ABSTRACT When joining ductile iron by submerged arc welding technique, a suitable welding speed and current, among other fac- tors, need to be skillfully put in place so as to enhance good welding. This work is based on microstructural examina- tion of preheated ductile iron at various temperatures ranging between 100°C - 400°C. Optical microscope was used for the microstructure analysis. The result shows varied complex microstructures at the fusion zone, un-mixed zone, par- tially melted zone and at the heat affected zone.
Cite this paper
D. Kwa, J. Borode and I. Momoh, "Weldability Assessment of Preheated Ductile Iron Microstructures," Journal of Minerals and Materials Characterization and Engineering, Vol. 11 No. 10, 2012, pp. 1000-1004. doi: 10.4236/jmmce.2012.1110102.
 R. W. Messler, “Joining of Materials and Structures from Pragmatic process to Enabling Technology,” Butter Worth Heinemann, Burlington, 2004.
 R. Blondeau, “Metallurgy and Mechanics of Welding: Processes and Industrial Applications,” Wiley, Hoboken, 2008.
 A. V. Adedayo and B. Aremo, “Influence of Mould Heat Storage Capacity on Properties of Grey Iron,” Journal of Minerals & Materials Characterization & Engineering, Vol. 10, No. 4, 2011, pp. 387-396.
 C. Barbosa, J. L. Nascimento, I. M. V. Caminha and I. C. Abud, “Microstructural Aspects of the Failure Analysis of Nickel Base Superalloys Components,” Engineering Failure Analysis, Vol. 12, No. 3, 2005, pp. 348-361.
 A. M. Babakr, A. Al-Ahmari, K. Al-Jumayiah and F. Habiby, “Sigma Phase Formation and Embrittlement of Cast Iron-Chromium-Nickel (Fe-Cr-Ni) Alloys,” Journal of Minerals & Materials Characterization & Engineering, Vol. 7, No. 2, 2008, pp. 127-145.
 E. M. El-Banna, “Effect of Preheat on Welding of Ductile Cast Iron,” Materials Letters, Vol. 4, No. 1, 1999, pp. 20-26.
 W. L. Galvery and F. B. Marlow, “Welding Essentials,” Galvery and Marlow Industrial Press, New York, 2007,
 H. B. Cary and S. Hetzer, “Modern Welding Technol- ogy,” Cary and Hetzer Prentice Hall, Upper Saddle River, New Jersey, 2004,
 D. M. Viano, N. U. Ahmed and G. O. Schumann, “Influ- ence of Heat Input and Travel Speed on Microstructure and Mechanical Properties of Double Tandem Submerged Arc High Strength Low Alloy Steel Weldments,” Journal of Science and Technology of Welding and Joining, Vol. 5, No. 1, 2000, pp. 26-34.
 P. Keshav and D. K. Dwivedi, “Microstructure and Ten- sile Properties of Submerged Arc Welded 1.25Cr-0.5Mo Steel Joints,” Journal of Materials and Manufacturing Processes, Vol. 23, No. 5, 2008, pp. 463-468.