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Drobeta-Turnu Severin, Romania

Saceanu C.,Science Campus Con Tur | Rosu R.A.,Polytechnic University of Timisoara | Pascu D.R.,ISIM Timisoara
Metalurgia International | Year: 2012

The paper presents the experimental research concerning the galvanized steel welded joints made by CMT (Cold Metal Transfer) method. CMT method is applied to metallic materials with small thickness (maximum 3.0 mm), where there are rapid heat transfer phenomena during the weld cooling and the structural changes are difficult to control. Structural and mechanical characterization of galvanized steel mark DX51D+Z150-N-A-C with the thickness of 1.0 mm according to EN 10327:2004 welded using the electrode wire mark SG-CuSi3 according to DIN 1733, revealed structural and mechanical features that are similar to those of the galvanized steel. Finally, based on the obtained experimental results, it is estimated that the welded joints made from galvanized steel by CMT method have provided the structural and mechanical characteristics required to their promotion in industrial building of high responsibility. Source


Saceanu C.,Science Campus Con Tur | Rou R.A.,Polytechnic University of Timisoara | Pascu D.R.,ISIM
Metalurgia International | Year: 2011

The paper presents several methods of hard alloys deposition on the surfaces of coal and rock crush hammers. Structural and mechanical characteristics of the hard rocks impose to be chosen hard alloys to achieve deposition layers which will help to increase the life time of the metallic hammers made by cast weldable steels type 340-550 W according to ISO 3755.As deposition materials were used (307 FILINOX wire, FLUXOFILM 58 tubular wire FILEUR AMC-60 tubular wire and HARDFACE TIC tubular wire) and nickel-based powders (METCO 450P) with the maximum hardness of 739 HV5 and ceramics based powders (METCO 105NS-Al2O3) obtaining hard layers whose hardness varies between 549 and 841 HV5 with the maximum thickness of 238.5 μm. The analysis in terms of structure/hardness/thickness of the deposited layers allowed the selection of the optimum hardening variant using HARDFACE TIC tubular wire, obtaining layers without defects on the crush hammers surfaces. Source


Saceanu C.,Science Campus Con Tur | Rosu R.A.,Polytechnic University of Timisoara | Pascu D.R.,ISIM Timisoara
Metalurgia International | Year: 2012

The paper presents the experimental results obtained after the endurance tests of six hardened hammers on the external surface tested in a coal mill. Macro-microscopic examinations performed on the samples taken from hammers and subjected to endurance tests shows fine martensitic structure in the deposited layers with the hardness between 473 and 644 HV5, the values of the local hardening estimator does not exceed 26.55%. The endurance test durations chosen (240, 420, 657 and 813 hours) led to mass loss up to 4.0 kg at 420 hours, a period greater than the value of 250 hours imposed by the designer, thus proving the beneficial role of the deposited layers on the active surfaces of the coal hammers mill. Source

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