Indian Journal of Applied Engineering Research

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Model for Assessment and Prediction of the Hardness of the Heat Affected Zone in Aluminum Weldment Cooled in Groundnut Oil


Affiliations
1 Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria
2 Department of Materials and Metallurgical Engineering, Enugu State University of Science & Tech., Enugu, Nigeria
     

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αModels have been derived for assessing and predicting the heat affected zone hardness of aluminum weldment cooled in groundnut oil in relation to the respective and combined values of HAZ hardness of mild steel and cast iron welded and cooled under the same conditions have been derived. The derived single models; β = 0.4478ϒ, β = 0.8031α, and ϒ = 1.7934α as well as general model; β = 1.2509[(ϒα/ϒ + α)] were found to predict the HAZ hardness of aluminum weldment cooled in groundnut oil as a function of the HAZ hardness of mild steel or cast iron welded and cooled under the same conditions. The maximum deviation of the model-predicted HAZ hardness values β, ϒ and α from the corresponding experimental values βexp, γexp and αexp was less 0.02% indicating the reliability and validity of the model.

Keywords

Model, Hardness, Heat Affected Zone, Aluminum Weldments, Mild Steel, Cast Iron
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  • E. E. Nnuka, F. A. Ovat and M. I. Oseni. Effect of Electrode Types on the Mechanical Properties and Structure of Welded Steel Joints. JMME, 3(1) (2008)7-13.

  • J. F. Lancaster. Metallurgy of Welding: The Mechanical Properties of the Heat Affected Zone, 4th Edition, Allen and University, London. (1987)

  • C. I. Nwoye. Comparative Studies of the Cooling Ability of Hydrocarbon Based Media and their Effects on the Hardness of the Heat Affected Zone (HAZ) in Weldments, JMME, 3 (1) (2008) 35-37.

  • C. I. Nwoye, U. Odumodu, C. C. Nwoye, G. C. Obasi and O. O. Onyemaobi. Model for Predictive Analysis of Hardness of the Heat Affected Zone in Aluminum Weldment Cooled in Groundnut Oil Relative to HAZ Hardness of Mild Steel and Cast Iron Weldments Cooled in Same Media, New York Sc. Journal, 2(6) (2009) 93-98.

  • C. I. Nwoye. Quadratic Model for Predicting the Hardness of Heat Affected Zone in Water Cooled Cast Iron Weldment In Relation to Similarly Cooled Aluminum and Mild Steel Weldments, JMMCE, 8 (10) (2009a) 765-773.

  • C.I. Nwoye. Quadratic and Linear Models for Predicting the Hardness of Heat Affected Zone in Air Cooled Cast Iron Weldment in Relation to the HAZ Hardness of Aluminum and Mild Steel Weldments Cooled in Same Media, Res. 1 (4) (2009b)1-6.


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  • Model for Assessment and Prediction of the Hardness of the Heat Affected Zone in Aluminum Weldment Cooled in Groundnut Oil

Abstract Views: 502  |  PDF Views: 0

Authors

C. I Nwoye
Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria
S Nwakpa
Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria
E.M Ameh
Department of Materials and Metallurgical Engineering, Enugu State University of Science & Tech., Enugu, Nigeria
C. N Nwambu
Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria
A.O Agbo
Department of Materials and Metallurgical Engineering, Enugu State University of Science & Tech., Enugu, Nigeria

Abstract


αModels have been derived for assessing and predicting the heat affected zone hardness of aluminum weldment cooled in groundnut oil in relation to the respective and combined values of HAZ hardness of mild steel and cast iron welded and cooled under the same conditions have been derived. The derived single models; β = 0.4478ϒ, β = 0.8031α, and ϒ = 1.7934α as well as general model; β = 1.2509[(ϒα/ϒ + α)] were found to predict the HAZ hardness of aluminum weldment cooled in groundnut oil as a function of the HAZ hardness of mild steel or cast iron welded and cooled under the same conditions. The maximum deviation of the model-predicted HAZ hardness values β, ϒ and α from the corresponding experimental values βexp, γexp and αexp was less 0.02% indicating the reliability and validity of the model.

Keywords


Model, Hardness, Heat Affected Zone, Aluminum Weldments, Mild Steel, Cast Iron

References