Abstract




 
   

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

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  STRUCTURE-PROPERTY INTERACTION IN FLUX ASSISTED TUNGSTEN INERT GAS WELDING OF AUSTENITIC STAINLESS STEEL
 
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

 

چکیده   

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.

References   

1. Cary, H.B. and Helzer, S.C., "Modern welding technology",  Mc Graw Hill Education, (1979).
2. Lu, S., Fujii, H. and Nogi, K., "Marangoni convection and weld shape variations in he–co2 shielded gas tungsten arc welding on sus304 stainless steel", Journal of Materials Science,  Vol. 43, No. 13, (2008), 4583-4591.
3. Heiple, C., "Mechanism for minor element effect on gta fusion zone geometry", Welding Journal,  Vol. 61, No. 4, (1982), 97s-102s.
4. Pollard, B., "The effects of minor elements on the welding characteristics of stainless steel", Welding Journal,  Vol. 67, No. 9, (1988), 202s-213s.
5. Huang, H., Shyu, S., Tseng, K. and Chou, C., "Evaluation of tig flux welding on the characteristics of stainless steel", Science and Technology of Welding and Joining,  Vol. 10, No. 5, (2005), 566-573.
6. Modenesi, P.J., Apolinario, E.R. and Pereira, I.M., "Tig welding with single-component fluxes", Journal of Materials Processing Technology,  Vol. 99, No. 1-3, (2000), 260-265.
7. Tseng, K.-H., "Development and application of oxide-based flux powder for tungsten inert gas welding of austenitic stainless steels", Powder Technology,  Vol. 233, (2013), 72-79.
8. Chern, T.-S., Tseng, K.-H. and Tsai, H.-L., "Study of the characteristics of duplex stainless steel activated tungsten inert gas welds", Materials & Design,  Vol. 32, No. 1, (2011), 255-263.
9. Howse, D. and Lucas, W., "Investigation into arc constriction by active fluxes for tungsten inert gas welding", Science and Technology of Welding and Joining,  Vol. 5, No. 3, (2000), 189-193.
10. SINGH, G., "Selection and mechanism of using active gas in gtaw process–a review", Journal of Material & Metallurgical Engineering,  Vol. 8, No. 1, (2018), 49-61.
11. Thomson, J., "Xlii. On certain curious motions observable at the surfaces of wine and other alcoholic liquors", The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science,  Vol. 10, No. 67, (1855), 330-333.
12. Limmaneevichitr, C. and Kou, S., "Visualization of marangoni convection in simulated weld pools containing a surface-active agent", Welding Journal,  Vol. 79, No. 11, (2000), 324s-330s.
13. Shanping, L., Hidetoshi, F. and Kiyoshi, N., "Effects of co2 shielding gas additions and welding speed on gta weld shape", Journal of Materials Science,  Vol. 40, No. 9-10, (2005), 2481-2485.
14. Choudhary, S. and Duhan, R., "Effect of activated flux on properties of ss 304 using tig welding", IJE Transactions B: Applications,  Vol. 28, No. 2, (2015), 290-295.
15. Modenesi, P.J., Colen Neto, P., Roberto Apolinário, E. and Batista Dias, K., "Effect of flux density and the presence of additives in atig welding of austenitic stainless steel", Welding International,  Vol. 29, No. 6, (2015), 425-432.
16. Cai, Y., Luo, Z., Huang, Z. and Zeng, Y., "Effect of cerium oxide flux on active flux tig welding of 800 mpa super steel", Journal of Materials Processing Technology,  Vol. 230, (2016), 80-87.
17. Tathgir, S., Bhattacharya, A. and Bera, T.K., "Influence of current and shielding gas in tio2 flux activated tig welding on different graded steels", Materials and Manufacturing Processes,  Vol. 30, No. 9, (2015), 1115-1123.
18. Tseng, K.-H. and Chen, K.-L., "Comparisons between TiO2-and SiO2-flux assisted tig welding processes", Journal of Nanoscience and Nanotechnology,  Vol. 12, No. 8, (2012), 6359-6367.
19. Kotecki, D. and Lippold, J., "Welding metallurgy and weldability of stainless steels", Wiley, Hoboken, NJ Barbero B, Ureta E (2011) Comparative study of different digitization techniques and their accuracy. Comput Aided Des,  Vol. 43, (2005), 188-206.
20. Rizvi, S.A. and Tewari, S., "Effect of different welding parameters on the mechanical and microstructural properties of stainless steel 304h welded joints", International Journal of Engineering, Transactions A: Basics,  Vol. 31, No. 8, (2017).
21. Hauser, D. and Vanecho, J., "Effects of ferrite content in austenitic stainless steel welds", Weld. J.(Miami);(United States),  Vol. 61, No. 2, (1982).
22. Doniavi, A., Hosseini, A. and Ranjbary, G., "Prediction and optimization of mechanical properties of st52 in gas metal arc weld using response surface methodology and anova", International Journal of Engineering Transactions C: Aspects,  Vol. 29, No. 9, (2016), 1307-1313.


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