Use of a Reductive Carbon Monoxide Atmosphere in Arc Welding of Microalloyed Steels

Ivanaysky, E. A.; Ишков, А. В.; Ivanaysky, A. A.

doi:10.4028/www.scientific.net/msf.945.543

Cited by 3 publications

(2 citation statements)

References 5 publications

(3 reference statements)

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“…During gas metal arc welding in the CO 2 shielding gas, CO 2 dissociates to CO and O 2 in the arc since its dissociation degree significantly rises at 2000 K [37]. CO reacts with the plasma in the arc [38,39], and since CO ionization energy is higher than that of CO 2 , the arc voltage increases and hence the arc current.…”

Section: Resultsmentioning

confidence: 99%

“…Since the chemical equilibrium of reactions ( 3) and ( 4) in a CO 2 shielding gas is shifted towards the formation of CO and the temperature near the cathode spot around 3300 K boosts the dissociation of CO 2 [37], CO accounts for the largest share of the gas formed. Since the amount of released oxygen and formed CO 2 is equal, accounting that there is always more than enough carbon, the amount of CO, generated from the coating during welding, can be calculated using formula:…”

Section: Resultsmentioning

confidence: 99%

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The Coatings Breakdown Products Influence on the Gas Metal Arc Welding Parameters

et al. 2020

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The installation and renovation works of steel structures are often performed using gas metal arc welding. Thereby, the welded elements of these structures are frequently protected by a variety of primers and coatings, especially in shipbuilding. Complex nonequilibrium physical and chemical processes occurring under the influence of high temperatures and electric arc discharge, as well as the presence of the products that affect the welding parameters, have a significant impact on the joints’ quality. Experimental studies on the coatings’ breakdown products influence on the gas metal arc welding parameters were performed with epoxy, alkyd, polyacrylate, polyvinyl butyral primers, epoxy zinc filled, vinyl chloride, vinyl isobutyl, and organosilicate coatings. The peculiarity of welding current waveform parameters was studied using oscillograms processing. It was found that the main coatings breakdown products that influence the current waveform are oxygen and carbon monoxide.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The Coatings Breakdown Products Influence on the Gas Metal Arc Welding Parameters

et al. 2020

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Development of Mechanized Arc Welding Technology for High-strength Reinforcing Steel in a Reductive Carbon Monoxide Atmosphere

Ivanaysky¹,

Ишков²,

Ivanaysky³

2020

IOP Conf. Ser.: Mater. Sci. Eng.

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Modern methods of welding high-strength reinforcing steels were analyzed. Comparative studies of welded joints obtained using manual arc welding and welding in a reducing atmosphere of carbon monoxide were carried out. A chemical and metallographic analysis of welded joints was performed. It has been established that welded joints of microalloyed steels made at low temperatures may have reduced strength and viscous properties. The possibility of making welded steel joints using highly-efficient arc welding in a reducing medium of carbon monoxide was investigated. Welding modes have been selected to ensure the formation of a quality welded joint. Studies showed that the use of the proposed welding method in a reducing medium of carbon monoxide ensures full strength of the welded joint and the base metal.

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The effect of gas atmosphere on the coating formation by electric arc surfacing with cermet SHS electrodes of the TiB2–Co2B composition

Zhidovich

Столин

Чижиков

et al. 2021

JAMT

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Due to their unique properties, metal-matrix composite materials, when used as a surfacing material for electric arc surfacing, provide high properties of the deposited layers. SHS-extrusion is a promising method for a wide range of surfacing metal-matrix electrodes. The gas environment of surfacing affects the quality of coatings formed by SHS electrodes, their microstructure and properties. In this paper, cermet SHS electrodes of the TiB2–Co2B composition obtained by SHS-extrusion were used to form protective coatings on a steel substrate by electric arc surfacing in an argon atmosphere and in a nitrogen atmosphere. The elemental and phase composition, as well as the microstructure of the deposited layers, were investigated. Based on the conducted studies, the influence of the gas atmosphere on the formation of the structure of cermet coatings was established. It is shown that, despite the similar phase composition, there are fundamental differences in the microstructures of the deposited coatings, which are caused by the partial fusion of the tungsten electrode and the transfer of the electrode material in the coating during surfacing in an argon atmosphere. The maximum values of the microhardness of coatings deposited in a nitrogen atmosphere exceed the maximum microhardness of coatings obtained by surfacing in an argon atmosphere by 200–450 HV.

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Use of a Reductive Carbon Monoxide Atmosphere in Arc Welding of Microalloyed Steels

Cited by 3 publications

References 5 publications

The Coatings Breakdown Products Influence on the Gas Metal Arc Welding Parameters

The Coatings Breakdown Products Influence on the Gas Metal Arc Welding Parameters

Development of Mechanized Arc Welding Technology for High-strength Reinforcing Steel in a Reductive Carbon Monoxide Atmosphere

The effect of gas atmosphere on the coating formation by electric arc surfacing with cermet SHS electrodes of the TiB2–Co2B composition

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