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Heat input and temperatures in welding
University West, Department of Engineering Science, Division of Automation Systems. (PTW)ORCID iD: 0000-0001-5734-294X
University West, Department of Engineering Science, Division of Manufacturing Processes. (PTW)ORCID iD: 0000-0002-0234-3168
University West, Department of Engineering Science, Division of Production Engineering. (Welding, PTW)ORCID iD: 0000-0003-2560-0531
2013 (English)In: JOM-17 - International Conference on Joining Materials, JOM-Institute , 2013Conference paper, Published paper (Refereed)
Abstract [en]

A key feature in welding is the energy supplied, in order to join the work pieces together. For all fusion welding methods, the supplied energy is so high that the work-piece joint surfaces are melted and fused together. The energy supplied is then transported away, mainly by conduction through the base materials. The temperature of the weld decreases and a solid joint is eventually formed. This may then undergo phase transformations and finally the weld joint reaches ambient temperature.

The thermal history of a welded joint has a large effect on the microstructure and mechanical properties. Welding metallurgist therefore consider the cooling time t8/5 as crucial to understand the resulting properties of a joint in steel structures. The cooling time is influenced by several factors, like heat input, base material thickness, base material thermal properties, preheat an interpass temperatures etc. Regarding the heat input, the efficiency of the welding arc has for a long time been debated, i.e. how much of the arc energy really goes into the weld. Large efforts are being made to measure this very accurately.

Another significant research field has been to measure or calculate the cooling time of welds, in particular t8/5. However, this cooling time is affected by the arc energy and by the arc efficiency.

In a more macroscopic sense, it has been shown that the temperature of a welded structure can vary with the presence of for example internal heat sinks. Such variations may affect macroscopic properties like penetration. One way to ensure constant condition in terms of temperature could be to increase the heat input if the temperature decreases. However, how such variations affect for example the cooling rate has not been studied.The aim of the present paper is to report some experimental results regarding cooling rate in welded joints and put this into context of arc efficiency and temperature regulations and also discuss how the cooling rate may be affected in more production like welding situations.

Place, publisher, year, edition, pages
JOM-Institute , 2013.
Keyword [en]
cooling times, arc efficiency, heat input, high strength steels, Work-integrated learning, WIL
Keyword [sv]
AIL
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Work Integrated Learning
Identifiers
URN: urn:nbn:se:hv:diva-5584ISBN: 87-89582-21-7 (print)OAI: oai:DiVA.org:hv-5584DiVA, id: diva2:643861
Conference
JOM-17 - International Conference on Joining Materials. Helsingör, Denmark 5-8 May 2013
Available from: 2013-08-28 Created: 2013-08-28 Last updated: 2016-02-09Bibliographically approved

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Sikström, FredrikHurtig, KjellSvensson, Lars-Erik

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