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Norman, Peter
Publikationer (10 of 31) Visa alla publikationer
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)
Öppna denna publikation i ny flik eller fönster >>The effect of fit-up geometry on melt flow and weld quality in laser hybrid welding
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2013 (Engelska)Ingår i: Journal of laser applications, ISSN 1042-346X, E-ISSN 1938-1387, Vol. 25, nr 3Artikel i tidskrift (Refereegranskat) 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.

Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsutveckling
Identifikatorer
urn:nbn:se:ltu:diva-2585 (URN)10.2351/1.4799556 (DOI)000322535700011 ()2-s2.0-84877256245 (Scopus ID)03841559-c98c-462c-b616-2729658b2a4b (Lokalt ID)03841559-c98c-462c-b616-2729658b2a4b (Arkivnummer)03841559-c98c-462c-b616-2729658b2a4b (OAI)
Anmärkning

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

Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-08-23Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>Incorporation of CNT-yarns into metals by laser melting of powder
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2012 (Engelska)Ingår i: 31st International Congress on Applications of Lasers and Electro-Optics (ICALEO) Proceedings, Laser institute of America , 2012, s. 1239-1246Konferensbidrag, Publicerat paper (Refereegranskat)
Ort, förlag, år, upplaga, sidor
Laser institute of America, 2012
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik Annan fysik
Forskningsämne
Produktionsutveckling; Experimentell fysik
Identifikatorer
urn:nbn:se:ltu:diva-38373 (URN)cbf32c4a-32df-469e-b601-d2e84c7b1ede (Lokalt ID)978-0-912035-96-3 (ISBN)cbf32c4a-32df-469e-b601-d2e84c7b1ede (Arkivnummer)cbf32c4a-32df-469e-b601-d2e84c7b1ede (OAI)
Konferens
International Congress on Applications of Lasers and Electro-Optics : 23/09/2012 - 27/09/2012
Anmärkning
Godkänd; 2012; 20130513 (maxnoe)Tillgänglig från: 2016-10-03 Skapad: 2016-10-03 Senast uppdaterad: 2018-04-25Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>Comparison of 22MnB5-steel with and without AlSi-coating during laser hybrid arc welding
2011 (Engelska)Ingår i: 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, 2011Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
Trondheim: Department of Geography, Norwegian University of Science and Technology, 2011
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsutveckling
Identifikatorer
urn:nbn:se:ltu:diva-31954 (URN)6484da26-5cc8-4a4d-a396-71c2075c000d (Lokalt ID)6484da26-5cc8-4a4d-a396-71c2075c000d (Arkivnummer)6484da26-5cc8-4a4d-a396-71c2075c000d (OAI)
Konferens
Conference on Laser Materials Processing in the Nordic Countries : 27/06/2011 - 29/06/2011
Anmärkning
Godkänd; 2011; 20110901 (ysko)Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2017-11-25Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>Mechanisms forming undercuts during laser hybrid arc welding
2011 (Engelska)Ingår i: Physics Procedia, ISSN 1875-3892, E-ISSN 1875-3892, Vol. 12, nr 1, s. 201-207Artikel i tidskrift (Refereegranskat) 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

Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsutveckling
Identifikatorer
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 (Lokalt ID)5c5c549a-c578-4e66-bba6-d5ffc4385840 (Arkivnummer)5c5c549a-c578-4e66-bba6-d5ffc4385840 (OAI)
Konferens
WLT Conference on Lasers in Manufacturing : 23/05/2011 - 26/05/2011
Anmärkning

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

Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>Observation of the mechanisms causing two kinds of undercut during laser hybrid arc welding
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2011 (Engelska)Ingår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 257, nr 17, s. 7501-7506Artikel i tidskrift (Refereegranskat) 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.

Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsutveckling
Identifikatorer
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 (Lokalt ID)23cf4b4d-15ea-40b3-b9e3-8f19ce9975b1 (Arkivnummer)23cf4b4d-15ea-40b3-b9e3-8f19ce9975b1 (OAI)
Anmärkning
Validerad; 2011; 20110425 (ysko)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>Scanner analysis of the topology of laser hybrid welds depending on the joint edge tolerances
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2011 (Engelska)Ingår i: 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, 2011Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
Trondheim: Department of Geography, Norwegian University of Science and Technology, 2011
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsutveckling
Identifikatorer
urn:nbn:se:ltu:diva-27870 (URN)170c13a7-a901-47a1-bb0d-a6775ed84829 (Lokalt ID)170c13a7-a901-47a1-bb0d-a6775ed84829 (Arkivnummer)170c13a7-a901-47a1-bb0d-a6775ed84829 (OAI)
Konferens
Conference on Laser Materials Processing in the Nordic Countries : 27/06/2011 - 29/06/2011
Anmärkning
Godkänd; 2011; 20110901 (ysko)Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2017-11-25Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>The sensitivity of hybrid laser welding to variations in workpiece position
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2011 (Engelska)Ingår i: Physics Procedia, ISSN 1875-3892, E-ISSN 1875-3892, Vol. 12, nr 1, s. 188-193Artikel i tidskrift (Refereegranskat) 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.

Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsutveckling
Identifikatorer
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 (Lokalt ID)05904565-7378-4da9-a5bc-a5a99addf5bf (Arkivnummer)05904565-7378-4da9-a5bc-a5a99addf5bf (OAI)
Konferens
WLT Conference on Lasers in Manufacturing : 23/05/2011 - 26/05/2011
Anmärkning

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

Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>Classification and generalization of data from a fibre-laser hybrid welding case
2010 (Engelska)Ingår i: Physics Procedia, ISSN 1875-3892, E-ISSN 1875-3892, Vol. 5, nr 2, s. 69-76Artikel i tidskrift (Refereegranskat) Published
Nyckelord
Materials science - Other processing/assembly, Teknisk materialvetenskap - Övrig bearbetning/sammanfogning
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsutveckling
Identifikatorer
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 (Lokalt ID)59fe08b0-0927-11e0-b767-000ea68e967b (Arkivnummer)59fe08b0-0927-11e0-b767-000ea68e967b (OAI)
Konferens
International Conference on Laser Assisted Net Shape Engineering : 21/09/2010 - 24/09/2010
Anmärkning
Godkänd; 2010; 20110222 (andbra); Konferensartikel i tidskriftTillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Engström, H., Norman, P. & Karlsson, J. (2010). Hybridsvetsning av lastbilskomponenter med 15 kW fiberlaser och MAG (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Öppna denna publikation i ny flik eller fönster >>Hybridsvetsning av lastbilskomponenter med 15 kW fiberlaser och MAG
2010 (Svenska)Rapport (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Luleå: Luleå tekniska universitet, 2010. s. 42
Serie
Teknisk rapport / Luleå tekniska universitet, ISSN 1402-1536
Nyckelord
Materials science - Other processing/assembly, Teknisk materialvetenskap - Övrig bearbetning/sammanfogning
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsutveckling
Identifikatorer
urn:nbn:se:ltu:diva-23332 (URN)688acb70-0913-11e0-b767-000ea68e967b (Lokalt ID)978-91-7439-200-5 (ISBN)688acb70-0913-11e0-b767-000ea68e967b (Arkivnummer)688acb70-0913-11e0-b767-000ea68e967b (OAI)
Anmärkning
Godkänd; 2010; 20101216 (petern)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2017-11-24Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>Analysis of the keyhole and weld pool dynamics by imaging evaluation and photodiode monitoring
2009 (Engelska)Ingår i: 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. , 2009Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
Tokyo: Sumitomo Corp., 2009
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsutveckling
Identifikatorer
urn:nbn:se:ltu:diva-31743 (URN)60187ec0-e64a-11de-bae5-000ea68e967b (Lokalt ID)60187ec0-e64a-11de-bae5-000ea68e967b (Arkivnummer)60187ec0-e64a-11de-bae5-000ea68e967b (OAI)
Konferens
International Congress on Laser Advanced Materials Processing : 29/06/2009 - 02/07/2009
Anmärkning
Godkänd; 2009; 20091211 (alka)Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2017-11-25Bibliografiskt granskad
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