IJE TRANSACTIONS A: Basics Vol. 32, No. 1 (January 2019) 99-105    Article in Press

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G. Singh and D. Kumar Shukla
( Received: May 11, 2018 – Accepted in Revised Form: January 03, 2019 )

Abstract    Austenitic stainless steel SS304 grade was welded with active Tungsten Inert Gas (TIG) welding process by applying a flux paste made of SiO2 powder and acetone. SiO2 flux application improves the weld bead depth with a simultaneous reduction in weld bead width. The improvement in penetration results from arc constriction and reversal of Marangoni convection. Experimental studies revealed that the SiO2 flux assisted TIG welding can enhance the weld bead penetration by more than 100%. Full depth welds up to 6mm were obtained by applying SiO2 flux. Microstructure reveals a reduction in ferrite formation in fusion zone by applying SiO2 flux. Samples welded with flux exhibits reduction in tensile strength and improvement in impact strength. Fractography of the tensile test specimens reveals the presence of oxide inclusions in the samples welded with flux. The relation of ferrite content and mechanical properties are presented in this paper.


Keywords    Active Tungsten Inert Gas, Marangoni Convection, Mechanical Properties, Austenitic Stainless Steel



فولاد ضد زنگ فولاد Austenitic فولاد SS304 با استفاده از ریز شویی ساخته شده از پودر SiO2 و استون، با روش جوش TIG فعال جوش داده شده است. کاربرد Flux SiO2 باعث افزایش عمق دانه جوشکاری با کاهش همزمان در عرض ورق جوش می شود. بهبود نفوذ در اثر انقباض قوس و انحراف کانال مارنگونی است. مطالعات تجربی نشان داد که جوش SiO2 به جوشکاری TIG کمک می کند تا نفوذ باند جوشکاری بیش از 100٪ افزایش یابد. جوش های عمیق عمیق تا 6 میلی متر با استفاده از شار SiO2 به دست آمد. ریزساختار با کاهش شار SiO2 کاهش فریت در منطقه همجوشی را نشان می دهد. نمونه هایی که با شار جوش داده می شوند باعث کاهش مقاومت کششی و بهبود مقاومت ضربه می شوند. فراکتوگرافی نمونه های آزمون کششی نشان دهنده حضور اتم های اکسید در نمونه های جوش داده شده با شار است. نسبت فریت و خواص مکانیکی در مقاله ارائه شده است.


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