The Influence of the Deposit Parameters on the Medium Chemical Composition of the Welded Joint

2017 ◽  
Vol 68 (10) ◽  
pp. 2261-2264
Author(s):  
Dumitru Titi Cicic ◽  
Corneliu Rontescu ◽  
Ana Maria Bogatu ◽  
Catalin Gheorghe Amza ◽  
Oana Roxana Chivu
Keyword(s):  
Chemical Composition ◽  
Chemical Industry ◽  
Welded Joint ◽  
Base Material ◽  
Working Environment ◽  
Geometrical Configuration ◽  
Optimal Parameters ◽  
Combined Process ◽  
Welding Technology ◽  
Material Mixing

Recipient type products from energetic and chemical industry undergo a wide combined process of corrosion and ware, due to working environment. In order to put this products back in use, in a shorter period of time, welding reconditioning procedures are applied which mainly aim to restore the geometrical configuration but also the characteristics growth. Any welding technology applied, involves melting a filler material but also a part of the base material, mixing them, thereby obtaining the welded joint. The paper present the experimental results obtained in determining the optimal parameters for Metal Active Gas welding deposit that are going to be used for the restoration of some components from energetic and chemical industry and that are highlighting the dependence between the deposit parameters and the chemical composition of the juncture.

Aspects Regarding Repetitive Maintenance Concept in Push Blades for Loading Equipment

2017 ◽  
Vol 907 ◽  
pp. 140-144
Author(s):  
Daniel Tihanov Tanasache ◽  
Carmen Florea ◽  
Daniela Maria Iovanaș ◽  
Emilia Florina Binchiciu ◽  
Aurelia Binchiciu
Keyword(s):  
Chemical Composition ◽  
High Resistance ◽  
Base Material ◽  
Specific Area ◽  
Good Resistance ◽  
Metal Base ◽  
Welding Technology ◽  
Bulk Loading ◽  
Complex Carbides ◽  
Deposited Metal

Preventive repeated maintenance concept provides elaborating, developing and reconditioning, repeatedly, in economic efficient conditions, of the pushing blades that equip bulk loading machines, namely leveling them. Applying the solution implies developing and elaborating active areas in direct contact with processed materials by loading through welding. To this end the base material of the blades is chosen to comply with the addition material afferent to the selected process, for predetermined circle tries, approx. 5 in the present moment.Research conducted to validate the loading through welding technology had primary objectives to obtain material couples base/addition that have a high resistance to intense bending demands, under load, combined with a good abrasion usage resistance or high pressure. The chemical composition of the basic materials in the pushing blades, is afferent to high resistance steels, with a maximum of1.6%Mn, max. 1.5%Cr, max.2%Ni, max. 0.7%Mo and max. 0.005%B. The chemical composition of the deposited material, through welding, falls into steel prescription, type Fe-25%Cr-5%W-Nb-Ti-B, with metallographic structures that have a high content of complex carbides and hardness of minimum 60 HRC. Sclerometric tried and metallographic research of specific area of the deposited metal/base metal ensemble did not highlight any imperfections such as cracks or white sports in the thermal influenced areas.Research regarding exploitation behaviour, of basaltic aggregates in loading conditions or cereals, have shown a good resistance at wear.

Research on the Laser Welding Technology of LF21

2014 ◽  
Vol 941-944 ◽  
pp. 2012-2015
Author(s):  
Jia Rui Qi ◽  
Xu Ren Huang ◽  
Hai Xia Sun ◽  
Yan Li Li
Keyword(s):  
Tensile Strength ◽  
Laser Welding ◽  
Pulse Width ◽  
Welded Joint ◽  
Pulsed Laser ◽  
Base Material ◽  
Pulse Frequency ◽  
Pulsed Laser Welding ◽  
Maximum Tensile Strength ◽  
Welding Technology

Traditional welding methods are difficult to adapt to the development of welding technology of aluminum alloys. Laser welding plays an important role in this field increasingly for its advantages. In this investigation, LF21 plate with a thickness of 2mm was welded utilizing the pulsed laser welding and the mechanical properties of the laser welded joints are analyzed. The tensile strength of welded joint is in the range of 196 Mpa to 232 Mpa. The maximum tensile strength is obtained at the working current of 250 A, pulse width of 6 ms and pulse frequency of 2 Hz. The maximum tensile strength can reach 87% of base material. The intensity factor of welded joint is in the range of 74% to 87%. The welded joint can meet the requirements of users.

Research on the Laser Welding Technology of GH4169

2014 ◽  
Vol 633-634 ◽  
pp. 703-706 ◽  
Author(s):  
Jia Rui Qi ◽  
Hua Kai Wei ◽  
Dan Feng Zhang ◽  
Li Han
Keyword(s):  
Tensile Strength ◽  
Laser Welding ◽  
Large Range ◽  
Welded Joint ◽  
Pulsed Laser ◽  
Base Material ◽  
High Tech ◽  
High Tensile Strength ◽  
Pulsed Laser Welding ◽  
Welding Technology

Superalloys have a high tensile strength at elevated temperature, a good stability and reliability in a large range of temperatures. Among these superalloys, GH4169 is widely used as thermal components in the turbojet engine. Traditional welding methods are difficult to adapt to the development of high-tech manufacturing. Laser welding plays an important role in superalloys welding field increasingly for its advantages. In this investigation, superalloy GH4169 plate with a thickness of 1mm was welded utilizing the pulsed laser welding and the mechanical properties of the laser welded joints are analyzed. The maximum tensile strength is 928 Mpa, which is close to the base material tensile strength. The welded joint can meet the requirements of users.

Calculation And Experimental Substantiation Of Optimal Design Of The Welded Joint Of Plates On Соver Plates

2020 ◽  
pp. 17-24
Keyword(s):  
Welded Joint ◽  
Experimental Studies ◽  
Engineering Calculation ◽  
Tensile Tests ◽  
Physical Nonlinearity ◽  
Steel Plates ◽  
Optimal Parameters ◽  
Actual Problem ◽  
Numerical Research ◽  
Cover Plates

The article is devoted to the actual problem of assigning optimal parameters for connecting steel plates on cover plates with angular welds that are widely used in construction practice. The article presents the results of a comprehensive study of operation of a welded assembly of the plates connection on cover plates. An algorithm is proposed for determining the optimal parameters of a welded joint with fillet welds on the cover plates, which makes it possible to obtain a strength balanced connection. The results of full-scale tensile tests of models were presented. These results confirmed the correctness of the assumed design assumptions, and made it possible to obtain a form of destruction, not characteristic and not described in the normative literature, expressed by cutting the main elements along the length of the overlap in the joint. The possibility of such a form of destruction was confirmed by the results of numerical research in a nonlinear formulation. The optimal parameters of the nodal welded joint determined by engineering calculation are confirmed by experimental studies, as well as by the results of numerical experiments on models of calculation schemes, taking into account the physical nonlinearity of the material operation. The obtained dependence for determining the bearing capacity of the joint by the cut-off mechanism and the expression for limiting the overlap length of the cover plates will make it possible to predict the nature of the fracture and design equally strong joints.

Mechanical Behaviour of CoCrMo Alloy with Si Content

2015 ◽  
Vol 754-755 ◽  
pp. 1017-1022 ◽  
Author(s):  
Petrică Vizureanu ◽  
Mirabela Georgiana Minciună ◽  
Dragoş Cristian Achiţei ◽  
Andrei Victor Sandu ◽  
Kamarudin Hussin
Keyword(s):  
Tensile Strength ◽  
Chemical Composition ◽  
Testing Machine ◽  
Base Material ◽  
Optical Emission ◽  
Experimental Tests ◽  
Optical Emission Spectrometry ◽  
Emission Spectrometry ◽  
Standard Samples

.The paper present aspects about the obtaining of non-precious dental alloys (type CoCrMo and CoCrMoSi7), the determination of chemical composition by optical emission spectrometry and the experimental tests for determining the tensile strength, made on standard plate samples. The base material used in experiments was a commercial alloy, from CoCrMo system, which belongs to the class of dental non-precious alloys, intended to medical applications. The obtaining of studied alloy was made on arc re-melting installation, under vacuum, type MRF ABJ 900. The process followed to realize a rapid melting, with a maximum admissible current intensity. The samples for tests were obtained by casting in an electric arc furnace, under vacuum, in optimal conditions for melting and solidification and processing by electro-erosion, to eliminate all the disturbing factors which come by processing conditions for the samples. The determination of chemical composition for cobalt based alloys, by optical emission spectrometry, was made on SpectromaxX equipment with spark. The electrical discharge is made with the elimination of an energy quantity, fact which determine plasma forming and light issue. Tensile tests for standard samples, made from cobalt based alloy, was made on Instron 3382 testing machine, and assisted by computer. The obtained results are: elongation, elasticity modulus, tensile strength and offer complete information about the analyzed mechanical properties. For the certitude of obtained experimental results, the tests were made on samples with specific dimensions according ISO 6892-1:2009(E) standard, both for the tensile strength, and also machine operation.

Study of Crack Resistance of Layers Applied by Laser Surface Cladding

2014 ◽  
Vol 682 ◽  
pp. 410-413
Author(s):  
S.N. Namazov ◽  
E.D. Rzayev ◽  
V.F. Jivishov
Keyword(s):  
Chemical Composition ◽  
Crack Initiation ◽  
Crack Resistance ◽  
Crack Formation ◽  
Laser Surface ◽  
Surface Cracks ◽  
Welding Technology

The paper describes the crack initiation in the layers which were applied by laser surface cladding. The paper investigates the influence of the chemical composition of layer materials and welding technology on the tendency of the crack formation. Proposed method can dramatically reduce the formation of surface cracks in the applied layers.

scholarly journals A Numerical Strategy to Identify the FSW Process Optimal Parameters of a Butt-Welded Joint of Quasi-Pure Copper Plates: Modelling and Experimental Validation

2021 ◽  
Author(s):  
Monica Daniela IORDACHE ◽  
Claudiu BADULESCU ◽  
Malick DIAKHATE ◽  
Adrian CONSTANTIN ◽  
Eduard Laurentiu NITU ◽  
...  
Keyword(s):  
Welded Joint ◽  
Pure Copper ◽  
Correlation Method ◽  
Image Correlation ◽  
Experimental Investigations ◽  
Optimal Parameters ◽  
Friction Stir ◽  
Mass Scaling ◽  
Surface Response ◽  
Fsw Parameters

Abstract Determining the optimal parameters of the Friction Stir Welding (FSW) process, which are suitable for a given joint configuration, remains a great challenge and is often achieved through extremely time-consuming and costly experimental investigations. The present paper aims to propose a strategy for the identification of the optimal parameters for a butt-welded joint of 3-mm thick quasi-pure copper plates. This strategy is based on FEM (finite elements method) simulations and the optimal temperature that is supposedly known. A robust and efficient finite element model that is based on the Coupled Eulerian-Lagrangian (CEL) approach has been adopted and a temperature-dependent friction coefficient has been used. Besides, the mass scaling technique has been used to significantly reduce the simulation time. The thermo-mechanical behavior of the butt-welded joint was modeled using a Johnson-Cook plasticity model that was identified through lab tests at different temperatures. The results of the parametric study help to define the numerical surface response, and based on this latter one can found the optimal parameters, advancing (υa) and rotational (υr) speeds, of the FSW process. This numerical surface response has been validated with good agreement between the numerical prediction of the model and the experimental results. Furthermore, experimental investigations involving x-ray radiography, digital image correlation method, and fracture surface analysis have helped a better understanding of the effects of FSW parameters on the welded joint quality.

Study of the Chemical Composition and Microstructure of AISI 321/Cu/Ta/Ti Welded Joint

2020 ◽  
Vol 121 (11) ◽  
pp. 1112-1118
Author(s):  
N. B. Pugacheva ◽  
A. M. Orishich ◽  
A. N. Cherepanov ◽  
E. I. Senaeva ◽  
E. B. Trushina
Keyword(s):  
Chemical Composition ◽  
Welded Joint ◽  
Aisi 321

FEATURES OF REPAIR OF WELDED STRUCTURES OF LARGE THICKNESSES FROM TITANIUM ALLOY VT6ch.

2021 ◽  
pp. 34-43
Author(s):  
A.V. Sviridov ◽  
◽  
М.S. Gribkov ◽  
Keyword(s):  
Titanium Alloy ◽  
Residual Stresses ◽  
Elemental Composition ◽  
Welded Joints ◽  
Mechanical Characteristics ◽  
Electron Beam Welding ◽  
Welded Joint ◽  
Vacuum Annealing ◽  
Base Material ◽  
Welded Structures

The technology of electron-beam welding (EBW) of structures of large thickness made of titanium alloy Ti–6Al–4V has been developed. A complex of metallographic studies of welded samples has been carried out. Tests to determine the mechanical characteristics of repair welded joints, that these joints made by EBW are equal in strength to the base material. The analysis of the level of residual stresses in various parts of the welded joint after repeated repair passes has been carried out. It was found that the subsequent vacuum annealing reduces the level of residual stresses in welded joints to 50 %. The analysis of the elemental composition showed that the elemental composition of the samples from the center of the weld to the base metal practically does not change for welding with the number of repeated passes up to 3.

scholarly journals Flash Welding of Microcomposite Wires for Pulsed Power Applications

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1053
Author(s):  
Nikolaj Višniakov ◽  
Jelena Škamat ◽  
Olegas Černašėjus ◽  
Artūras Kilikevičius
Keyword(s):  
Welded Joint ◽  
Butt Joint ◽  
Pulsed Power ◽  
Magnetic Systems ◽  
Butt Welding ◽  
Welding Technology ◽  
Welding Defects ◽  
Welding Joints ◽  
Strength And Plasticity ◽  
Flash Welding

This paper presents the experimental results of Cu-Nb wire joining upon applying flash welding technology. The present research is aimed at investigating the structure, electrical and mechanical properties of butt welding joints of Cu-Nb conductors, usable for coils of pulsed magnetic systems. The butt joint structure was found to be free of welding defects. The structure of the butt welded joint provides an insignificant increase in electrical resistance and sufficient ultimate strength and plasticity of the joint. The tensile strength of the welded sample reaches 630 MPa.

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