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To the Question about the Source of Ozone in MAG Welding Using Carbon Dioxideстатья
Информация о цитировании статьи получена из
Scopus
Дата последнего поиска статьи во внешних источниках: 1 декабря 2021 г.
- Авторы: Protopopov Evgeny, Devyatkina Vera, Dobrykh Syuzanna, Korotkov Kirill, Valter Alexander, Protopopov Alexander
- Журнал: International Journal of Engineering Research and Technology
- Том: 12
- Номер: 5(219)
- Год издания: 2019
- Первая страница: 658
- Последняя страница: 661
- Аннотация: In this paper, we have considered the formation of ozone inarc welding in a protective atmosphere with carbon dioxideadditives. It is a commonly shared view that ozone is formedin the air under the influence of ultraviolet radiation of the arc.But, at the MAG process, using carbon dioxide ozone isreleased intensively at the beginning of welding, and then theintensity of its release is significantly reduced. This indicatesthat in the case, another source of ozone is present and islocated in the welding arc; to identify it,we calculated themass composition of the products of thermal dissociation ofcarbon dioxide in the temperature range from 300 K to 20000K. It was found that molecular oxygen is formed bydecomposition of carbon dioxide in the temperature rangefrom 1800 K to 4800 K. At temperature 3600 K, theconcentration of molecular oxygen is about 17 wt.% inproducts of thermally dissociating carbon dioxide. As a result,the condition is created for the formation of ozone in thewelding arc when the plasma temperature are building andreaches about 3600 K when the arc is ignited. The resultingozone passes into the gaseous component of the weldingaerosol. Along with the formation of ozone in the air, thisprocess determines conditions of ozone emission into theenvironment when the arc is excited. This fact must be takeninto account when designing ventilation of welding workswhen designs having a significant number of short welds arewelded MAG process or pulsed gas metal arc welding usingcarbon dioxide is applied.
- Добавил в систему: Добрых Сюзанна Сергеевна