{"id":{"repo_id":"rgu","oai_identifier":"oai:rgu-repository.worktribe.com:2807397"},"canonical_url":"https://search.dev.ndltd.org/etd/rgu/oai:rgu-repository.worktribe.com:2807397","repository":{"repo_id":"rgu","name":"Robert Gordon University","base_url":"https://rgu-repository.worktribe.com/oaiprovider"},"display":{"title":"Development and modelling of weld cooling time equations.","abstract":"The work reported in this thesis investigates ways of developing and modelling weld cooling time equations. This is an important topic as the susceptibility of a weld's heat affected zone to hydrogen cracking is largely governed by the severity of the cooling portion of the weld's thermal cycle. The 800 to 500 °C cooling time is particularly critical. A model to link the weld bead geometry to the 8OO to 500 °C cooling time for submerged arc welding has been developed. This model combined with the existing work in this field indicates that the role of the weld pool shape and the arc efficiency in determining the cooling behaviour requires investigation. These investigations are undertaken in this work. A theoretical case is developed that indicates that the shape of the weld pool could influence the cooling behaviour. A series of carefully designed experiments indicate that in practice the weld pool shape has no influence on the cooling behaviour. Evidence is presented that the level of the welding process parameters influences the level of the arc efficiency. The arc efficiency is important as it describes the energy lost from the electrical welding arc. A new method of measuring the arc efficiency has been developed, this method is deemed to be superior to the existing methods. Using this new method the effect of the welding process variables on the arc efficiency has been investigated. In conclusion this thesis leads to an improved understanding and prediction of the cooling behaviour of fusion welds.","abstract_html":"The work reported in this thesis investigates ways of developing and modelling weld cooling time equations. This is an important topic as the susceptibility of a weld's heat affected zone to hydrogen cracking is largely governed by the severity of the cooling portion of the weld's thermal cycle. The 800 to 500 °C cooling time is particularly critical. A model to link the weld bead geometry to the 8OO to 500 °C cooling time for submerged arc welding has been developed. This model combined with the existing work in this field indicates that the role of the weld pool shape and the arc efficiency in determining the cooling behaviour requires investigation. These investigations are undertaken in this work. A theoretical case is developed that indicates that the shape of the weld pool could influence the cooling behaviour. A series of carefully designed experiments indicate that in practice the weld pool shape has no influence on the cooling behaviour. Evidence is presented that the level of the welding process parameters influences the level of the arc efficiency. The arc efficiency is important as it describes the energy lost from the electrical welding arc. A new method of measuring the arc efficiency has been developed, this method is deemed to be superior to the existing methods. Using this new method the effect of the welding process variables on the arc efficiency has been investigated. In conclusion this thesis leads to an improved understanding and prediction of the cooling behaviour of fusion welds.","abstract_has_math":false,"creators":["Grant, Ian A."],"institution":"Robert Gordon's Institute of Technology","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["J.C. McGlone, D. Kirkwood and J.C. Lochhead"],"committee_chairs":[],"committee_members":[],"year":1991,"date_issued":"1991","date_published":"1991","updated_at":"2026-07-24T04:10:09Z","subjects":["Submerged arc welding","Welds","Cooling time equation","Hydrogen cracking","Bead geometry","Arc efficiency"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["oai:rgu-repository.worktribe.com:2807397","https://doi.org/10.48526/rgu-wt-2807397"],"render_values":[{"text":"oai:rgu-repository.worktribe.com:2807397","href":null,"code":true},{"text":"https://doi.org/10.48526/rgu-wt-2807397","href":"https://doi.org/10.48526/rgu-wt-2807397","code":true}]}]},"links":{"outbound_url":"https://rgu-repository.worktribe.com/2807397/1/GRANT%201991%20Development%20and%20modelling%20of%20weld","outbound_label":"Repository record","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["J.C. 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This is an important topic as the susceptibility of a weld's heat affected zone to hydrogen cracking is largely governed by the severity of the cooling portion of the weld's thermal cycle. The 800 to 500 °C cooling time is particularly critical. A model to link the weld bead geometry to the 8OO to 500 °C cooling time for submerged arc welding has been developed. This model combined with the existing work in this field indicates that the role of the weld pool shape and the arc efficiency in determining the cooling behaviour requires investigation. These investigations are undertaken in this work. A theoretical case is developed that indicates that the shape of the weld pool could influence the cooling behaviour. A series of carefully designed experiments indicate that in practice the weld pool shape has no influence on the cooling behaviour. Evidence is presented that the level of the welding process parameters influences the level of the arc efficiency. The arc efficiency is important as it describes the energy lost from the electrical welding arc. A new method of measuring the arc efficiency has been developed, this method is deemed to be superior to the existing methods. Using this new method the effect of the welding process variables on the arc efficiency has been investigated. In conclusion this thesis leads to an improved understanding and prediction of the cooling behaviour of fusion welds."]},{"key":"dc:title","label":"Title","values":["Development and modelling of weld cooling time equations."]}]}],"canonical_facts":{"dc:contributor.advisor":["J.C. McGlone, D. Kirkwood and J.C. Lochhead"],"dc:contributor.sponsor":["No Funder Acknowledged (Outputs)"],"dc:creator":["Grant, Ian A."],"dc:date":["1991-03-31"],"dc:date.issued":["1991"],"dc:description.abstract":["The work reported in this thesis investigates ways of developing and modelling weld cooling time equations. 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The arc efficiency is important as it describes the energy lost from the electrical welding arc. A new method of measuring the arc efficiency has been developed, this method is deemed to be superior to the existing methods. Using this new method the effect of the welding process variables on the arc efficiency has been investigated. In conclusion this thesis leads to an improved understanding and prediction of the cooling behaviour of fusion welds."],"dc:identifier":["oai:rgu-repository.worktribe.com:2807397","https://doi.org/10.48526/rgu-wt-2807397"],"dc:identifier.uri":["https://rgu-repository.worktribe.com/2807397/1/GRANT%201991%20Development%20and%20modelling%20of%20weld"],"dc:language":["en"],"dc:publisher.institution":["Robert Gordon's Institute of Technology"],"dc:relation.isreferencedby":["https://rgu-repository.worktribe.com/output/2807397"],"dc:subject":["Submerged arc welding","Welds","Cooling time equation","Hydrogen cracking","Bead geometry","Arc efficiency"],"dc:title":["Development and modelling of weld cooling time equations."],"dc:type":["Thesis"]},"updated_at":"2026-07-24T04:10:09Z"}