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Popescu M.,Polytechnic University of Timisoara | Rosu R.A.,Polytechnic University of Timisoara | Rosu R.A.,National Institute of Research and Development in Welding and Material Testing
12th International Multidisciplinary Scientific GeoConference and EXPO - Modern Management of Mine Producing, Geology and Environmental Protection, SGEM 2012 | Year: 2012

Industrial waste, type and their production but also their administrations raise many problems, in the conditions of sustainable development. It requires a strategy and clear strategic objectives, principles, taking into account all the involved factors and tools to achieve these objectives. Very important are also the dangerous waste, imposing the elaboration of some directives regarding them and their management due the implications that they presents, their unattended existence and properly monitored. There are imposed the evaluation of the resources level for environmental protection, but also the assurance of a legislative framework in the field. Waste of any kind resulted from multiple health human activities, is a highly topical issue, because of continued growth in the amount and variety of their importance and because of the amount of the unused materials that can be collected, recovered and reutilized. It is also presented a very actually case study which refers to collection and recovery of zinc waste. © SGEM2012 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM. Source


Rosu R.A.,National Institute of Research and Development in Welding and Material Testing | Rosu R.A.,Polytechnic University of Timisoara | Popescu M.,Polytechnic University of Timisoara
12th International Multidisciplinary Scientific GeoConference and EXPO - Modern Management of Mine Producing, Geology and Environmental Protection, SGEM 2012 | Year: 2012

Cold Metal Transfer (CMT) process is used successfully in many industrial applications because of the advantages (low linear energy, accuracy) to similar or dissimilar joints. The paper presents the experimental results regarding the realization of steel pipe joints mark P195GH with Ø255mm and thickness of 4.5 mm using as filler material electrode wire SG-CuSi3 alloy (DIN 1733) with the diameter of 1.2 mm. Tensile test values are between 122 and 123 N/mm2, the breaking taking place in base metal. The macro-microscopic analyzes of the welded joints in the characteristic areas showed not welding defects such as cracks. © SGEM2012 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM. Source


Popescu M.,Polytechnic University of Timisoara | Rosu R.A.,Polytechnic University of Timisoara | Rosu R.A.,National Institute of Research and Development in Welding and Material Testing
12th International Multidisciplinary Scientific GeoConference and EXPO - Modern Management of Mine Producing, Geology and Environmental Protection, SGEM 2012 | Year: 2012

Welding quality can be achieved only by personnel with and without higher education, but with an adequate level of competence. Since the ability to control the operating personnel it is referring mainly to a current competence than the routine is a legal require to periodic renewal of the certification personnel European Welding Federation (EWF), since it was founding had the first task to harmonization, perfection and qualification of the welding personnel because the large and small producers of welded construction have a great need for qualified personnel, and continuously improved. Currently, at European and International level, there are the following career paths in welding: International/European Welder, International/European Practitioner Welder, International/European Welding Specialist, International Welding Technologist, International/European Welding Engineer, International/European Welding Inspector, European Thermal Spray Specialist, Resistance Welding Specialist, European Adhesive Specialist, Plastic Welder and European Aluminothermic Welder. The qualification mode at International or European level is regulated, in addition by EWF (European Welding Federation), by the International Institute of Welding IIW-IIS and by International Authorization Body (IAB) by developing guidelines. © SGEM2012 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM Published by STEF92 Technology Ltd. Source


Popescu M.,Polytechnic University of Timisoara | Rosu R.A.,Polytechnic University of Timisoara | Rosu R.A.,National Institute of Research and Development in Welding and Material Testing | Silvia Pernevan M.,Polytechnic University of Timisoara
12th International Multidisciplinary Scientific GeoConference and EXPO - Modern Management of Mine Producing, Geology and Environmental Protection, SGEM 2012 | Year: 2012

Recovery (recycling) of plant resources is in a favorable international context and represents the strong concern at economic, environmental protection and social level. There are presented the properties of the biocomposite fiber material (flax, jute, sisal, cotton, liberian fibers etc) and it is explained by comparison to others materials, insisting on their biodegradable nature, but also on the increasingly and diversified applications (agriculture, packaging, construction, transport, household etc). The concerns in this area as regards the production and their processing, the ecological character, as well as the principle of integrated engineering applied in line with the sustainable development are distinct parts of this works. © SGEM2012 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM. Source


Scutelnicu E.,University of Galati | Birsan D.,University of Galati | Cojocaru R.,National Institute of Research and Development in Welding and Material Testing
International Conference on Manufacturing Engineering, Quality and Production Systems, MEQAPS - Proceedings | Year: 2011

This paper addresses a comparative study on Friction Stir Welding (FSW) and Tungsten Inert Gas (TIG) assisted FSW of copper. Adding an additional heat source, the base materials are preheated and some remarkable advantages are obtained such as: faster and better plasticization of the base material, reduced FSW tool wear and clamping forces, faster welding speed and improved weld quality. The aim of the investigation was to develop two finite element models, which simulate the welding of copper by FSW and TIG assisted FSW procedures, useful to predict the temperature distribution, peak temperature of the process, temperature changes in the cross section of the welded joints. The outcomes of the investigation are compared and analysed for the both welding variants. The numerical models were validated by thermography method. Source

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