Thermal Effects in Dissimilar Magnetic Pulse Welding
Magnetic pulse welding (MPW) is often categorized as a cold welding technology, whereas latest studies evidence melted and rapidly cooled regions within the joining interface. These phenomena already occur at very low impact velocities, when the heat input due to plastic deformation is comparatively...
Main Authors: | , , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2019-03-01
|
Series: | Metals |
Subjects: | |
Online Access: | http://www.mdpi.com/2075-4701/9/3/348 |
_version_ | 1811344093524000768 |
---|---|
author | Joerg Bellmann Joern Lueg-Althoff Sebastian Schulze Marlon Hahn Soeren Gies Eckhard Beyer A. Erman Tekkaya |
author_facet | Joerg Bellmann Joern Lueg-Althoff Sebastian Schulze Marlon Hahn Soeren Gies Eckhard Beyer A. Erman Tekkaya |
author_sort | Joerg Bellmann |
collection | DOAJ |
description | Magnetic pulse welding (MPW) is often categorized as a cold welding technology, whereas latest studies evidence melted and rapidly cooled regions within the joining interface. These phenomena already occur at very low impact velocities, when the heat input due to plastic deformation is comparatively low and where jetting in the kind of a distinct material flow is not initiated. As another heat source, this study investigates the cloud of particles (CoP), which is ejected as a result of the high speed impact. MPW experiments with different collision conditions are carried out in vacuum to suppress the interaction with the surrounding air for an improved process monitoring. Long time exposures and flash measurements indicate a higher temperature in the joining gap for smaller collision angles. Furthermore, the CoP becomes a finely dispersed metal vapor because of the higher degree of compression and the increased temperature. These conditions are beneficial for the surface activation of both joining partners. A numerical temperature model based on the theory of liquid state bonding is developed and considers the heating due to the CoP as well as the enthalpy of fusion and crystallization, respectively. The time offset between the heat input and the contact is identified as an important factor for a successful weld formation. Low values are beneficial to ensure high surface temperatures at the time of contact, which corresponds to the experimental results at small collision angles. |
first_indexed | 2024-04-13T19:41:39Z |
format | Article |
id | doaj.art-d808bec857b54daba03614b5d66aef2f |
institution | Directory Open Access Journal |
issn | 2075-4701 |
language | English |
last_indexed | 2024-04-13T19:41:39Z |
publishDate | 2019-03-01 |
publisher | MDPI AG |
record_format | Article |
series | Metals |
spelling | doaj.art-d808bec857b54daba03614b5d66aef2f2022-12-22T02:32:53ZengMDPI AGMetals2075-47012019-03-019334810.3390/met9030348met9030348Thermal Effects in Dissimilar Magnetic Pulse WeldingJoerg Bellmann0Joern Lueg-Althoff1Sebastian Schulze2Marlon Hahn3Soeren Gies4Eckhard Beyer5A. Erman Tekkaya6Institute of Manufacturing Science and Engineering, Technische Universitaet Dresden, George-Baehr-Str. 3c, 01062 Dresden, GermanyInstitute of Forming Technology and Lightweight Components, TU Dortmund University, Baroper Str. 303, 44227 Dortmund, GermanyBusiness Unit Joining, Fraunhofer IWS Dresden, Winterbergstr. 28, 01277 Dresden, GermanyInstitute of Forming Technology and Lightweight Components, TU Dortmund University, Baroper Str. 303, 44227 Dortmund, GermanyInstitute of Forming Technology and Lightweight Components, TU Dortmund University, Baroper Str. 303, 44227 Dortmund, GermanyInstitute of Manufacturing Science and Engineering, Technische Universitaet Dresden, George-Baehr-Str. 3c, 01062 Dresden, GermanyInstitute of Forming Technology and Lightweight Components, TU Dortmund University, Baroper Str. 303, 44227 Dortmund, GermanyMagnetic pulse welding (MPW) is often categorized as a cold welding technology, whereas latest studies evidence melted and rapidly cooled regions within the joining interface. These phenomena already occur at very low impact velocities, when the heat input due to plastic deformation is comparatively low and where jetting in the kind of a distinct material flow is not initiated. As another heat source, this study investigates the cloud of particles (CoP), which is ejected as a result of the high speed impact. MPW experiments with different collision conditions are carried out in vacuum to suppress the interaction with the surrounding air for an improved process monitoring. Long time exposures and flash measurements indicate a higher temperature in the joining gap for smaller collision angles. Furthermore, the CoP becomes a finely dispersed metal vapor because of the higher degree of compression and the increased temperature. These conditions are beneficial for the surface activation of both joining partners. A numerical temperature model based on the theory of liquid state bonding is developed and considers the heating due to the CoP as well as the enthalpy of fusion and crystallization, respectively. The time offset between the heat input and the contact is identified as an important factor for a successful weld formation. Low values are beneficial to ensure high surface temperatures at the time of contact, which corresponds to the experimental results at small collision angles.http://www.mdpi.com/2075-4701/9/3/348magnetic pulse weldingdissimilar metal weldingsolid state weldingwelding windowcloud of particlesjetsurface activation |
spellingShingle | Joerg Bellmann Joern Lueg-Althoff Sebastian Schulze Marlon Hahn Soeren Gies Eckhard Beyer A. Erman Tekkaya Thermal Effects in Dissimilar Magnetic Pulse Welding Metals magnetic pulse welding dissimilar metal welding solid state welding welding window cloud of particles jet surface activation |
title | Thermal Effects in Dissimilar Magnetic Pulse Welding |
title_full | Thermal Effects in Dissimilar Magnetic Pulse Welding |
title_fullStr | Thermal Effects in Dissimilar Magnetic Pulse Welding |
title_full_unstemmed | Thermal Effects in Dissimilar Magnetic Pulse Welding |
title_short | Thermal Effects in Dissimilar Magnetic Pulse Welding |
title_sort | thermal effects in dissimilar magnetic pulse welding |
topic | magnetic pulse welding dissimilar metal welding solid state welding welding window cloud of particles jet surface activation |
url | http://www.mdpi.com/2075-4701/9/3/348 |
work_keys_str_mv | AT joergbellmann thermaleffectsindissimilarmagneticpulsewelding AT joernluegalthoff thermaleffectsindissimilarmagneticpulsewelding AT sebastianschulze thermaleffectsindissimilarmagneticpulsewelding AT marlonhahn thermaleffectsindissimilarmagneticpulsewelding AT soerengies thermaleffectsindissimilarmagneticpulsewelding AT eckhardbeyer thermaleffectsindissimilarmagneticpulsewelding AT aermantekkaya thermaleffectsindissimilarmagneticpulsewelding |