Experimental and finite element analysis of pressure vessel steel SA 387 with submerged arc welding

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Thesis Type: Postgraduate

Institution Of The Thesis: Kocaeli University, Fen Bilimleri Enstitüsü, Makina Mühendisliği Bölümü, Turkey

Approval Date: 2023

Thesis Language: English

Student: MERT TURGUT ŞENOL

Supervisor: Murat Makaraci

Open Archive Collection: AVESIS Open Access Collection

Abstract:

Welding is a metal joining process involving melting and solidification of material. It may be applied in order to join wide range of materials. Melting and solidification stages of material occur with very high temperature gradient but within a small region. The majority of welding techniques include melting the surfaces to be connected, with or without filler metal (including surfacing welds), and then cooling them. Melting is accomplished by applying local heat input, minimising heat diffusion into the component and heat dissipation into the environment. Welding process results into residual stresses, cracking, distortion, formation of Heat Affected Zone and etc. Because heating and cooling stages during welding are uneven. During cooling stages of welded region, contraction of material takes place. Welded region is contracted by surrounding area. Therefore the weld region shows tensile residual stress and the surrounding area shows compressive residual stress after cooling down. It is important for reseachers and design engineers to predict the amount of residual stress and distortion. In this thesis, ANSYS Program was used in order to analyse the specimen and calculate the amount of residual stresses caused by welding inside the specimen. 3D view of specimen was prepared by SpacaClaim Aplication. The main aim of this thesis is to develop a FEA model which can be predict thermal cycle during SAW process and residual stress induced by SAW with higher accuracy compare to experimental test plate. To realize this, Goldak's double ellipsoidal heat source model was used.