Explosion Cladding of CuSn Bronze to Malleable Iron

2011 ◽  
Vol 214 ◽  
pp. 422-425
Author(s):  
Milan Turňa ◽  
Jozef Ondruška ◽  
Peter Nesvadba ◽  
Mária Behúlová
Keyword(s):  
Cast Iron ◽  
Optical Microscopy ◽  
Welding Parameters ◽  
3D Scanner ◽  
Malleable Iron ◽  
Malleable Cast ◽  
Ultrasonic Defectoscopy ◽  
Edx Microanalysis ◽  
Selection Of

Process of cladding CuSn bronze on malleable cast iron was studied. Characteristics of welded materials are described. Preparation of welded materials is outlined. Selection of suitable explosive is discussed. Design of welding assembly is illustrated. Welding parameters and conditions are given. Bimetals were fabricated. The quality of fabricated bimetals was inspected by ultrasonic defectoscopy, strains were measured with a 3D scanner and the microstructure was studied by optical microscopy and EDX microanalysis.

The Effect of Atmosphere and Vacuum on Character of Weld Joints Fabricated by Explosion

2014 ◽  
Vol 875-877 ◽  
pp. 1472-1476 ◽  
Author(s):  
Miroslav Jáňa ◽  
Milan Turňa ◽  
Jozef Ondruška ◽  
Petr Nesvadba
Keyword(s):  
Welding Parameters ◽  
Scientific Program ◽  
3D Scanner ◽  
Weld Joints ◽  
Air Atmosphere ◽  
Detonation Speed ◽  
Set Up ◽  
The Impact ◽  
Edx Microanalysis

This paper presents an experiment conducted in Explosia, a.s., Pardubice. A bimetal prepared of AZ 31 Mg alloy - CrNi austenitic steel was tested in various conditions, and consequently its quality was assessed. Focus was particularly on the impact of atmosphere and vacuum on the interface character of the metals (bimetals) prepared by explosion. Parallel placement of the materials being welded was used for welding in both vacuum and air atmosphere. Welding sets were designed and manufactured. The welding parameters and conditions were set up utilising the available computational means, and then verified by simulation in ANSYS engineering-scientific program. Used was Semtex S 35, a loose explosive, as well as Startline 12, an initiation explosive. Bimetal was fabricated in the air atmosphere at the detonation speed 2613 m.s-1 and in vacuum at the detonation speed 2597 m.s-1. Quality of bimetals was assessed by optical microscopy, measuring deformations by a 3D scanner, measuring microhardness and also by EDX microanalysis.

scholarly journals Influence of Selected Parameters of Continuous Casting in the Electromagnetic Field on the Distribution of Graphite and Properties of Grey Cast Iron

2014 ◽  
Vol 59 (2) ◽  
pp. 747-751 ◽  
Author(s):  
J. Szajnar ◽  
M. Stawarz ◽  
T. Wróbel ◽  
W. Sebzda
Keyword(s):  
Electromagnetic Field ◽  
Cast Iron ◽  
Continuous Casting ◽  
Grey Cast Iron ◽  
Flake Graphite ◽  
Continuous Ingot ◽  
Grey Cast ◽  
Continuous Casting Mould ◽  
Selection Of

Abstract In paper problem concerning modification of grey cast iron EN-GJL-200 Grade, which is realized mainly by intensification of liquid metal movement in horizontal continuous casting mould containing electromagnetic stirrer is presented. The range of studies contains influence of electromagnetic field on morphology of graphite and usable properties i.e. tensile strength, hardness and machinability. Moreover the influence of velocity of ingot pulling on microstructure was analyzed. The results of studies and their analysis show possibility of improvement in quality of grey cast iron continuous ingot firstly in result of elimination of hard spots in structure by properly selection of velocity of ingot pulling and second in result of unification of size, shape and distribution of flake graphite by application of electromagnetic field.

Restoration of Agricultural Machines Surfaces by White Cast Iron with the Formation of Technological Repair Units

2018 ◽  
Vol 927 ◽  
pp. 43-47
Author(s):  
V.K. Afanasyev ◽  
A.P. Chernysh ◽  
S.V. Dolgova
Keyword(s):  
Surface Layer ◽  
Cast Iron ◽  
White Cast Iron ◽  
Low Cost ◽  
Operating Conditions ◽  
Technological Environment ◽  
New Approach ◽  
Selection Of ◽  
Agricultural Machines

This article develops a fundamentally new approach in the selection of optimal methods for restoring of worn surfaces of agricultural machines’ tools with the formation and application of technological repair units. Based on the systematization and linkage of modular worn-out surfaces, their operating conditions, technological environment and the choice of their optimal combinations, it found a low-cost method of restoring details with white cast iron to gain a necessary quality of a new surface layer.

Welding Parameter Optimization of Surface Quality by Taguchi Method

2014 ◽  
Vol 660 ◽  
pp. 109-113
Author(s):  
Chuan Huat Ng ◽  
Mohd Khairulamzari Hamjah
Keyword(s):  
Taguchi Method ◽  
Surface Quality ◽  
Weld Pool ◽  
Welding Current ◽  
Droplet Formation ◽  
Welding Parameter ◽  
Welding Parameters ◽  
Weld Parameters ◽  
Selection Of

An experimental study of GTAW was conducted to determine the optimization of weld parameters on the droplet formation in the surface quality of weld pools. These optimization investigations consisted of welding current, welding speed and feed rate. The strength and surface quality of weld pool were measured for each specimen after the welding parameter optimizations and the effect of these parameters on droplet formation were researched. To consider these quality characteristics together in the selection of welding parameters, the Orthogonal Array of Taguchi method is adopted to analyze the effect of each welding parameter on the weld pool quality, and then to determine the welding parameters with the optimal weld pool quality.

Electron Beam Welding of TZM Sheets

2016 ◽  
Vol 879 ◽  
pp. 1865-1869 ◽  
Author(s):  
Markus Stütz ◽  
Diogo Oliveira ◽  
Matthias Rüttinger ◽  
Nikolaus Reheis ◽  
Heinrich Kestler ◽  
...  
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Electron Beam ◽  
Fusion Zone ◽  
Electron Beam Welding ◽  
Systematic Investigation ◽  
Welding Parameters ◽  
Careful Selection ◽  
Selection Of

In the scope of this work, 2 mm thick TZM sheet metal is butt welded by electron beam welding (EBW) without filler material and a systematic investigation of the most relevant welding parameters to improve the weld quality is conducted. With the aid of design of experiment (DoE), it is shown that with careful selection of the welding parameters it is possible to considerably reduce the size of the fusion zone and the heat affected zone and the grain size of both. Furthermore, the influence of the parameters on the quality of the weld and the characterizing values ultimate tensile strength and hardness of fusion zone is presented. It is concluded, which parameters influence the quality of the weld and suppress pores and cracks.

scholarly journals Welds’ Quality of Aluminium Alloy Components of Military Aircraft Executed by Arc Welding Method

2017 ◽  
Vol 44 (1) ◽  
pp. 321-332
Author(s):  
Piotr Woźny ◽  
Józef Błachnio ◽  
Krzysztof Dragan
Keyword(s):  
Computed Tomography ◽  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Arc Welding ◽  
Welding Process ◽  
Welding Parameters ◽  
Factors Affecting ◽  
Process Qualification ◽  
Selection Of

Abstract The paper presents the problems arising in the process of repairs of aircraft (AC) components made of aluminium alloys during arc welding with the TIG (tungsten inert gas) method. The paper provides information on the rules applicable in the welding process qualification. The procedure algorithm when qualifying the welding process was presented in accordance with PN-EN ISO 15614-2. The main causes and factors affecting the formation of defects and welding imperfections were described and classified. The principles of preparing the components for welding and selection of a binder were discussed. The issue of effect of the welding parameters on the formation of defects and welding imperfections in relation to PN-L-01426 standard was raised. The application of computed tomography in assessment of the welded joints was described and tomograms from tests of butt welds of aluminium alloys made of the AW 5754 grade aluminium alloy were presented. On the example of the tomograms, the welding imperfections and defects formed in the tested joints were discussed. The usefulness of computed tomography in assessment of the welds’ quality was shown.

scholarly journals THE DEVELOPMENT OF NEW CASTING ALLOYS INTENDED FOR OPERATION UNDER EXTREME CONDITIONS AND SOME TECHNIQUES OF MAKING CASTINGS FROM THEM

2016 ◽  
Vol 2 ◽  
pp. 51-60
Author(s):  
Mikhail Yamshinskij ◽  
Grigoriy Fedorov ◽  
Anatoliy Verkhovliuk
Keyword(s):  
Cast Iron ◽  
High Heat ◽  
Coarse Grained ◽  
Extreme Conditions ◽  
Structure And Properties ◽  
Heat Resistant ◽  
Casting Alloys ◽  
Metal Castings ◽  
Selection Of

The article studies new heat-resistant and wear resistant materials for operation under extreme conditions, especially in the power industry. The methods that improve the quality of a metal in metal castings through the influence of alloying elements on its structure and properties have been considered. These methods are very effective for reducing the tendency of a metal to form a coarse–grained structure. The paper describes optimal techniques for melting special alloys in induction and electric furnaces. A set of rules for the selection of a melting temperature before pouring a metal into the casting forms depending on the dimensions, wall thickness, geometry of castings have been determined. The behavior of new alloys under the conditions of high temperatures, aggressive environments has been studied. It has been established that heat–resistant Cr–Al steels exhibit high heat resistance and wear resistance properties; they 6–8 times surpass Cr–Ni steels in oxidation resistance. The proposed Cr–Mn cast iron processed in an integrated manner with REM (rare earth metals) and Ti is superior to a basic cast iron in conditions of a heavy wear. Numerous industrial trials confirm the usefulness of recommended new casting materials for use under extreme conditions.

ON THE EXPERT’S RIGHT TO BE PRESENT AT LEGAL PROCEEDINGS

2016 ◽  
Vol 15 ◽  
pp. 163-171
Author(s):  
M. G. Shcherbakovskiy
Keyword(s):  
Initial Data ◽  
Legal Proceedings ◽  
Reliable Assessment ◽  
Data Acquiring ◽  
Selection Of

The article discusses the reasonsfor an expert to participate in legal proceedings. The gnoseological reason for that consists of the bad quality of materials subject to examination that renders the examination either completely impossible or compromises objective, reasoned and reliable assessment of the findings. The procedural reason consists ofa proscription for an expert to collect evidence himself or herself. The author investigates into the ways of how an expert can participate in legal proceedings. If the defense invites an expert to participate in the proceedings, then it is recommended that his or her involvement should be in the presence of attesting witnesses and recorded in the protocol. In the course of the legal proceedings an expert has the following tasks: adding initial data, acquiring new initial data, understanding the situation of the incident, acquiring new objects to be studied, including samples for examination. An expert’s participation in legal proceedings differs from the participation of a specialist or an examination on the scene of the incident. The author describes the tasks that an expert solves in the course of legal proceedings, the peculiarities ofan investigation experiment practices, the selection of samples for an examination, inspection, interrogation.

Implementasi Voip Server Berbasis IPV6 Dengan Raspberry PI

2019 ◽  
Vol 9 (01) ◽  
pp. 47-54
Author(s):  
Rabbai San Arif ◽  
Yuli Fitrisia ◽  
Agus Urip Ari Wibowo
Keyword(s):  
Internet Protocol ◽  
Wireless Transmission ◽  
Raspberry Pi ◽  
Test Results ◽  
Average Delay ◽  
Ipv6 Network ◽  
Ip Network ◽  
Selection Of ◽  
Better Than

Voice over Internet Protocol (VoIP) is a telecommunications technology that is able to pass the communication service in Internet Protocol networks so as to allow communicating between users in an IP network. However VoIP technology still has weakness in the Quality of Service (QoS). VOPI weaknesses is affected by the selection of the physical servers used. In this research, VoIP is configured on Linux operating system with Asterisk as VoIP application server and integrated on a Raspberry Pi by using wired and wireless network as the transmission medium. Because of depletion of IPv4 capacity that can be used on the network, it needs to be applied to VoIP system using the IPv6 network protocol with supports devices. The test results by using a wired transmission medium that has obtained are the average delay is 117.851 ms, jitter is 5.796 ms, packet loss is 0.38%, throughput is 962.861 kbps, 8.33% of CPU usage and 59.33% of memory usage. The analysis shows that the wired transmission media is better than the wireless transmission media and wireless-wired.

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