Kingsley, Achike Maduabuchi and Chukwukelue, Onyechi Pius and Chukwutoo, Ihueze Christopher (2023) Evaluation of Microstructure and Martensite Formation in AISI 1018 Mild Steel Plate Weldments Obtained by Arc Welding Processes. In: Research Highlights in Science and Technology Vol. 5. B P International, pp. 148-163. ISBN 978-81-19315-56-7
Full text not available from this repository.Abstract
This chapter analyzed the microstructure, martensite formation and heat treatment of AISI 1018 mild steel plate weldments obtained using arc welding processes. Four arc welding processes were employed which are: Submerged Arc Welding (SAW), Shielded Metal Arc Welding (SMAW), Gas Metal Arc Welding (GMAW) and Gas Tungsten Arc Welding (GTAW). The welding design was done in accordance with American Welding Society (AWS) Code D1.1 using symmetric welding sequence. It was observed that the welding process applied determines the heat input which governs the cooling rate and consequently the mechanical properties of the weldments. From the results obtained, submerged arc welding generated the highest heat input compared to the other welding processes while gas tungsten arc welding generated the least heat input. This could be attributed to high arc efficiency of SAW and low arc efficiency of GTAW. High rate of martensite formation which is as a result of high heat input was also observed in submerged arc welding. It is the presence of this martensite that is responsible for brittle nature of welds. Differential scanning calorimetry (DSC) was employed for detection of this martensite in welds while differential thermal analysis (DTA) was employed as a heat treatment method to relieve the martensite formed in welds.
| Item Type: | Book Section |
|---|---|
| Subjects: | STM Repository > Multidisciplinary |
| Depositing User: | Managing Editor |
| Date Deposited: | 04 Oct 2023 05:09 |
| Last Modified: | 04 Oct 2023 05:09 |
| URI: | http://classical.goforpromo.com/id/eprint/3888 |
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