Simulation of Residual Stress Mitigation in Dissimilar T-Joint by Optimized Welding Parameters and Rapid Cooling

Aji, Bayu (2024) Simulation of Residual Stress Mitigation in Dissimilar T-Joint by Optimized Welding Parameters and Rapid Cooling. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pengelasan adalah metode pembuatan sambungan logam paling matang yang digunakan secara luas dalam berbagai aplikasi industri. Tegangan sisa dan distorsi yang disebabkan oleh pengelasan merupakan salah satu subjek yang paling banyak dipelajari untuk struktur las karena keduanya dapat secara signifikan mengganggu kinerja dan keandalan sambungan las. Simulasi komputer telah banyak digunakan untuk memodelkan sambungan las dan melakukan solusi analitis untuk memprediksi besarnya tegangan sisa las dan distorsi. Meskipun beberapa penelitian dan penelitian telah dilakukan mengenai hal ini, hal ini masih menimbulkan tantangan yang signifikan dan area penting untuk penyelidikan lebih lanjut, khususnya pada sambungan las T yang berbeda. Pengelasan T-joint adalah salah satu struktur dan peralatan paling umum untuk aplikasi industri, termasuk kapal, kapal, dan platform. Selain itu, las logam yang berbeda banyak digunakan di industri karena persyaratan layanan pengoperasian yang spesifik. Kedua aspek tersebut sangat mempengaruhi derajat tegangan sisa dan potensi distorsi pada sambungan las. Studi ini menyelidiki pengaruh perubahan masukan panas, pendinginan cepat CO2, dan urutan pengelasan terhadap tegangan sisa dan perpindahan pada sambungan T pengelasan yang berbeda, yang mendasari faktor-faktor signifikan yang dapat dioptimalkan lebih lanjut untuk kemungkinan mitigasi distorsi. Penelitian ini menggunakan software analisis hingga ANSYS Workbench dan stem untuk analisis termal. Delapan belas kasus disimulasikan setelah model divalidasi berdasarkan referensi, yang melibatkan metode numerik dan eksperimental. Secara keseluruhan, hasil penelitian menunjukkan bahwa masukan panas dan pendinginan cepat CO2 merupakan faktor dominan yang dapat mengurangi tegangan secara signifikan dan mengurangi distorsi sambungan las T yang berbeda.
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Welding is the most matured metal joining manufacturing method used extensively in various industrial applications. Welding-induced residual stress and distortion are among the most studied subjects for welded structures since both can significantly impair the performance and reliability of the welded joint. Computer simulation has been widely used to model a welded joint and perform analytical solutions to predict the magnitude of weld residual stress and distortion. Despite several research and works that have been carried out on this subject, it still poses significant challenges and important areas for further investigation, specifically in dissimilar T-weld joints. T-joint welding is one of the most common structures and equipment for industrial applications, including ships, vessels, and platforms. In addition, dissimilar metal welds are widely used in industry due to specific operating service requirements. Both aspects greatly influence the degree of residual stress and potential distortion of the weld joint. This study investigates the effect of changes in heat input, CO2 rapid cooling, and welding sequences on residual stress and displacement in dissimilar welding T-joints, underpinning the significant factors that can be optimized further for possible mitigating distortion. The study used the finite analysis software ANSYS Workbench and the stem for thermal analysis. Eighteen cases are simulated after the model is validated based on the references, which involve numerical and experimental methods. Overall, the study outcomes reveal that heat inputs and CO2 rapid cooling are dominant factors that can significantly reduce stress and mitigate the distortion of dissimilar T-weld joints

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Finite Element, Residual Stress Reduction, Weld Distortion, Material, Dissimilar, Rapid Cooling.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA174 Computer-aided design. T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics T Technology > TA Engineering (General). Civil engineering (General) > TA492.W4 Welded joints T Technology > TN Mining engineering. Metallurgy > TN879.6 Welding T Technology > TS Manufactures > TS227 Welding.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	BAYU AJI
Date Deposited:	10 Feb 2024 00:12
Last Modified:	10 Feb 2024 00:12
URI:	http://repository.its.ac.id/id/eprint/106677

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