The Influence of Shielding Gas Flow Rate on the Transfer Frequency of Electrode Metals Drops

Chinakhov, D. A.; Grigorieva, E. G.; Mayorova, E.I.; Kartsev, D S

doi:10.1088/1757-899x/142/1/012005

Cited by 11 publications

(11 citation statements)

References 6 publications

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“…In connection with the perception stamp alternating loads at high temperatures endurance limit determined by the method specified in [16,[20][21][22]. Samples were made of a longitudinal section of die blocks investigated after heat treatment: quenching in oil at 1150 K, and tempering at 680 K.…”

Section: Experiments and Discussionmentioning

confidence: 99%

The Sectors Workpieces and Drum Reel’s Die Cubes Electroslag Casting with Exothermic Electrical Conductive Fluxes

Vlasov

Makarenko

Kushchii

et al. 2021

SSP

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It has been established that the developed method of manufacturing workpieces for the sectors of the drums of X20CrMoWV3 steel reel’s and die cubes from X5CrNiMo steel using a solid start and exothermic flux significantly reduces the complexity of their manufacture. The cast reel’s drum sectors workpieces and die cubes, obtained by the electroslag remelting (ESR) method, had a smooth surface without corrugations, sinkers, and slag inclusions. Heat treatment provides the required mechanical properties and the absence of flocs in the cast electroslag metal. An effective way to increase the performance of electroslag processes is using the exothermic flux, which contain scale, ferroalloys, aluminum powder and standard flux (welding flux ISO 14174 – S F AF3, etc.) in quantities sufficient for the exothermic reactions to occur, which ensures the generation of additional heat in the starting period of electroslag processes and contributes to the accelerated induction of the slag bath of the required volume at the “solid” start both monofilar and bifilar schemes of conducting the process instead of the “liquid” start. Electroslag processes using an exothermic alloyed flux on a “hard” start allow to obtain (compared to existing methods of slag bath formation) an increasing in the output of a suitable metal 2...10 %; saving on melting 1 kg of standard flux 1.2...1.4 kW h; reducing of the starting time of the ESR process to 25 %.

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Section: Experiments and Discussionmentioning

confidence: 99%

The Sectors Workpieces and Drum Reel’s Die Cubes Electroslag Casting with Exothermic Electrical Conductive Fluxes

Vlasov

Makarenko

Kushchii

et al. 2021

SSP

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“…Two-jet shielding employs two coaxial jets of one gas and one common chamber. In this case, the external annular gas flow presses the gas front reflected from the surface of the workpiece to be welded [4,28]. Thus, the formed shielding gas flow becomes more stable and covers the maximum of the welded product surface.…”

Section: Methodsmentioning

confidence: 99%

“…Two-jet gas shielding during consumable electrode welding [4,25,28] ensures the stability of the internal jet of the supplied gas, reliable welding zone shielding, and reduces eddies in the HAZ. Controlling the dynamic impact of the internal shielding gas jet on the processes in the welding zone changes the heat and mass transfer processes in the welding zone and results in the intensive mixing of the molten electrode metal with the base metal in the weld pool.…”

Section: Methodsmentioning

confidence: 99%

“…To assess the change in heat distribution and thermal cycle on the surface of welded joints from the conditions of gas shielding (CO 2 ) during consumable electrode welding, experiments were carried out using ThermaCAM P65HS thermal imaging equipment from FLIR Systems (USA). Two-jet gas shielding during consumable electrode welding [4,25,28] ensures the stability of the internal jet of the supplied gas, reliable welding zone shielding, and reduces eddies in the HAZ. Controlling the dynamic impact of the internal shielding gas jet on the processes in the welding zone changes the heat and mass transfer processes in the welding zone and results in the intensive mixing of the molten electrode metal with the base metal in the weld pool.…”

Section: Methodsmentioning

confidence: 99%

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The Influence of Two-Jet Gas Shielding Parameters on the Structure and Microhardness of Steel 45 Joints during Consumable Electrode Welding

Chinakhov

2023

Metals

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The paper presents the study results of the parameters influence of arc welding with a consumable electrode with two-jet gas shielding in CO2 on the structure and microhardness of high-strength steel 45 welded joints with slotted edges. Controlling the dynamic impact of the internal shielding gas jet on the processes in the welding zone changes the heat and mass transfer processes in the welding zone and results in the intensive mixing of the molten electrode metal with the base metal in the weld pool. The results of the studies determined the dynamic effect of the active shielding gas jet on the structure and microhardness of multilayered steel 45 welded joints with slotted edges using the method of full factorial experiment, developed dependences of chemical elements (carbon, silicon, manganese) content in the weld metal of multilayered steel 45 welded joints on the controlled parameters of the welding mode (Q, Iw, U). Due to uneven heat introduction into each of the welded plates during edge slotting, the asymmetric distribution of microhardness in the cross sections of welded joints relative to the weld axis indicates some differences in the structure and properties of the heat-affected zone (HAZ) and the weld. According to the results of the studies, consumable electrode arc welding with two-jet gas shielding provides faster distribution and equalization of heat on the product surface and reduces its instantaneous overheating, which improves the structural phase state of the welded joint made of steel 45 and reduces the microhardness gradient in the HAZ. An increase in the heat input of welding (a simultaneous increase in the welding current and voltage of the welding arc) leads to a decrease and smoothing of the microhardness peak in the HAZ.

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“…Pores formation makes the weldment more susceptible to corrosion damages and gives poor mechanical strength. Chinakhov et al (2016) researched on the influence of shielding GFR on the transfer frequency of electrode metals drops. It was found that GFR plays a significant on the chemical composition and properties of the weld joints.…”

Section: Introductionmentioning

confidence: 99%

Investigation of mechanical properties and parametric optimization of the dissimilar GTAW of AISI 304 stainless steel and low carbon steel

Ogedengbe

Abioye

Ekpemogu

2018

WJE

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Purpose The purpose of this study is to conduct gas tungsten arc dissimilar welding of AISI 304 stainless steel and low carbon steel within a process window so as to investigate the effects of current, speed and gas flow rate (GFR) on the microstructure and mechanical properties of the weldments. Design/methodology/approach The welding experiment was carried out at different combinations of parameters using WN-250S Kaierda electric welding machine. A combination of scanning electron microscopy and energy dispersive X-ray spectroscopy was used to examine the microstructure of the weldments. Micro-hardness and tensile tests were performed using Vickers hardness tester and Instron universal testing machine, respectively. ANOVA was used to analyze the significance of the parameters on the mechanical properties. Findings The microstructure of the weld region is characterized with dendritic structure with the existence of ferrite and austenite phases. The utilized parameters show significant effects on the ultimate tensile strength (UTS) of the weldments. The current and GFR were found to be the most and least significant factors, respectively. Both the grain size and weld penetration contributed to the UTS of the weldments. The UTS (427-886 MPa) increased with decreasing current and welding speed. In all samples, the weld region exhibited higher hardness (297-396 HV) than the HAZ in the base metals (maximum of 223 Â ± 6 HV). All the three factors show significant effect with the welding speed contributing mostly to the hardness of the weld region. Originality/value The parametric combination that gives the optimum mechanical performance of the dissimilar gas tungsten arc weldments of AISI 304 stainless steel and low carbon steel was established.

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The Influence of Shielding Gas Flow Rate on the Transfer Frequency of Electrode Metals Drops

Cited by 11 publications

References 6 publications

The Sectors Workpieces and Drum Reel’s Die Cubes Electroslag Casting with Exothermic Electrical Conductive Fluxes

The Sectors Workpieces and Drum Reel’s Die Cubes Electroslag Casting with Exothermic Electrical Conductive Fluxes

The Influence of Two-Jet Gas Shielding Parameters on the Structure and Microhardness of Steel 45 Joints during Consumable Electrode Welding

Investigation of mechanical properties and parametric optimization of the dissimilar GTAW of AISI 304 stainless steel and low carbon steel

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