scholarly journals Study of the influence of the addition of an exothermic mixture and the ratio of the components of the exothermic mixture on the melting indices at FCAW

2020 ◽  
Vol 6 (1) ◽  
pp. 47-53
Author(s):  
Bohdan Trembach ◽  
◽  
Aleksandr Grin ◽  
Illia Trembach ◽  
◽  
...  
Keyword(s):  
Arc Welding ◽  
Wire Electrode ◽  
Cored Wire ◽  
Exothermic Mixture ◽  
The Core ◽  
Core Composition ◽  
Flux Cored Arc Welding ◽  
Hydroabrasive Wear ◽  
Core Components

An important issue in the processes of strengthening and restoration of surfaces exposed to abrasive, abrasive-corrosive and hydroabrasive wear, using the process of self-protective flux-cored arc welding (FCAW), is to increase the productivity of hardfacing and the quality of the hardfacing metal. The literature review showed that one of the ways to increase the productivity of hardfacing and improve the quality of the hardfaced metal is to add an exothermic mixture to the core filler of flux-cored wire electrode. The effect of composition of filler core during FCAW on the fusion parameters, namely the addition of exothermic mixture (TM), the ratio of exothermic mixture components (CuO/Al), and the ratio of exothermic mixture oxidant to carbon content in the core composition (CuO/C) has been studied. It has been found that the optimum areas for the deposition rate (Gd), deposition factor (ad) and spattering factor (ψs) are observed for the following values of the core components: TM = 25…39, CuO/C = 5…6, CuO/Al = 3…4.

Measurement of Young’s Modulus and Shear Modulus of Some Structures Welded Using Flux Cored Wire by Vibration Tests

2014 ◽  
Vol 216 ◽  
pp. 151-156 ◽  
Author(s):  
Liviu Bereteu ◽  
Mircea Vodǎ ◽  
Gheorghe Drăgănescu
Keyword(s):  
Shear Modulus ◽  
Arc Welding ◽  
Natural Frequencies ◽  
Free Vibrations ◽  
Vibration Modes ◽  
Cored Wire ◽  
Flux Cored Arc Welding ◽  
Longitudinal Elastic Modulus ◽  
Vibration Tests ◽  
Non Destructive

The aim of this work was to determine by vibration tests the longitudinal elastic modulus and shear modulus of welded joints by flux cored arc welding. These two material properties are characteristic elastic constants of tensile stress respectively torsion stress and can be determined by several non-destructive methods. One of the latest non-destructive experimental techniques in this field is based on the analysis of the vibratory signal response from the welded sample. An algorithm based on Pronys series method is used for processing the acquired signal due to sample response of free vibrations. By the means of Finite Element Method (FEM), the natural frequencies and modes shapes of the same specimen of carbon steel were determined. These results help to interpret experimental measurements and the vibration modes identification, and Youngs modulus and shear modulus determination.

Microstructure, Mechanical and Corrosion Properties of UNS 32205 Duplex Stainless Steel Weldment Joints by Multipass FCAW

2021 ◽  
Vol 58 (6) ◽  
pp. 332-353
Author(s):  
A. Kisasoz ◽  
M. Tümer ◽  
A. Karaaslan
Keyword(s):  
Arc Welding ◽  
Weld Seam ◽  
Electrochemical Corrosion ◽  
Charpy Impact ◽  
Corrosion Properties ◽  
Cored Wire ◽  
Weld Joints ◽  
Flux Cored Arc Welding ◽  
Mechanical And Corrosion Properties ◽  
Stainless Steel Weldment

Abstract In this study, the effect of multipass welding on the microstructure, mechanical and corrosion properties of the UNS 32205 duplex stainless steels (DSS) is investigated. The UNS 32205 DSS is welded in 3 or 7 passes by flux-cored arc welding (FCAW) using E2209 T1 – 1/4 flux cored wire. The weldments are characterized by light optical microscopy (LOM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Feritscope analysis, Charpy impact tests and electrochemical corrosion tests. The results suggest that the multipass FCAW process induces the formation of γ2 in the weld seam. The mechanical and the corrosion properties of the weld joints are affected by the heat input variation and the phase transformations. Especially, the formation of the γ2 in the weld seam results in a decrease in the corrosion resistance of the joint samples.

A study on quality of weld in flux cored arc welding process

2014 ◽  
Vol 4 (1/2) ◽  
pp. 81
Author(s):  
Binoy K. Biswas ◽  
Asish Bandyopadhyay ◽  
Pradip K. Pal
Keyword(s):  
Arc Welding ◽  
Welding Process ◽  
Flux Cored Arc Welding ◽  
Arc Welding Process

scholarly journals Influence of the core filler composition on the recovery of alloying elements during the self-shielded flux-cored arc welding

2020 ◽  
Vol 9 (5) ◽  
pp. 10520-10528
Author(s):  
Bogdan Trembach ◽  
Aleksandr Grin ◽  
Nataliia Makarenko ◽  
Serhii Zharikov ◽  
Illia Trembach ◽  
...  
Keyword(s):  
Arc Welding ◽  
The Self ◽  
Alloying Elements ◽  
The Core ◽  
Flux Cored Arc Welding

Intellectual Capital Components, Measurement and Management

2010 ◽  
pp. 1-38
Author(s):  
Babak Sohrabi ◽  
Iman Raeesi ◽  
Amir Khanlari
Keyword(s):  
Knowledge Management ◽  
Intellectual Capital ◽  
Intangible Assets ◽  
Focus Of Attention ◽  
Competitive Edge ◽  
The Core ◽  
Organization And Management ◽  
Core Components ◽  
The Way

Intellectual Capital (IC) is neither a new phrase nor an old formally accepted term to measure the intangible assets of an organization. This concept has been used in different theories of organization and management. In the 1990s, the focus of attention dramatically changed from financial aspects and the techniques used for their measurement to the knowledge and intangible assets and the way businesses could manage them strategically in order to gain a competitive edge. By this way, IC has been recognized as one of the core components for managing and analyzing the strategic organizational intellectual capabilities, hence; to improve the quality of knowledge management (KM). The chapter aims to conceptually review and analyze the importance, definitions, components, and reporting mechanisms in the field of IC measurement and management.

scholarly journals Characteristic of Weld Bead By Using Flat Wire Electrode In GMAW Inline During The Process: An Experimental And Numerical Analysis

2021 ◽  
Author(s):  
K Sripri ◽  
M Ramu ◽  
P R Thyla ◽  
K Anantharuban ◽  
M Karthigha
Keyword(s):  
Steady State ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Butt Joint ◽  
Weld Bead ◽  
Wire Electrode ◽  
Molten Droplet ◽  
Metal Arc Welding ◽  
Steady State Temperature

Abstract This paper focusses on effect of flat wire electrode on gas metal arc welding (FW-GMAW) inline during the process to improve quality of weld bead. Since the flat wire electrode perimeter has enlarged, the turbulence of the molten droplet characteristics is altered due to the effect of electromagnetic force. To bring out, butt joint welding are proven with use of the flat wire electrode. The experimental results indicated that, the flat wire electrode and their orientations are significantly factors to improve the weld bead dimensions, due to the increased in steady state temperature and heat density. The end result also evident that the depth-to-width (D/W) ratio was improved on an average by 7.7 % than regular wire electrode used in GMAW. To validate, a comprehensive numerical model was developed, the result confirmed that the initial arc and steady state temperature are high for FW-GMAW. In addition, improvements in metallurgical and mechanical properties are discussed in this paper.

Effects of Preheating and Dual Shielding on Flux-Cored Arc Welded High-Strength Carbon Steel for Hardfacing Application

2020 ◽  
Vol 856 ◽  
pp. 112-118
Author(s):  
Chaiyanan Taengwa ◽  
Attaphon Kaewvilai
Keyword(s):  
Arc Welding ◽  
Welding Process ◽  
High Strength ◽  
Optical Microscope ◽  
Weld Penetration ◽  
Cored Wire ◽  
Flux Cored Arc Welding ◽  
Surface Durability ◽  
Protective Gas ◽  
Standard Grade

This work presented the hardfacing process of high-strength structural steel based on JIS G3106 standard grade SM490YA by semi-automatic flux-cored arc welding with a dual shielding process of flux-cored self-shielded and protective gas-shielded (FCAW-G). In the welding process, the surface of SM490YA specimen was hardfacing welded by metal cored wire based on chromium carbide which was in standard of 8555: E10-MF-65-G. The hardfacing welds from FCAW-G and traditional self-shielding FCAW (FCAW-S) with and without preheat were inspected by visual and penetrant tests for evaluating the welding quality. The macrostructure of the deposited layer was investigated by optical microscope and image analysis for analyzing the weld penetration and weld dilution. In addition, the hardness of the hardfacing welded specimens was tested for the evaluation of the surface durability of the welded SM490YA.

scholarly journals REPLACEMENT OF MANUAL GMAW WELDING BY FCAW SEMI-AUTOMATIC WELDING

2021 ◽  
Vol 2021 (2) ◽  
pp. 4342-4347
Author(s):  
MARIAN SIGMUND ◽  
◽  
TADEAS CICHA
Keyword(s):  
Carbon Steel ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Welding Parameters ◽  
Automatic Welding ◽  
Cored Wire ◽  
Metal Arc Welding ◽  
Flux Cored Arc Welding ◽  
Welding Procedure ◽  
Welding Processes

The article describes a replacement and benefits between manual gas metal arc welding (GMAW) with solid wire and semi-automatic flux-cored arc welding (FCAW) with metal flux-cored wire for a specific application of a welded steel compensator used for connecting piping systems to form larger units. For the replacement of the technologies and improvement of the welding efficiency and productivity a specific type of carbon steel mounting insert, DN300 PN16, was selected. Since these pressure parts are subject to the directive 2014/68/EU, both the welding processes have to meet the same welding quality requirements. In particular, they are the welding procedure qualification report (WPQR) and the welder’s or welding operator’s qualification in accordance with valid European standards. Based on this requirement, a sample was selected so that it would cover the widest possible range of carbon steel mounting inserts produced. This article describes the whole experiment including the selection of the right equipment and filler material, finding the ideal welding parameters, and the subsequent qualification of the welding procedure and the operator with emphasis on the largest possible increase in the welding speed and productivity for these specific weldments.

scholarly journals Innovation of Biomass Crusher by Application of Hardfacing Layers

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1283
Author(s):  
Ján Viňáš ◽  
Janette Brezinová ◽  
Jakub Brezina ◽  
Peter Hermel
Keyword(s):  
Service Life ◽  
Arc Welding ◽  
Metallographic Analysis ◽  
Wire Electrode ◽  
Internal Defects ◽  
Welding Method ◽  
Functional Surfaces ◽  
Manual Arc Welding

This paper presents the innovation possibilities of the crushers functional parts and the results of layers’ renovation analyses of the surfaces worn by biomass crusher hammers. The worn functional surfaces of hammers made of Hardox 400 material were renovated by manual arc welding method (welded with a filled wire electrode with its own protection). As an additive material, Lincore 60-O tubular wire from Lincoln Electric was used. The quality of weld layers was assessed on the metallographic sections, where the presence of internal defects was monitored, and the microstructures of welds were identified. In addition to the metallographic analysis, the microhardness in terms of EN ISO 9015-2 was assessed. Based on the performed experiments, it is suitable for the crusher innovation to recommend the chain replacement with a shaped weldment made of Hardox 400 material, the weldability of which is very good, and to make at least one hardfacing layer on its functional surfaces. With this innovation, the service life of the crushing segment could be extended by more than ten-fold.

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