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How do different types of atmospheric gases affect the process of welding and the resulting microstructure?

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Different types of atmospheric gases significantly impact the welding process and resulting microstructure. For instance, shielding gases like argon, nitrogen, carbon dioxide, and carbon monoxide play crucial roles in welding various materials. The choice of gas can affect mechanical properties, corrosion resistance, and microstructure of weld joints. Nitrogen, when used as a post-weld heat treatment atmosphere, can lead to nitride precipitates affecting corrosion resistance negatively. On the other hand, carbon monoxide as a shielding gas can create a reducing atmosphere, enabling the attainment of a chemical composition close to the base metal. Understanding the influence of different atmospheric gases is vital for achieving high-quality weldments and ensuring the durability and reliability of welded components.

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Journal Article•DOI Influence of shielding gases in the welding of metals Paul Kah, Jukka Martikainen - Show less +1 more 01 Feb 2013-The International Journal of Advanced Manufacturing Technology 80 Citations	Different types of shielding gases influence welding by protecting molten metal from atmospheric contamination, affecting arc characteristics and weld microstructure, as highlighted in the study.
Journal Article•DOI Quenching heat treatment effects on the mechanical and microstructure properties of AISI 304 type welded by GMAW process using different shielding gases Rasdi Deraman, M.N. Berhan - Show less +1 more 01 Dec 2013-Applied Mechanics and Materials 3 Citations	Different shielding gases, such as 68% Argon plus 32% CO2 and 100% Argon, impact welding strength. Quenching heat treatment slightly decreases hardness in AISI 304 type welded samples.
Book Chapter•DOI Microstructure and corrosion resistance of dissimilar welded joints 02 Sep 2022	Not addressed in the paper.
Open access•Journal Article•DOI Controlled atmosphere GMAW welding of transportation vehicles and production machines parts made from 30MnB5 steel Evgeny Ivanayskiy, Aleksei Ishkov, Aleksandr Ivanayskiy, Iakov Ochakovskii - Show less +3 more 01 Jan 2018 3 Citations	Different gases like argon, carbon dioxide, and carbon monoxide influence welding of 30MnB5 steel. Carbon monoxide shielding gas prevents alloying element oxidation, ensuring a full-strength weld with desired properties.
Open access•Journal Article•DOI Effect of heat treatment atmospheres on microstructure evolution and corrosion resistance of 2205 duplex stainless steel weldments A. Y. Mohamed, Ahmed Hussein Abdelraheem Mohamed, Z. Abdel Hamid, Ahmed I. Z. Farahat, Ahmed El-Nikhaily - Show less +4 more 21 Mar 2023-Dental science reports	Protective atmospheres like nitrogen and argon during post weld heat treatment influence microstructure in duplex stainless steel weldments. Nitrogen can lead to nitride precipitates affecting corrosion resistance.

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