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Published:
Jul 9, 2012Keywords:
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Main Article Content
Effects of Heat Input on the Chemical Composition and Hardness of Mild Steel Weld
Abstract
This study examines the thermochemical reactions which alter weld metal chemistry by applying the arc heat considering the convective, radiation and arc heat losses. From numerical analysis, it was found that the radiation heat loss was dominant in the welding process which confirms the claims made by other investigators. From a Spectrometric analysis carried out on all the welded metal specimens after the welding process, it was found that certain alloying elements were lost and others gained. However, multivariate regression analysis revealed that the quantity of Ni present in the base metal, wire, and weldment are higher than the optimum quantity of 1.68 percent by weight. The values for Mn available in the base metal, wire, and weldment are less than the optimum quantity of 1.21 percent by weight. However, the other alloying elements present in weldment fall within the expected optimum values. Most of the significant elements responsible for weldment hardenability such as C, Mo, and Cr were drastically reduced in quantity during the prolonged welding process. In this study the relationship between thermal effect and weld metal chemistry has been adequately treated.
