Change search
Link to record
Permanent link

Direct link
BETA
Norman, Peter
Publications (10 of 31) Show all publications
Lamas, J., Karlsson, J. E., Norman, P., Powell, J., Kaplan, A. & Yañez, A. (2013). The effect of fit-up geometry on melt flow and weld quality in laser hybrid welding (ed.). Journal of laser applications, 25(3)
Open this publication in new window or tab >>The effect of fit-up geometry on melt flow and weld quality in laser hybrid welding
Show others...
2013 (English)In: Journal of laser applications, ISSN 1042-346X, E-ISSN 1938-1387, Vol. 25, no 3Article in journal (Refereed) Published
Abstract [en]

Hybrid laser-arc welding has a good tolerance to poor fit up as compared to simple laser welding. For a butt joint, the joint fit-up variations can be reduced to two local properties: the gap width and the vertical edge mismatch. The impact of these two properties on the resulting weld quality has been studied systematically in this paper. The original edges as well as the resulting weld surface topography have been scanned in three dimensions in order to study trends. During hybrid welding, the melt flow and the electric arc were observed at the top surface by high speed imaging to analyze the complex fluid flow phenomena.

National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-2585 (URN)10.2351/1.4799556 (DOI)000322535700011 ()2-s2.0-84877256245 (Scopus ID)03841559-c98c-462c-b616-2729658b2a4b (Local ID)03841559-c98c-462c-b616-2729658b2a4b (Archive number)03841559-c98c-462c-b616-2729658b2a4b (OAI)
Note

Validerad; 2013; Bibliografisk uppgift: Article no 032010 ; 20130417 (ysko)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-08-23Bibliographically approved
Kaplan, A., Soldatov, A., Noël, M., Norman, P., Eriksson, I., Powell, J., . . . Baughman, R. (2012). Incorporation of CNT-yarns into metals by laser melting of powder (ed.). In: (Ed.), (Ed.), 31st International Congress on Applications of Lasers and Electro-Optics (ICALEO) Proceedings: . Paper presented at International Congress on Applications of Lasers and Electro-Optics : 23/09/2012 - 27/09/2012 (pp. 1239-1246). : Laser institute of America
Open this publication in new window or tab >>Incorporation of CNT-yarns into metals by laser melting of powder
Show others...
2012 (English)In: 31st International Congress on Applications of Lasers and Electro-Optics (ICALEO) Proceedings, Laser institute of America , 2012, p. 1239-1246Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Laser institute of America, 2012
National Category
Manufacturing, Surface and Joining Technology Other Physics Topics
Research subject
Manufacturing Systems Engineering; Experimental physics
Identifiers
urn:nbn:se:ltu:diva-38373 (URN)cbf32c4a-32df-469e-b601-d2e84c7b1ede (Local ID)978-0-912035-96-3 (ISBN)cbf32c4a-32df-469e-b601-d2e84c7b1ede (Archive number)cbf32c4a-32df-469e-b601-d2e84c7b1ede (OAI)
Conference
International Congress on Applications of Lasers and Electro-Optics : 23/09/2012 - 27/09/2012
Note
Godkänd; 2012; 20130513 (maxnoe)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-04-25Bibliographically approved
Norman, P., Wiklund, G., Janiak, P. & Kaplan, A. (2011). Comparison of 22MnB5-steel with and without AlSi-coating during laser hybrid arc welding (ed.). In: (Ed.), Einar Halmøy (Ed.), 13th NOLAMP Conference: 13th Conference on Laser Materials Processing in the Nordic Countries 27 - 29 June 2011. Paper presented at Conference on Laser Materials Processing in the Nordic Countries : 27/06/2011 - 29/06/2011. Trondheim: Department of Geography, Norwegian University of Science and Technology
Open this publication in new window or tab >>Comparison of 22MnB5-steel with and without AlSi-coating during laser hybrid arc welding
2011 (English)In: 13th NOLAMP Conference: 13th Conference on Laser Materials Processing in the Nordic Countries 27 - 29 June 2011 / [ed] Einar Halmøy, Trondheim: Department of Geography, Norwegian University of Science and Technology, 2011Conference paper, Published paper (Refereed)
Abstract [en]

22MnB5/Usibor1500 is a hot-dip aluminized manganese-boron steel grade that is used withinthe car manufacturing industry and as lasers are increasingly used for welding of the car bodythe amount of research concerning laser welding of this material follows. For thicker materialthe laser hybrid arc welding process has grown to a well-known tool to increase productivity,but for thinner materials the advantages are less obvious. In the present research the melt pooland wire drop transfer was observed with a high speed camera. Differences between welding,with and without the coating were clearly visible and are described and discussed in the paper.The resulting welds were examined microscopically and chemically to unveil the compositionof the material. It is aimed to avoid possible brittle inter-metallic phases directly during theprocess, hence by skipping the usual additional manufacturing step of removing the AlSicoatingin advance.

Place, publisher, year, edition, pages
Trondheim: Department of Geography, Norwegian University of Science and Technology, 2011
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-31954 (URN)6484da26-5cc8-4a4d-a396-71c2075c000d (Local ID)6484da26-5cc8-4a4d-a396-71c2075c000d (Archive number)6484da26-5cc8-4a4d-a396-71c2075c000d (OAI)
Conference
Conference on Laser Materials Processing in the Nordic Countries : 27/06/2011 - 29/06/2011
Note
Godkänd; 2011; 20110901 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Norman, P., Karlsson, J. & Kaplan, A. (2011). Mechanisms forming undercuts during laser hybrid arc welding (ed.). Paper presented at WLT Conference on Lasers in Manufacturing : 23/05/2011 - 26/05/2011. Physics Procedia, 12(1), 201-207
Open this publication in new window or tab >>Mechanisms forming undercuts during laser hybrid arc welding
2011 (English)In: Physics Procedia, ISSN 1875-3892, E-ISSN 1875-3892, Vol. 12, no 1, p. 201-207Article in journal (Refereed) Published
Abstract [en]

That the final quality of a welded joint, using a laser hybrid arc process, is sensitive not only to the geometrical joint conditions, but also to the content of elements in the surface itself, is already known. However the description of the mechanisms forming undercut defects is still vague. In the following study two kinds of undercuts were identified. It is shown how the mill scales affects the melt motion and what mechanisms actuate the creation of the defects. The conclusion that surface oxides affect the severity of weld undercuts is straight forward but here also the mechanism is explained. Keywords: laser; hybrid; welding; mill scale; oxides; defects; undercut

National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-31549 (URN)10.1016/j.phpro.2011.03.026 (DOI)000298054100025 ()2-s2.0-79959428668 (Scopus ID)5c5c549a-c578-4e66-bba6-d5ffc4385840 (Local ID)5c5c549a-c578-4e66-bba6-d5ffc4385840 (Archive number)5c5c549a-c578-4e66-bba6-d5ffc4385840 (OAI)
Conference
WLT Conference on Lasers in Manufacturing : 23/05/2011 - 26/05/2011
Note

Validerad;2011;20110505 (andbra);Konferensartikel i tidskrift;Bibliografisk uppgift: Lasers in Manufacturing 2011 - Proceedings of the Sixth International WLT Conference on Lasers in Manufacturing.

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-07-10Bibliographically approved
Karlsson, J., Norman, P., Kaplan, A., Rubin, P., Lamas, J. & Yañez, A. (2011). Observation of the mechanisms causing two kinds of undercut during laser hybrid arc welding (ed.). Paper presented at . Applied Surface Science, 257(17), 7501-7506
Open this publication in new window or tab >>Observation of the mechanisms causing two kinds of undercut during laser hybrid arc welding
Show others...
2011 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 257, no 17, p. 7501-7506Article in journal (Refereed) Published
Abstract [en]

Two different kinds of undercut were identified when laser hybrid welding hot rolled HSLA-steel in either the as-rolled condition or with the top surface mill scale removed. The presence of mill scale on the steel surface was found to give a sharp angled undercut combined with a sharp oxide inclusion at the edge of the weld which would have the same mechanical effect as a crack in this position. Removal of the surface oxides before welding resulted in the elimination of the oxide inclusions and a more rounded undercut geometry indicative of superior mechanical properties, particularly fatigue life. The mechanisms of the formation of both types of undercut have been analysed by high speed photography and SEM.

National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-4307 (URN)10.1016/j.apsusc.2011.03.068 (DOI)000290790900024 ()2-s2.0-79957454687 (Scopus ID)23cf4b4d-15ea-40b3-b9e3-8f19ce9975b1 (Local ID)23cf4b4d-15ea-40b3-b9e3-8f19ce9975b1 (Archive number)23cf4b4d-15ea-40b3-b9e3-8f19ce9975b1 (OAI)
Note
Validerad; 2011; 20110425 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Kaplan, A., Lamas, J., Karlsson, J., Norman, P. & Yañez, A. (2011). Scanner analysis of the topology of laser hybrid welds depending on the joint edge tolerances (ed.). In: (Ed.), Einar Halmøy (Ed.), 13th NOLAMP Conference: 13th Conference on Laser Materials Proce Nordic Countries 27 - 29 June 2011. Paper presented at Conference on Laser Materials Processing in the Nordic Countries : 27/06/2011 - 29/06/2011. Trondheim: Department of Geography, Norwegian University of Science and Technology
Open this publication in new window or tab >>Scanner analysis of the topology of laser hybrid welds depending on the joint edge tolerances
Show others...
2011 (English)In: 13th NOLAMP Conference: 13th Conference on Laser Materials Proce Nordic Countries 27 - 29 June 2011 / [ed] Einar Halmøy, Trondheim: Department of Geography, Norwegian University of Science and Technology, 2011Conference paper, Published paper (Refereed)
Abstract [en]

The surface geometry after laser hybrid arc welding is an important quality criterion. What isoften called welding in a rough industrial environment can in many cases systematically bereduced to a few local conditions of the joint edge during welding, particularly depending onthe edge preparation technique. In the present study, beside the influence of surface oxidesstudied in separate publications, the conditions are reduced to the local gap width, verticalsurface position and edge mismatch. Gas cut edge conditions are compared to milling andlaser cutting. By scanning the steel edges of a 10 mm butt joint before and during hybridwelding and relating the systematic variation of the above three properties to the scannedtopology of the resulting weld, quantitative correlations are identified. By the aid of highspeed imaging, explanations for the trends can be found. Operating windows with controllabletrends can be quantitatively mapped and distinguished from instable regimes. Beside higherroughness, gas cut edges show a superimposed edge oscillation of longer periodicity, beingless visible but important. During welding, concave surface bending and gap widening alterthe initial conditions. Awareness and quantitative identification of the edge conditions isrecommended to control the welding process in a rough industrial environment.

Place, publisher, year, edition, pages
Trondheim: Department of Geography, Norwegian University of Science and Technology, 2011
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-27870 (URN)170c13a7-a901-47a1-bb0d-a6775ed84829 (Local ID)170c13a7-a901-47a1-bb0d-a6775ed84829 (Archive number)170c13a7-a901-47a1-bb0d-a6775ed84829 (OAI)
Conference
Conference on Laser Materials Processing in the Nordic Countries : 27/06/2011 - 29/06/2011
Note
Godkänd; 2011; 20110901 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Powell, J., Lamas, J., Karlsson, J., Norman, P., Kaplan, A. & Yañez, A. (2011). The sensitivity of hybrid laser welding to variations in workpiece position (ed.). Paper presented at WLT Conference on Lasers in Manufacturing : 23/05/2011 - 26/05/2011. Physics Procedia, 12(1), 188-193
Open this publication in new window or tab >>The sensitivity of hybrid laser welding to variations in workpiece position
Show others...
2011 (English)In: Physics Procedia, ISSN 1875-3892, E-ISSN 1875-3892, Vol. 12, no 1, p. 188-193Article in journal (Refereed) Published
Abstract [en]

High speed imaging has been used to analyze the sensitivity of the Hybrid laser welding process to variations in the laser-arcworkpiece geometry along the axis of the laser beam. The welding process was found to be stable within a certain range of workpiece positions. Outside of this range the process became unstable. If the workpiece was too close to the laser/arc combination, the two energy sources did not supplement each other sufficiently. If the workpiece was too far away the droplets from the arc interfered with the laser-keyhole interaction.

National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-27042 (URN)10.1016/j.phpro.2011.03.024 (DOI)000298054100023 ()2-s2.0-79959382550 (Scopus ID)05904565-7378-4da9-a5bc-a5a99addf5bf (Local ID)05904565-7378-4da9-a5bc-a5a99addf5bf (Archive number)05904565-7378-4da9-a5bc-a5a99addf5bf (OAI)
Conference
WLT Conference on Lasers in Manufacturing : 23/05/2011 - 26/05/2011
Note

Validerad;2011;20110505 (andbra); Konferensartikel i tidskrift;Bibliografisk uppgift: Lasers in Manufacturing 2011 - Proceedings of the Sixth International WLT Conference on Lasers in Manufacturing

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-07-10Bibliographically approved
Norman, P., Kaplan, A. & Karlsson, J. (2010). Classification and generalization of data from a fibre-laser hybrid welding case (ed.). Paper presented at International Conference on Laser Assisted Net Shape Engineering : 21/09/2010 - 24/09/2010. Physics Procedia, 5(2), 69-76
Open this publication in new window or tab >>Classification and generalization of data from a fibre-laser hybrid welding case
2010 (English)In: Physics Procedia, ISSN 1875-3892, E-ISSN 1875-3892, Vol. 5, no 2, p. 69-76Article in journal (Refereed) Published
Keywords
Materials science - Other processing/assembly, Teknisk materialvetenskap - Övrig bearbetning/sammanfogning
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-31448 (URN)10.1016/j.phpro.2010.08.031 (DOI)000287100800009 ()2-s2.0-79551655949 (Scopus ID)59fe08b0-0927-11e0-b767-000ea68e967b (Local ID)59fe08b0-0927-11e0-b767-000ea68e967b (Archive number)59fe08b0-0927-11e0-b767-000ea68e967b (OAI)
Conference
International Conference on Laser Assisted Net Shape Engineering : 21/09/2010 - 24/09/2010
Note
Godkänd; 2010; 20110222 (andbra); Konferensartikel i tidskriftAvailable from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-07-10Bibliographically approved
Engström, H., Norman, P. & Karlsson, J. (2010). Hybridsvetsning av lastbilskomponenter med 15 kW fiberlaser och MAG (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Hybridsvetsning av lastbilskomponenter med 15 kW fiberlaser och MAG
2010 (Swedish)Report (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2010. p. 42
Series
Technical report / Luleå University of Technology, ISSN 1402-1536
Keywords
Materials science - Other processing/assembly, Teknisk materialvetenskap - Övrig bearbetning/sammanfogning
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-23332 (URN)688acb70-0913-11e0-b767-000ea68e967b (Local ID)978-91-7439-200-5 (ISBN)688acb70-0913-11e0-b767-000ea68e967b (Archive number)688acb70-0913-11e0-b767-000ea68e967b (OAI)
Note
Godkänd; 2010; 20101216 (petern)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Kaplan, A., Norman, P. & Eriksson, I. (2009). Analysis of the keyhole and weld pool dynamics by imaging evaluation and photodiode monitoring (ed.). In: (Ed.), (Ed.), Proceedings of LAMP2009: The 5th International Congress on Laser Advanced Materials Processing ; LPM2009, the 10th International Symposium on Laser Precision Microfabrication ; HPL2009, the 5th International Symposium on High Power Laser Processing ; Kobe, June 29 - July 2, 2009 ; [congress program & technical digest]. Paper presented at International Congress on Laser Advanced Materials Processing : 29/06/2009 - 02/07/2009. Tokyo: Sumitomo Corp.
Open this publication in new window or tab >>Analysis of the keyhole and weld pool dynamics by imaging evaluation and photodiode monitoring
2009 (English)In: Proceedings of LAMP2009: The 5th International Congress on Laser Advanced Materials Processing ; LPM2009, the 10th International Symposium on Laser Precision Microfabrication ; HPL2009, the 5th International Symposium on High Power Laser Processing ; Kobe, June 29 - July 2, 2009 ; [congress program & technical digest], Tokyo: Sumitomo Corp. , 2009Conference paper, Published paper (Refereed)
Abstract [en]

Process monitoring of laser welding defects by commercial systems based on photodiodes has high potential, but improved understanding is desirable for more systematic industrial use. The signal is generated from spectrally filtered emissions or reflections from the dynamic welding process. Improved knowledge on the cause of the signal was achieved by accompanying high speed imaging. Numerical evaluation of the images and subsequent modelling provided additional information to judge the potential and limits of commercial photodiode sensors. For welding with a 3 kW Nd:YAG-laser, a 15 kW fibre laser or a 14 kW CO2-laser, various joint cases were studied with respect to defects like craters, spatter, blowholes, underfill, root drop-out, lack of penetration, lack of fusion or pores. From the findings a more general theoretical description of the links between the welding process, the defect mechanism and the generated signal was initiated.

Place, publisher, year, edition, pages
Tokyo: Sumitomo Corp., 2009
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-31743 (URN)60187ec0-e64a-11de-bae5-000ea68e967b (Local ID)60187ec0-e64a-11de-bae5-000ea68e967b (Archive number)60187ec0-e64a-11de-bae5-000ea68e967b (OAI)
Conference
International Congress on Laser Advanced Materials Processing : 29/06/2009 - 02/07/2009
Note
Godkänd; 2009; 20091211 (alka)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Organisations

Search in DiVA

Show all publications