Effect of molybdenum addition on microstructure and mechanical properties of plain carbon steel weld

  • Jyoti Menghani Department of Mechanical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, India 395007
  • Kunal Dwivedi Department of Mechanical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, India 395007
Keywords: Taguchi method, submerged arc welding (SAW), grain boundary ferrite (GBF), secondary phase {FS (A)}, acicular ferrite (AF), granular bainite (GB)


The present investigation has two main objectives; first is optimization of welding process parameters of submerged arc welding (SAW) using Taguchi philosophy and second is to improve the mechanical properties such as strength and microhardness of weld joint by alloying with varying amounts of molybdenum. For optimization of welding process, parameters Taguchi philosophy have been applied on a mild steel plate (AISI C- 1020) of 10 mm thickness with 60o groove angle with arc voltage and welding speed as variables and bead width as output variables. A mathematical relationship between bead width, arc voltage and welding speed has also been found using multiple regression analysis for the present base metal plate geometry. After optimizing welding parameters, molybdenum has been added individually to the welding area in varying percentages. The properties of alloyed and unalloyed weld metal bead are compared. The mechanical characterization of weld has been done in terms of microhardness, tensile strength, whereas microstructural characterization has been performed using optical microscopy, XRD and EDS. The presence of molybdenum resulted in bainite structure in weld bead having a refined grain structure, enhancement in tensile strength and microhardness. The XRD results showed the formation of molybdenum carbides justifying the increase in microhardness value.


L.M Singh, A Saha, Int. Eng. Res. Techn. (IJERT) 1 (2012)1-4.

S. Kumanan, J.E.R. Dhas, K Gowthaman, Indian J. Eng. Mat. Sci. l14 (2007) 177-183.

Y. S. Tarng , W. H. Yang, Mat. Man. Processes 13 (1998) 55-467.

S. Datta, A. Bandyopadhyay, P. K. Pal, Int. J. Adv. Manuf. Technol. 36 (2008) 1080-1090. [5] G.K Purohit, Digamber, Int. J. Eng. Res. Development 1 (2012) 9-15.

S. Datta, S.S. Mahapatra, J. Eng. Res. 7 (2010) 42-52.

Y. S. Tarng,W. H. Yang ,S. C. Juang, Int. J. Adv. Man. Techn. 16 (2000) 688-694.

S.D. Bhole, J.B. Nemade, L. Collins, Cheng Liu, J. Mat. Proc. Techn. 173 (2006) 92-100.

N.D. Pandey, A. Bharti, S.R. Gupta, ibid., 40 (1994) 195-211.

A.Ma. Paniagua-Mercado, V.M. Lopez-Hirata, H.J. Dorantes-Rosalesa, P.E. Diaz, E.D. Valdez, Mat. Charact. 60 (2009) 36-39.

J.Tušeka, M. Subanb, Faculty of Mechanical Engineering,University of Ljubljana, Aškerčeva 6, 1000 Ljubljana, Slovenia institute za varilstvo, Ptujska 19, 1000 Ljubljana, Slovenia.

N. Bailey, Welding Research Supplement to The Welding Journal, August 1991.

M. Thuvander, L. Karisson, B. Munir, Stainless Steel World 16 (2004) 52-57.


B. Lindsle, H. Rutz Hoeganaes Corporation Cinnaminson, NJ 08077, USA

C.K Gupta, Extractive Metallurgy of Molybdenum page 26 CTC press ISBN No. 08493-4758.

B.P. Bamankar, S.M. Sawant, Int. J. Adv. Eng. Res. and Studies 3 (2013) 8-10.




A. Fadel, D.Glišić, N. Radović, Dj. Drobnjak, J. Mater. Sci. Technol. 28 (2012) 1053-1058.

R.W.K. Honeycombe, H.K.D.H. Bhadeshia, 1996, Steels; Microstructure and Properties, Second Edition, Metallurgy and Materials Science Series, Edward Arnold, London, Great Britain

Y.Yoshino, R.D. Stout, Welding Research, Supplement to The Welding Journal, March,1979, Sponsored By The American Welding Society And The Welding Research Council.

Asi Suikkanen Development and Processing of Low Carbon Bainaitic Steels, Academic dissertation, Faculty of Technology of the University of Oulu, Raahensali, p. 52]

J. Chen, S. Tang, Z. Liu, G.Wang, Mat. Design 49 (2013) 465-470.

S. Kou, Welding Metallurgy,Second Edition,John Wiley & Sons, Inc., Hoboken, 2003, New Jersey.

The effect of alloying elements on HAZ, Microstructure and Toughness British Steel ECSC Agreement Number 7210.KA/816, FINAL TECHNICAL REPORT


L.M Singh, A Saha, Int. Eng. Res. Techn. (IJERT) 1 (2012)1-4.

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