Review on Shielding Gases for Mag Welding of Mild Steel
12th International Symposium "Powder Metallurgy: Surface Engineering, New Powder Composite Materials. Welding": Proceedings 2021
Didzis Avišāns, Irīna Boiko

Steel production has been a significant field of manufacturing during the last centuries. A lot of technologies have been used and implemented to join two metal parts together to make a complete construction. One of these technologies is welding. Welding has taken an essential part in steel manufacturing during the second part of the 20th century. Therefore, many different welding technologies have been implemented, each differing from the other by their properties and application. Today most widely used technology in steel construction manufacturing is MAG (Metal Active Gas) welding because of its flexibility and fast welding speed. Several factors influence processes in MAG welding. Steel properties and chemical content is the main component that is observed if looking on weldability of metals. The filler material used in MAG welding can influence the process, equipment behaviour, spatters and welding joint properties. One of the most critical components in the welding process is shielding gas, but it is not considered an issue sometimes as its main task is to prevent oxygen from getting into the welding zone. There have been developed a different kind of shielding gases for mild steel during the last half of the 20th century. The first shielding gas used in MAG welding was CO2 implemented by Lyubavski and Novoshilov in 1953. Almost ten years later, in the 1960s, a small amount of oxygen was mixed with CO2, which helped provide a spray-type arc transfer. It took thirty years till the new generation of shielding gases was made as new technologies like on-board computers, robots, and highly sophisticated electrodes were implemented in MAG welding processes. There are different mixtures of gases available in the market today, and sometimes it’s hard to decide which one should be used in the welding processes. This paper will include an analysis of the latest research in shielding gas influences on MAG welding process. A short overview of the latest welding equipment used in MAG welding influences the behaviour of shielding gases in the MAG process.


Keywords
mild steel, MAG welding, shielding gas, microstructure

Avišāns, D., Boiko, I. Review on Shielding Gases for Mag Welding of Mild Steel. In: 12th International Symposium "Powder Metallurgy: Surface Engineering, New Powder Composite Materials. Welding": Proceedings, Belarus, Minsk, 7-9 April, 2021. Minsk: Belarusskaya Navuka, 2021, pp.314-324. ISBN 978-985-08-2709-8.

Publication language
English (en)
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