The Comparative Analysis of the Concentration of Microparticles during Mechanized MAG Welding Using Cored Wires

2013 ◽  
Vol 814 ◽  
pp. 76-81
Author(s):  
Dănuţ Mihailescu ◽  
Octavian Frincu ◽  
Marius Corneliu Gheonea
Keyword(s):  
Carbon Dioxide ◽  
Comparative Analysis ◽  
Welding Process ◽  
Mag Welding ◽  
Gas Mixture ◽  
Metal Powders ◽  
Shielding Gas ◽  
Cored Wire ◽  
Metal Frame ◽  
Cored Wires

Use of cored wire - shielding gas (gas mixture) pair, during mechanized MAG welding, causes the microparticles formation which is harmful for the welder’s health. The paper presents the experimental method for determining the concentration of the microparticles generated during MAG welding when rutile cored wires (standard and low fume emission) and metal powder cored wires (standard and low fume emission) are used. Carbon dioxide and the shielding gas mixture are investigated, too. Four types of cored wires were comparatively analysed, when three wire speed values were applied. The research of the microparticles concentration was conducted after each welding bead deposition, at the upper part of the welding enclosure, using MicroDust Pro particulate monitor. After each weld bead was deposited, the metal frame of the welding enclosure was removed, and, the fumes and gases, produced during the welding process, were eliminated through two fans, positioned inside and outside of the equipment. Using rutile cored wire with low fume emission, a decrease of microparticles concentration up to 30% is noticed in comparison with standard rutile cored wire. Using metal powders cored wire with low fume emission, the microparticles concentration is diminished with 12.5% comparing with standard metal powders cored wire.

The Comparative Analysis of Gas Emissions during Mechanized MAG Welding Using Cored Wires

2013 ◽  
Vol 814 ◽  
pp. 82-86
Author(s):  
Dănuţ Mihailescu ◽  
Octavian Frincu ◽  
Marius Corneliu Gheonea
Keyword(s):  
Carbon Dioxide ◽  
Comparative Analysis ◽  
Experimental Method ◽  
Metal Powder ◽  
Mag Welding ◽  
Gas Mixture ◽  
Shielding Gas ◽  
Cored Wire ◽  
Gas Emissions ◽  
Cored Wires

The use of cored wire - shielding gas (gas mixture) pair, during mechanized Metal Active Gas - MAG welding, leads to the formation of gas emissions (CO2, CO, NOx, NO, O3 etc) which is harmful for the welder’s health. The paper addresses the experimental method applied to establish the gas emissions developed during MAG welding when rutile cored wires (standard and low fume emissions) and metal powder cored wires (standard and low fume emissions) are used. Carbon dioxide and the shielding gas mixture are investigated, too. Four types of cored wires were comparatively analysed, when three wire speed values were applied. The experimental results have revealed that using rutilic cored wires and increasing the speed feed, an augmentation of CO (ppm), constant values of O2 (%), insignificant constant values of NO (ppm) and NOx (ppm) and absence of CO2 (%) are achieved. Using metal cored wires and increasing the speed feed, increase of CO (ppm), insignificant values of NO (ppm) and NOx (ppm), and constant values of CO2 (%) and O2 (%) are noticed.

Influence of Shielding Gas and Wire Type on the Microparticles Size Generated during MAG Welding Process

2015 ◽  
Vol 809-810 ◽  
pp. 461-466
Author(s):  
Marius Corneliu Gheonea ◽  
Danut Mihailescu ◽  
Elena Scutelnicu
Keyword(s):  
Metal Powder ◽  
Welding Process ◽  
Experimental Tests ◽  
Mag Welding ◽  
Experimental Program ◽  
Welding Fumes ◽  
Shielding Gas ◽  
Microscopy Method ◽  
The One ◽  
Cored Wires

Exposure of welders to welding fumes and microparticles produced during electric welding can be dangerous and may cause serious maladies. It is important to understand the formation mechanism of microparticles generated during welding process on the one hand and the methods to diminish the risk on the welder’s health on the other hand. Experimental research results related to the assessment of microparticles size, generated during MAG welding process, are presented and discussed in detail in this paper. Rutile flux-cored and low fume metal powder cored wires with 1.2 mm diameter in combination with CO2 shielding gas or M21 gas mixture (Corgon 18) have been used in the investigations. The experimental tests were performed in a special enclosure, equipped with Glass Fiber Filters and a Philips vacuum, with the aim to capture the microparticles developed by the MAG welding process. The microparticles collected during the experimental program have been analysed and measured by electron microscopy method with (SEM/ESEM - EDAX) Quanta 200 microscope. The study showed that low fume metal powder cored wires determined the achievement of smaller microparticles in comparison with rutile flux-cored wires. Finally, several conclusions emerged from the findings of this study are synthetically presented.

Effect of Gas Metal Arc Welding Parameters on Mechanical Properties for Carbon Steel ASTM A285 Grade A

2011 ◽  
Vol 341-342 ◽  
pp. 16-20
Author(s):  
Mongkol Chaisri ◽  
Prachya Peasura
Keyword(s):  
Carbon Dioxide ◽  
Tensile Strength ◽  
Carbon Steel ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Welding Process ◽  
Welding Parameters ◽  
Shielding Gas ◽  
Metal Arc Welding ◽  
Arc Welding Process

The research was study the effect of gas metal arc welding process parameters on mechanical property. The specimen was carbon steel ASTM A285 grade A which thickness of 6 mm. The experiments with full factorial design. The factors used in this study are shielding gas and voltage. The welded specimens were tested by tensile strength testing and hardness testing according to ASME boiler and pressure vessel code section IX 2007. The result showed that both of shielding gas and voltage had interaction on tensile strength and hardness at 95% confidential (P value < 0.05). Factors affecting the tensile strength are the most carbon dioxide and 27 voltage were tensile strength 213.43 MPa. And hardness maximum of 170.60 HV can be used carbon dioxide and 24 voltage. This research can be used as data in the following appropriate parameters to gas metal arc welding process.

Determining the Coefficients of Fusion and of Weld Deposition at Mechanized Mag-C Welding with Solid Wire and Cored Wires

2014 ◽  
Vol 657 ◽  
pp. 301-305 ◽  
Author(s):  
Dănuţ Mihăilescu ◽  
Marius Cornel Gheonea ◽  
Bogdan Georgescu
Keyword(s):  
Working Conditions ◽  
Welding Process ◽  
Metallic Powder ◽  
Mag Welding ◽  
Basic Flux ◽  
Air Control ◽  
Self Protection ◽  
Cored Wires ◽  
Welding Materials ◽  
Noxious Substances

In the case of the MAG welding of carbon and low-alloyed steels wires or hollow wires with (rutilic or basic) flux with metallic powder or self-protection are used. In indoors weldings huge quantities of smoke, gases, dust and particles in suspension, etc. get accumulated. These noxious substances produced during the welding process may severely affect the welders health. To improve the welders working conditions, on an international scale, the following are used: welding masks with self-obscurazation and air control; noxious substances vacuum cleaners fitted with filters; MAG welding pistols with gase and smoke absorbing devices. For the improvement of the welders working conditions, producers of welding materials invented hollow wires with (rutilic flux or with metallic powder) with a smoke-reduced emission [1,2,3,4,5].

The Technological Comparative Analysis between the Vertical MAG Welding with Solid Wire and with Cored Wire

2015 ◽  
Vol 1128 ◽  
pp. 199-208
Author(s):  
Mircea Burcă ◽  
Radu Cristian Seculin ◽  
Daniel Țunea
Keyword(s):  
Short Circuit ◽  
Welding Process ◽  
Good Control ◽  
Point Of View ◽  
Steel Plates ◽  
Mag Welding ◽  
Core Wire ◽  
Metal Bath ◽  
Cored Wire ◽  
Economical Analysis

The vertical welding is generally considered difficult because of the danger of the flow of the melting bath and the melted slag under the action of gravity. In the case of the MIG/MAG welding process, the technological measurements that are being regarded in the ascending and descending of the vertical welding refer to: the use of transfer modes through short circuit and pulsed current, the use of core wires instead of solid wires, the crossing from the semi-mechanized to automatic or robotical welding, that allows the use of complex radial oscillation systems, that assure a good control of the metal bath. The paper wants to make a comparative technological and economical analysis between the vertical ascendent MAG welding using solid wire or core wire. The advantages that are being presented are for the use of the core wire with a rutilic core for the vertical, ascendent welding from a technological, qualitative and economical point of view in the mechanical corner welding process of a 10 mm thickness steel plates.

Investigation on CO and Microparticles Concentrations Produced in MAG-M Welding Process

2015 ◽  
Vol 809-810 ◽  
pp. 455-460 ◽  
Author(s):  
Danuţ Mihailescu ◽  
Marius Corneliu Gheonea ◽  
Elena Scutelnicu
Keyword(s):  
Metal Powder ◽  
Welding Process ◽  
Fusion Welding ◽  
Feed Speed ◽  
Shielding Gas ◽  
Cored Wire ◽  
Environment Quality ◽  
Basic Flux ◽  
Wire Feed Speed ◽  
Welding Processes

It is well known that CO and microparticles generated during GMAW welding processes can affect the welder's health and the environment quality and should be avoided. The main goal of the research was to quantitatively assess the concentrations of CO and microparticules resulting through melted wire - shielding gas - welding pool interaction, specific to fusion welding process, in particular MAG-M (Metal Active Gas with Corgon shielding gas)) process. The concentrations of microparticles and emission of CO developed by several combinations of filler metal and shielding gas, such as ordinary solid wire, basic flux-cored wire, rutile flux-cored wire, metal powder cored wire, low fume metal powder cored wire and Corgon 18, as shielding gas mixture, have been monitored and investigated in detail. The experimental data, achieved for different wire feed speed values, were collected by using special devices as Multilyzer NG and MicroDust Pro and further processed, plotted and comparatively analysed. The analysis revealed that the low fume rutile flux-cored wire significantly developed lower concentrations of microparticles and CO, in comparison with the other types of wires used in MAG-M welding process, and a better protection of the environment would be achieved. Important conclusions related to the influence of the wire type on the concentrations of CO and microparticles produced during MAG-M welding process have been drawn and some recommendations useful for the producers of welded structures are provided at the end of the paper.

Mechanized Welding with Metal Cored Wire

2020 ◽  
Vol 1157 ◽  
pp. 113-122
Author(s):  
Andrey A. Golyakevich ◽  
Leonid N. Orlov ◽  
Sergey Yu. Maksimov
Keyword(s):  
High Performance ◽  
Welding Process ◽  
Global Market ◽  
Cored Wire ◽  
Global Trends ◽  
Wide Range ◽  
Mechanized Welding ◽  
The Stability ◽  
Welding Consumables ◽  
Cored Wires

Currently, there is a steady upward trend in the consumption of flux-cored wires in the global market of welding consumables. One of the rapidly developing technologies for the manufacture of metal structures is shielded gas arc welding with flux-cored wire with a metal core. According to the technology of use, metal cored wires do not differ from solid wires, and even surpass them in some technological characteristics. Taking into account global trends in the development of mechanized welding and the lack of domestic analogues, LLC TM.VELTEK has developed and mastered the manufacturing of high-performance metal cored wire TMB5-MK for welding in mixtures of 82% Ar + 18% CO2, 90% Ar + 10% CO2. The research aimed to study the features of the process of welding with metal cored wire compared to welding with solid wire. It has been established that metal cored wire provides high stability of arc burning in a wide range of welding modes. When welding at the same conditions in the optimal range, the index of stability of arc burning when using solid wire Sv-08G2S is 3 times lower. At the same time, the TMV5-MK wire provides a reduction in spatter losses, an increase in welding productivity and high mechanical properties of the weld metal. It is shown that the stability of the welding process is significantly affected by the electrodynamic properties of the power source and this factor must be taken into account when evaluating the welding and technological properties of welding wires and developing recommendations for their use.

Rail surfacing repairing technique with self-shielded flux-cored wires

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040056
Author(s):  
Jia Chen ◽  
Guoqing Gou ◽  
Zhongyin Zhu ◽  
Wei Gao
Keyword(s):  
Heat Treatment ◽  
Process Parameters ◽  
Great Influence ◽  
Welding Process ◽  
Welding Parameter ◽  
Post Heat Treatment ◽  
Cored Wire ◽  
Preheating Temperature ◽  
Welding Defects ◽  
Cored Wires

A newly self-protecting flux-cored wire was used for simulated U75V rail repairing and five welding process parameters were applied. The influence of welding parameter on the hardness and microstructure of the wire and solder layers was investigated. The single-pass welding process with different preheating parameters and post-treatment parameters were also taken into research. The results showed that the welding process parameters have a significant influence on the weld quality, and mismatched parameters will increase the welding defects. The number of welding layers has a great influence on the hardness and structure. Increasing preheating temperature and a post-heat treatment at a high-temperature can enhance the hardening effect.

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