期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2016
期号：NCIIME
页码：137
出版社：S&S Publications
摘要：In Gas Metal Arc welding (GMAW) process for protecting the arc and molten weld-pool fromatmospheric contamination a shielding gas of argon or CO2 is supplied continuously during welding. Argon is generallyused for welding of non-ferrous metals. CO2 gas is used for welding of mild steel. For alloy steels and even for mildsteel applications requiring higher quality, a blend of argon/CO2 gas mixture is normally used. The arc characteristics,metal transfer and weld pool behavior are greatly influenced by the type of shielding gas. The improved arcingcharacteristics and metal transfer in GMA welding with argon/CO2 mixed gas is due this influence. In this experimentalwork, martensitic stainless steel (SS 410) is bonded by GMAW (MIG welding) process under different gas mixturessuch as 100%Ar, 98.5%Ar + 1.5%CO2, 95%Ar+5%CO2. The improved weld quality is attributed to the varying arc andweld-pool dynamics caused by the differing thermo-physical properties of the shielding gases that are supplied varyingthe mixture proportion. The macro, microstructure of the welded samples has been investigated. Welding have beencarried out under different shielding gas mixture. The suitable shielding gas mixture of 95%Ar+5%CO2 achieved betterresults. the tensile and impact test have been carried out the above welded plates. The samples that was welded under95%Ar+5%CO2 shielding media was found to be the best in terms of tensile strength and impact strength. TheMartensitic Stainless steel (SS 410) are having good corrosive resistance at low cost. Typical applications includehighly stressed parts needing the combination of strength and corrosion resistance like plates and heavy structures.
