Effect of Preheating on Microstructure and Mechanical Properties in Mild Steel Arc Weld Joints

Md Seam  Shaikh; Md Shahriar Shajib; Md Abdul Kader; Dipayan Mondal; Md. Ashraful Islam

doi:10.15282/ijame.22.1.2025.14.0931

Authors

Md Seam Shaikh Department of Mechanical Engineering, Khulna University of Engineering & Technology, 9203 Khulna, Bangladesh
Md Shahriar Shajib Department of Mechanical Engineering, Khulna University of Engineering & Technology, 9203 Khulna, Bangladesh
Md Abdul Kader Department of Mechanical Engineering, Rajshahi University of Engineering & Technology, 6204 Rajshahi, Bangladesh
Dipayan Mondal Department of Mechanical Engineering, Khulna University of Engineering & Technology, 9203 Khulna, Bangladesh
Md. Ashraful Islam Department of Mechanical Engineering, Khulna University of Engineering & Technology, 9203 Khulna, Bangladesh

DOI:

https://doi.org/10.15282/ijame.22.1.2025.14.0931

Keywords:

Arc Welding, Preheating of mild steel, SEM, Microstructure, Fusion defects

Abstract

Mild steel welding can result in fusion defects that affect the integrity and mechanical characteristics of welded joints. Although several techniques have been investigated to enhance the quality of the weld, it is not fully understood how preheating affects the mechanical-microstructure properties of arc-welded joints of mild steel. This study examines the effect of preheating on the mechanical characteristics and microstructure of arc-welded mild steel joints. Before welding, mild steel samples were preheated to 250°C, 450°C, and 650°C, and the welded specimens' tensile, bending, hardness, and fracture morphologies were evaluated. The results indicate that preheating significantly enhances mechanical properties, with tensile strength, ductility, and toughness increasing with temperature, particularly tensile strength, which improved by up to 35.46%. Therefore, at reduced cooling rates at 650°C, the fusion defects were improved; hence, there was better joint integrity. From the SEM analyses, a finer and homogeneous microstructure with increasing temperature also showed that the observed decrease in porosity and fusion defects corroborate the results underlining the contribution of preheating to ensure reliability and enhanced quality of the welded mild steel joints, thereby providing useful indications on the applications of welding to industries such as automotive, aerospace, pipeline, and manufacturing machinery.

References

[1] E. Osarolube, I. Owate, and N. Oforka, “Corrosion behaviour of mild and high carbon steels in various acidic media,” Scientific Research and Essay, vol. 3, no. 6, pp. 224-228, 2008.

[2] A. B. Murphy, “A perspective on arc welding research: the importance of the arc, unresolved questions and future directions,” Plasma Chemistry and Plasma Processing, vol. 35, no. 3, pp. 471-489, 2015.

[3] H. Conrad, “Effects of electric current on solid state phase transformations in metals,” Materials Science and Engineering: A, vol. 287, no. 2, pp. 227-237, 2000/08/15/ 2000.

[4] E. Zavvar, P. Rosa-Santos, E. Ghafoori, and F. Taveira-Pinto, “Analysis of tubular joints in marine structures: A comprehensive review,” Marine Structures, vol. 99, p. 103702, 2025.

[5] H. Z. Rajani, H. Torkamani, M. Sharbati, and S. Raygan, “Corrosion resistance improvement in gas tungsten arc welded 316L stainless steel joints through controlled preheat treatment,” Materials & Design, vol. 34, pp. 51-57, 2012.

[6] U. Soy, O. Iyibilgin, F. Findik, C. Oz, and Y. Kiyan, “Determination of welding parameters for shielded metal arc welding,” Scientific Research and Essays, vol. 6, no. 15, pp. 3153-3160, 2011.

[7] F. Uzun and A. N. Bilge, “Application of ultrasonic waves in measurement of hardness of welded carbon steels,” Defence Technology, vol. 11, no. 3, pp. 255-261, 2015.

[8] M. Hamada, Y. Fukada, and Y.-i. Komizo, “Microstructure and precipitation behavior in heat affected zone of C-Mn microalloyed steel containing Nb, V and Ti,” Iron and Steel Institute of Japan International, vol. 35, no. 10, pp. 1196-1202, 1995.

[9] C. Davis and J. King, “Cleavage initiation in the intercritically reheated coarse-grained heat-affected zone: Part I. Fractographic evidence,” Metallurgical and Materials Transactions A, vol. 25, pp. 563-573, 1994.

[10] A. Lambert-Perlade, A.-F. Gourgues, and A. Pineau, “Austenite to bainite phase transformation in the heat-affected zone of a high strength low alloy steel,” Acta Materialia, vol. 52, no. 8, pp. 2337-2348, 2004.

[11] M. Jawad, M. Jahanzaib, M. A. Ali, M. U. Farooq, N. A. Mufti, C. I. Pruncu et al., “Revealing the microstructure and mechanical attributes of pre-heated conditions for gas tungsten arc welded AISI 1045 steel joints,” International Journal of Pressure Vessels and Piping, vol. 192, p. 104440, 2021.

[12] P. Das, A. Benslimane, M. Islam, D. Mondal, and M. J. H. Nazim, “A thermo-mechanically loaded rotating FGM cylindrical pressure vessels under parabolic changing properties: An analytical and numerical analysis,” Heliyon, vol. 10, no. 4, e25969, 2024.

[13] P. Das, M. Islam, S. Somadder, and M. J. A. O. A. M. Hasib, “Analytical and numerical solutions of pressurized thick-walled FGM spheres,” Archive of Applied Mechanics, vol. 93, no. 7, pp. 2781-2792, 2023.

[14] M. Hasan, M. A. Islam, Z. Huang, J. Zhao, and Z. J. M. S. Jiang, “Influence of sintering time on diffusion bonding of WC-10Co and AISI4340 by spark plasma sintering,” Materials Science and Technology, vol. 39, no. 6, pp. 683-693, 2023.

[15] E. Zavvar, F. Taveira-Pinto, and P. Rosa-Santos, “Identification of probability distributions of SCFs in three-planar KT-joints,” Ocean Engineering, vol. 312, p. 119222, 2024.

[16] E. Zavvar, A. G. Majidi, P. R. Santos, and F. Taveira-Pinto, “Optimal probability distribution for SCFmax in KT-joints strengthened with concrete in wind turbine support structures,” Journal of Constructional Steel Research, vol. 222, p. 108994, 2024.

[17] E. Zavvar, F. Sousa, G. Giannini, F. Taveira-Pinto, and P. R. Santos, “Probability of maximum values of stress concentration factors in tubular DKT-joints reinforced with FRP under axial loads,” in Structures: Elsevier, vol. 66 p. 106809, 2024.

[18] E. Zavvar, G. Giannini, F. Taveira-Pinto, and P. R. Santos, “Parametric study of stress concentration factors in KT connections reinforced with concrete subjected to axial loads,” Ocean Engineering, vol. 298, p. 117209, 2024.

[19] E. Zavvar, J. Henneberg, and C. G. Soares, “Stress concentration factors in FRP-reinforced tubular DKT joints under axial loads,” Marine Structures, vol. 90, p. 103429, 2023.

[20] E. Zavvar and C. G. Soares, “Stress distribution in uniplanar KT joints reinforced with fibre reinforced polymer subjected to the axial loadings,” in Advances in the Analysis and Design of Marine Structures: CRC Press, pp. 565-575, 2023.

[21] E. Zavvar, H. S. Abdelwahab, E. Uzunoglu, B.-Q. Chen, and C. Guedes Soares, “Stress distribution on the preliminary structural design of the CENTEC-TLP under still water and wave-induced loads,” Journal of Marine Science and Engineering, vol. 11, no. 5, p. 951, 2023.

[22] S. Kumar and A. Shahi, “Effect of heat input on the microstructure and mechanical properties of gas tungsten arc welded AISI 304 stainless steel joints,” Materials & Design, vol. 32, no. 6, pp. 3617-3623, 2011.

[23] E. Gharibshahiyan, A. H. Raouf, N. Parvin, and M. Rahimian, “The effect of microstructure on hardness and toughness of low carbon welded steel using inert gas welding,” Materials & Design, vol. 32, no. 4, pp. 2042-2048, 2011.

[24] M. Pirinen, Y. Martikainen, P. Layus, V. Karkhin, and S. Y. Ivanov, “Effect of heat input on the mechanical properties of welded joints in high-strength steels,” Welding International, vol. 30, no. 2, pp. 129-132, 2016.

[25] B. Karthick, L. Shrihari, M. Sakthivel, S. Shriram, and V. Silambarasan, “Effect of heat input on the microstructure and mechanical properties of gas tungsten arc welded AISI 316 stainless steel joints,” International Research Journal on Advanced Science Hub, vol. 2, no. 08, pp. 23-27, 2020.

[26] K. Kornokar, F. Nematzadeh, H. Mostaan, A. Sadeghian, M. Moradi, D. G. Waugh et al., “Influence of heat input on microstructure and mechanical properties of gas tungsten arc welded HSLA S500MC steel joints,” vol. 12, no. 4, p. 565, 2022.

[27] S. R. Nathan, V. Balasubramanian, S. Malarvizhi, and A. Rao, “Effect of welding processes on mechanical and microstructural characteristics of high strength low alloy naval grade steel joints,” Defence Technology, vol. 11, no. 3, pp. 308-317, 2015.

[28] R. Ahmad and M. Bakar, “Effect of a post-weld heat treatment on the mechanical and microstructure properties of AA6061 joints welded by the gas metal arc welding cold metal transfer method,” Materials & Design, vol. 32, no. 10, pp. 5120-5126, 2011.

[29] J. Yi, G. Wang, S. Li, Z. Liu, and Y. Gong, “Effect of post-weld heat treatment on microstructure and mechanical properties of welded joints of 6061-T6 aluminum alloy,” Transactions of Nonferrous Metals Society of China, vol. 29, no. 10, pp. 2035-2046, 2019.

[30] C. Zhu, X. Tang, Y. He, F. Lu, and H. Cui, “Effect of preheating on the defects and microstructure in NG-GMA welding of 5083 Al-alloy,” Journal of Materials Processing Technology, vol. 251, pp. 214-224, 2018/01/01/ 2018.

[31] Z. Luo, S. Ao, Y. J. Chao, X. Cui, Y. Li, and Y. Lin, “Application of pre-heating to improve the consistency and quality in AA5052 resistance spot welding,” Journal of Materials Engineering and Performance, vol. 24, pp. 3881-3891, 2015.

[32] Y. He, X. Tang, C. Zhu, F. Lu, and H. Cui, “Study on insufficient fusion of NG-GMAW for 5083 Al alloy,” The International Journal of Advanced Manufacturing Technology, vol. 92, pp. 4303-4313, 2017.

[33] H. Ma, G. Qin, L. Wang, X. Meng, and L. Chen, “Effects of preheat treatment on microstructure evolution and properties of brazed-fusion welded joint of aluminum alloy to steel,” Materials & Design, vol. 90, pp. 330-339, 2016.

[34] M. Charkhi and D. Akbari, “Experimental and numerical investigation of the effects of the pre-heating in the modification of residual stresses in the repair welding process,” International Journal of Pressure Vessels and Piping, vol. 171, pp. 79-91, 2019.

[35] P. Čičo, D. Kalincová, and M. Kotus, “Influence of welding method on microstructural creation of welded joints,” Research in Agricultural Engineering, vol. 57, no. Special Issue, pp. S50-S56, 2011.

[36] P. Zhao, X. Zhang, S. Bian, W. Zhang, and Z. Cao, “ Effect of preheating temperature on the defects in pulsed laser welding of sheet AZ31 magnesium alloy,” Materials Letters, vol. 355, 2024.

[37] M. Landowski, S. C. Simon, C. Breznay, D. Fydrych, and B. Varbai, “Effects of preheating on laser beam–welded NSSC 2120 lean duplex steel,” The International Journal of Advanced Manufacturing Technology, vol. 130, no. 3, pp. 2009-2021, 2024.

[38] P. Muangjunburee, H. Z. Oo, S. Z. Abd Rahim, and B. Srikarun, “Effects of heat input and preheating temperature on the microstructure and hardness of repairing the heat-affected zone of thermite welded rail head surface,” Indonesian Journal of Science and Technology, vol. 9, no. 2, pp. 421-440, 2024.

[39] J. Sun and K. Dilger, “Influence of preheating on residual stresses in ultra-high strength steel welded components,” Journal of Materials Research and Technology, vol. 25, pp. 3120-3136, 2023.

[40] S. Rajkumar, M. Lijalem, T. Aklilu, and V. Mohanavel, “Prediction and estimation of electroplating characteristics, corrosion rate of zinc coated mild steel coupling,” Carbon, vol. 100, pp. 0.25-0.290.

[41] M. Cayard and W. Bradley, “A comparison of several analytical techniques for calculating JR curves from load-displacement data and their relation to specimen geometry,” Engineering Fracture Mechanics, vol. 33, no. 1, pp. 121-132, 1989.

[42] S. Vaynman, M. E. Fine, and C. Hahin, Formability of New High Performance A710 Grade 50 Structural Steel, Illinois Center for Transportation Series No. 14-002, 2014.

[43] J.-M. Schneider, M. Bigerelle, and A. Iost, “Statistical analysis of the Vickers hardness,” Materials Science and Engineering: A, vol. 262, no. 1-2, pp. 256-263, 1999.

[44] J. Yuan, H. Ji, Y. Zhong, G. Cui, L. Xu, and X. Wang, “Effects of different pre-heating welding methods on the temperature field, residual stress and deformation of a Q345C steel butt-welded joint,” Materials, vol. 16, no. 13, p. 4782, 2023.