Combined pulsed effect of shielding gases and welding current in consumable electrode welding

Zhernosekov, A.M.; Sidorets, V.N.; Shevchook, S.A.

doi:10.1080/09507116.2014.884326

Cited by 7 publications

(4 citation statements)

References 1 publication

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“…Zhernosekov et al [32] investigated the combined effect of shielding gases on the welding current and filler wire. A GMAW process was used to weld low-alloy steel by alternating pulsed and direct current welding.…”

Section: Electrode Effect On the Shielding Gas Controlmentioning

confidence: 99%

Effects of shielding gas control: welded joint properties in GMAW process optimization

Mvola

Kah

2016

Int J Adv Manuf Technol

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One function of shielding gases used in welding processes, such as hydrogen (H 2 ), oxygen (O 2 ), carbon dioxide (CO 2 ), nitrogen (N 2 ), helium (He), argon (Ar) and their mixtures, is protection of the weld pool against harmful contamination that could generate defects. In addition to this primary function, shielding gases significantly affect the shape of the weld, weld geometry, seam appearance, metallurgical and mechanical properties, welding speed, metal transfer, arc stability or beam and fume emissions. The shielding gas is thus a key factor in determining weld joint properties and welding process efficiency. As welding processes have become enhanced and welding research has advanced, different combinations of shielding gas mixtures have become available under a wide variety of trademarks, each claiming to offer the best efficiency. The shielding gas flow rate in GMAW welding is usually set according to empirical experiment. The flow generally remains unchanged throughout the entire welding process and is set at maximum values of the welding parameters so that there is sufficient gas cover. This setting means, however, that unnecessarily large quantities of shielding gas may be consumed in other phases of the welding process. In view of constantly increasing prices and shortfalls in helium supply, there is a need to optimize the use of shielding gas. Consequently, an ability to closely monitor the shielding gas blend and reduce waste can provide valuable cost savings. This paper examines the effects of shielding gas mixtures and their components, presents a cross-comparison of shielding effects in fusion welding and suggests guidelines for adaptive controllability of shielding gas in advanced adaptive fusion welding. The study reviews scientific case studies and experiments from the point of view of the effect of the shielding gas on the process efficiency and process outcome. The study considers shielding gases for welding of both ferrous metals (i.e. carbon steels, stainless steels, high-strength steels) and non-ferrous metals (i.e. aluminium and its alloys, nickel and its alloys and copper and its alloys). Appropriate choice of shielding gas and use of an optimum flow rate results in better quality in terms of increased productivity, reduced gas consumption and improved weld geometry properties, microstructure and mechanical properties. Although some blends can be used effectively in many different processes, other blends appear process-dependent; they produce far poorer results when utilized in non-appropriate processes. Particle image velocimetry (PIV) and Schlieren techniques can be used for visual sensing of gas flow during fusing welding. Moreover, an adaptive alternative gas supply can improve welding performance and weld quality and reduce harmful fume emission.

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Section: Electrode Effect On the Shielding Gas Controlmentioning

confidence: 99%

Effects of shielding gas control: welded joint properties in GMAW process optimization

Mvola

Kah

2016

Int J Adv Manuf Technol

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“…The authors of works [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] researched the effect of changing shielding gas flows on the consumable electrode welding process and noted that an increase in the gas outflow rate improves the quality of the welding zone shielding, the formation of the weld, and the stability of the welding process.…”

Section: Introductionmentioning

confidence: 99%

“…The shielding gas supply rate affects the transfer of electrode metal droplets and contributes to the separation and transfer of droplets to the weld pool. The authors of [18,19] suggest that the control of shielding gas dynamics is a promising method for improving the technology of consumable electrode welding in shielding gases. Some studies offer using small diameter nozzles for narrow gap welding while maintaining the recommended gas flow rate for standard torches [14][15][16][17] with two-layer shielding using two different gases (Ar, CO 2 ) [12,24] or two-jet gas shielding, which requires two coaxial jets of one gas and one common chamber [4,25].…”

Section: Introductionmentioning

confidence: 99%

“…The authors of works [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] investigated how shielding gas flow dynamics affected consumable electrode welding processes and discovered that an increase in the gas flow rate from the welding nozzle improves the quality of the welding zone shielding and the formation of the weld seam, as well as increases the stability of the welding process. A decrease in the electrode wire stick-out increases the microhardness because the density and flow rate of the shielding gas also increase (at a constant flow rate), which in turn increases the cooling rate of the metal under the welding nozzle and thus the microhardness in the HAZ.…”

Section: Introductionmentioning

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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The influence of TIG-Arc physical characteristics on the penetration and weld width under different Ar and He supply conditions

2018

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Combined pulsed effect of shielding gases and welding current in consumable electrode welding

Cited by 7 publications

References 1 publication

Effects of shielding gas control: welded joint properties in GMAW process optimization

Effects of shielding gas control: welded joint properties in GMAW process optimization

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

The influence of TIG-Arc physical characteristics on the penetration and weld width under different Ar and He supply conditions

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