Application of local mechanical tensioning and laser processing to improve structural integrity of multi-pass welds

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dc.contributor.advisor Ganguly, Supriyo Sule, Jibrin 2015-10-07T10:18:05Z 2015-10-07T10:18:05Z 2015-07
dc.description.abstract Multi-pass fusion welding by a filler wire (welding electrode) is normally carried out to join thick steel sections used in most engineering applications. Welded joints in an installation, is the area of critical importance, since they are likely to contain a higher density of defects than the parent metal and their physical properties can differ significantly from the parent metal. Fusion arc welding process relies on intense local heating at a joint where a certain amount of the parent metal is melted and fused with additional metal from the filler wire. The intense local heating causes severe transient thermal gradients in the welded component and the resulting uneven cooling that follows produces a variably distributed residual stress field. In multi-pass welds, multiple thermal cycles resulted in a variably distribution of residual stress field across the weld and through the thickness. These complex thermal stresses generated in welds are undesirable but inevitable during fusion welding. Presence of such tensile residual stresses can be detrimental to the service integrity of a welded structure. In addition to a complex distribution of residual stress state, multi-pass welds also forms dendritic grain structure, which are repeatedly heated, resulting in segregation of alloying elements. Dendritic grain structure is weaker and segregation of alloying elements would result in formation of corrosion microcells as well as reduction in overall corrosion prevention due to depletion of alloying elements. en_UK
dc.language.iso en en_UK
dc.publisher Cranfield University en_UK
dc.rights © Cranfield University, 2015. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder. en_UK
dc.subject Structural steel alloys en_UK
dc.subject Multi-pass welds en_UK
dc.subject Microstructure en_UK
dc.subject Mechanical properties en_UK
dc.subject Residual stress en_UK
dc.subject Neutron diffraction en_UK
dc.subject Rolling en_UK
dc.subject Laser processing en_UK
dc.title Application of local mechanical tensioning and laser processing to improve structural integrity of multi-pass welds en_UK
dc.type Thesis or dissertation en_UK
dc.type.qualificationlevel Doctoral en_UK
dc.type.qualificationname PhD en_UK

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