taking into account the effects which may be generated by heat collector bars is required prophylactic permanent monitoring of this phenomenon. Source

Rabontu C.I.,University of Targu Jiu | Babucea A.G.,University of Targu Jiu | Paliu-Popa L.,University of Targu Jiu | Balacescu A.,University of Targu Jiu
Metalurgija | Year: 2015

Metallurgy is a domain of the secondary sector, which represented for years in Romania, as in other former Communist countries, a very important activity for gross domestic product and employment. Today, many enterprises which were representative in Romania for the metallurgical industry long ago are targets of the sellers of scrap metal, the scrap metal trade representing a segment that has gained momentum in recent years. Croatia, as a member country of the EU has a special contribution in the trade with metallurgical products and we have proposed in this paper to identify which is the level of international trade with metallurgical products of Romania and Croatia, which included a comparison between these countries. For this aim we’ll use the data provided by Eurostat and World Trade Organization (WTO). © 2015 Faculty of Metallurgy. All rights reserved. Source

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