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Engström, Hans
Publications (10 of 46) Show all publications
Håkansson, A., Abrahamsson, L., Kaplan, A., Engström, H., Määttä, A. & Mäntyjärvi, K. (2015). Barriers to implementation of laser welding technology: A study of 11 companies in Scandinavia (ed.). Paper presented at . Manufacturing Science and Technology, 3(2), 48-55
Open this publication in new window or tab >>Barriers to implementation of laser welding technology: A study of 11 companies in Scandinavia
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2015 (English)In: Manufacturing Science and Technology, ISSN 2333-2735, Vol. 3, no 2, p. 48-55Article in journal (Refereed) Published
Keywords
Manufacturing engineering and work sciences - Manufacturing engineering, Industrial engineering and economy - Industrial organisation, administration and economics, technology implementation, barriers, organization, Produktion och arbetsvetenskap - Produktionsteknik, Industriell teknik och ekonomi - Industriell organisation, administration och ekonomi
National Category
Other Engineering and Technologies not elsewhere specified Production Engineering, Human Work Science and Ergonomics Manufacturing, Surface and Joining Technology
Research subject
Industrial Design; Gender and Technology; Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-3350 (URN)10.13189/mst.2015.030205 (DOI)12af4bca-2761-4e91-b282-ffa0ad2fa8dd (Local ID)12af4bca-2761-4e91-b282-ffa0ad2fa8dd (Archive number)12af4bca-2761-4e91-b282-ffa0ad2fa8dd (OAI)
Projects
Forum för Industriell Framtid
Note
Godkänd; 2015; 20150604 (ahak)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-05-16Bibliographically approved
Kaplan, A., Håkansson, A. & Engström, H. (2013). Projekt: Forum för Industriell Framtid. Paper presented at .
Open this publication in new window or tab >>Projekt: Forum för Industriell Framtid
2013 (Swedish)Other (Other (popular science, discussion, etc.))
Abstract [sv]

För att uppnå det övergripande målet att skapa en internationellt konkurrenskraftig regional tillverkningsindustri har projektet följande mål: • Genomföra ett antal högkvalitativa seminarier där experter möter små eller medelstora svenska och finska företag. Seminarierna ska resultera i en ”Agenda för industriell framtid” • Implementera ett antal demonstranter (svetsning) där man kan utveckla och träna operatörer, utveckla nya organisationsformer, testa olika styrsystem, samordna demonstratorer i nätverk och ett antal andra aktiviteter som utvecklats inom ”Agenda för industriell framtid” • Genomföra 20 handlingsprogram (ett för varje företag) där man försöker realisera agendan i anslutning till den etablerade demonstratorn. Målsättningen är att förbättra det ekonomiska omsättningen med 15 % samtidigt som man förbättrar miljön med 15 %. • Arrangera ett internationellt slutseminarium Projektets vision är att regionens tillverkningsindustri kan ses som en av de mest avancerade SME-kulturerna i världen. Baserat på avancerad hög-teknologi lyckas man utveckla innovativa produkter i världsklass, samtidigt som man värnar om ekologisk hållbarhet. Metoder för jämställdhet, som bidrar till att bryta den sneda könsfördelningen inom industrin, har utvecklats. Företagen är konkurrenskraftiga och genererar såväl höga intäkter som en stabilt växande arbetsmarknad.

National Category
Manufacturing, Surface and Joining Technology Other Engineering and Technologies not elsewhere specified
Research subject
Manufacturing Systems Engineering; Industrial Design
Identifiers
urn:nbn:se:ltu:diva-36207 (URN)ac40065b-9ab7-4332-b4f0-476a5020a8a9 (Local ID)ac40065b-9ab7-4332-b4f0-476a5020a8a9 (Archive number)ac40065b-9ab7-4332-b4f0-476a5020a8a9 (OAI)
Note

Publikationer: Samordnad kommunikation: Att lyckas med distansarbete; Barriers to implementation of laser welding technology: A study of 11 companies in Scandinavia; Status: Pågående; Period: 01/10/2011 → 30/06/2014

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Engström, H. & Kaplan, A. (2011). New laser projects to strengthen the manufacturing industry in northern Scandinavia (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. : Department of Geography, Norwegian University of Science and Technology
Open this publication in new window or tab >>New laser projects to strengthen the manufacturing industry in northern Scandinavia
2011 (English)In: 13th NOLAMP Conference: 13th Conference on Laser Materials Processing in the Nordic Countries 27 - 29 June 2011 / [ed] Einar Halmøy, Department of Geography, Norwegian University of Science and Technology, 2011Conference paper, Published paper (Refereed)
Abstract [en]

The industrial development in northern part of Scandinavia has for the last years steadily beengrowing, primarily driven by strong expansion in mining, hydro power and wind powerindustries, which influences the growth and also demand on the mechanical industry in thearea. In order to further develop the competitiveness of manufacturing companies and thepromotion of laser technology in the north of Sweden and Finland, three new laser projectswere approved. These projects will be presented in this paper.. One project at LuleåUniversity of Technology (LTU) will support industry to develop and implement lasers inmanufacturing, combined with further development of an interesting laser process useful forthe regional industry. One project is a cooperation project between LTU and University ofOulu that will focus on developing optimal laser welds in high strength steels using highpower fibre- and disc lasers and evaluation of fatigue properties of the welds. The thirdproject deals with fatigue properties of laser clad surfaces and is a cooperation projectbetween LTU and Centria Research unit of Central Osterbothnia of Applies Sciences,involving also Tampere University of Technology.

Place, publisher, year, edition, pages
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-37471 (URN)b844e4a7-db88-4170-9725-4553cb97b569 (Local ID)b844e4a7-db88-4170-9725-4553cb97b569 (Archive number)b844e4a7-db88-4170-9725-4553cb97b569 (OAI)
Conference
Conference on Laser Materials Processing in the Nordic Countries : 27/06/2011 - 29/06/2011
Note
Godkänd; 2011; 20110901 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically 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
Norman, P., Engström, H., Gren, P. & Kaplan, A. (2008). Correlation between photodiode monitoring and high speed imaging of the dynamics causing laser welding defects (ed.). In: (Ed.), Yongfeng Lu (Ed.), Congress proceedings: ICALEO, 27th International Congress on Applications of Lasers and Electro-Optics : October 20 - 23, 2008 Pechanga Resort & Casino, Temecula, CA, USA ; [includes] Laser Materials Processing Conference, Laser Microprocessing Conference, Nanomanufacturing Conference. Paper presented at International Congress on Applications of Lasers & Electro-Optics : 20/10/2008 - 23/10/2008 (pp. 829-837). Orlando, Fla: Laser institute of America
Open this publication in new window or tab >>Correlation between photodiode monitoring and high speed imaging of the dynamics causing laser welding defects
2008 (English)In: Congress proceedings: ICALEO, 27th International Congress on Applications of Lasers and Electro-Optics : October 20 - 23, 2008 Pechanga Resort & Casino, Temecula, CA, USA ; [includes] Laser Materials Processing Conference, Laser Microprocessing Conference, Nanomanufacturing Conference / [ed] Yongfeng Lu, Orlando, Fla: Laser institute of America , 2008, p. 829-837Conference paper, Published paper (Refereed)
Abstract [en]

Today merely a few monitoring systems for in-process detection of laser welding defects are commercially available. Despite a trend towards cameras, industrially more robust is still a photodiode, measuring in an optically filtered spectral window either the thermal emissions from the melt and vapour or the laser beam reflections. The monitoring rule for each application is identified empirically through correlations between the signal dynamics and welding defects, as the linking mechanism is non-trivial and therefore hardly understood. Thus the method does not provide a systematic guideline to detect a certain welding defect.The here presented approach studies the context between the photodiode signal, the welding defects and the vapour, melt pool, keyhole and temperature dynamics. Simultaneous laser-illuminated high speed imaging is compared to photodiode monitoring at three spectral windows in order to identify through simultaneous timing any linking dynamics in a qualitative manner. Supportive methods are emission modelling and thermal imaging. Several cases of joints, materials and defects were studied to develop an illustrated theoretical description of the defect-signal correlations.

Place, publisher, year, edition, pages
Orlando, Fla: Laser institute of America, 2008
National Category
Manufacturing, Surface and Joining Technology Applied Mechanics
Research subject
Manufacturing Systems Engineering; Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-31093 (URN)75149188220 (Scopus ID)527eedc0-c789-11dd-941d-000ea68e967b (Local ID)978-0-912035-12-3 (ISBN)527eedc0-c789-11dd-941d-000ea68e967b (Archive number)527eedc0-c789-11dd-941d-000ea68e967b (OAI)
Conference
International Congress on Applications of Lasers & Electro-Optics : 20/10/2008 - 23/10/2008
Note
Godkänd; 2008; 20081211 (petern)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Norman, P., Engström, H. & Kaplan, A. (2008). Theoretical analysis of photodiode monitoring of laser welding defects by imaging combined with modelling (ed.). Paper presented at . Journal of Physics D: Applied Physics, 41(19)
Open this publication in new window or tab >>Theoretical analysis of photodiode monitoring of laser welding defects by imaging combined with modelling
2008 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 41, no 19Article in journal (Refereed) Published
Abstract [en]

On-line process monitoring of laser welding defects by detecting characteristic changes of the process emissions via photodiodes has high potential but, due to the complex process, lack of directly interpretable and thus controllable correlations. Deep analysis of the process by high speed imaging in combination with modelling enables one to discuss the correlations between the signal and the process, as was demonstrated for quasi-steady state conditions and for transient phenomena. Despite improved knowledge through the study, several uncertainties like the emissivity, the keyhole radiation characteristics and the temperature field need to be identified more accurately for a complete theoretical description of the signal causes.

National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-13569 (URN)10.1088/0022-3727/41/19/195502 (DOI)000259441800074 ()2-s2.0-53349153469 (Scopus ID)cce37600-a2a7-11dd-8802-000ea68e967b (Local ID)cce37600-a2a7-11dd-8802-000ea68e967b (Archive number)cce37600-a2a7-11dd-8802-000ea68e967b (OAI)
Note
Validerad; 2008; Bibliografisk uppgift: Paper id:: 195502; 20081025 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Engström, H., Norman, P. & Kaplan, A. (2007). DATLAS: a new approach for monitoring the laser welding process (ed.). In: (Ed.), Veli Kujanpää (Ed.), 11th NOLAMP Conference: 11th NOLAMP Conference in Laser Processing of Materials ; Lappeenranta, August 20 - 22,2007. Paper presented at Conference on Laser Materials Processing in the Nordic Countries : 20/08/2007 - 22/08/2007. Lappeenranta: Lappeenranta University of Technology Press
Open this publication in new window or tab >>DATLAS: a new approach for monitoring the laser welding process
2007 (English)In: 11th NOLAMP Conference: 11th NOLAMP Conference in Laser Processing of Materials ; Lappeenranta, August 20 - 22,2007 / [ed] Veli Kujanpää, Lappeenranta: Lappeenranta University of Technology Press, 2007Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Lappeenranta: Lappeenranta University of Technology Press, 2007
Series
Acta Universitatis Lappeenrantaensis, ISSN 1456-4491 ; 273
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-34094 (URN)83343810-f24e-11db-bb1b-000ea68e967b (Local ID)978-952-214-412-6 (ISBN)83343810-f24e-11db-bb1b-000ea68e967b (Archive number)83343810-f24e-11db-bb1b-000ea68e967b (OAI)
Conference
Conference on Laser Materials Processing in the Nordic Countries : 20/08/2007 - 22/08/2007
Note

Godkänd; 2007; 20070424 (cira)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Norman, P., Kaplan, A. & Engström, H. (2007). Modelling of the impact of melt surface dyanmics on a photodiode monitoring signal in laser welding (ed.). In: (Ed.), Yongfeng Lu (Ed.), Congress proceedings: 2007 ICALEO, 26th International Congress on Applications of Lasers & Electro-Optics : October 29 - November 1, 2007, Hilton in the Walt Disney World Resort, Orlando, FL, USA ; [including] Laser Materials Processing Conference, Laser Microprocessing Conference [and] Nanomanufacturing Conference. Paper presented at International Congress on Applications of Lasers & Electro-Optics : 29/10/2007 - 01/11/2007. : Laser institute of America
Open this publication in new window or tab >>Modelling of the impact of melt surface dyanmics on a photodiode monitoring signal in laser welding
2007 (English)In: Congress proceedings: 2007 ICALEO, 26th International Congress on Applications of Lasers & Electro-Optics : October 29 - November 1, 2007, Hilton in the Walt Disney World Resort, Orlando, FL, USA ; [including] Laser Materials Processing Conference, Laser Microprocessing Conference [and] Nanomanufacturing Conference / [ed] Yongfeng Lu, Laser institute of America , 2007Conference paper, Published paper (Refereed)
Abstract [en]

Today merely a few monitoring systems for inprocess detection of laser welding defects are commercially available. Despite a trend towards cameras, the industrially most powerful concept is still a photodiode with optical filter, measuring thermal emissions from the melt surface and from the plasma or laser beam reflections. The monitoring rule for each application is identified empirically through temporal correlations between dynamic signal changes and obtained welding defects. The mechanisms behind are widely not understood. Thus the method does not provide a systematic estimation of success for identifying a certain welding defect. The here presented research approach studies the context between welding defects, the physical mechanisms behind, particularly the dynamics of melt pool, plasma and temperature field, and the photodiode signal. Numerical simulation results of the thermal emissions from the weld pool and keyhole dynamics and their non-linear conversion into a voltage signal are presented. An essential outcome is the sensitivity of the sensor signal to certain sub-mechanisms of the motion for judging under which conditions they can be monitored. Various results are discussed for simplified hypothetic cases as well as for observed weld pool dynamics of practical relevance.

Place, publisher, year, edition, pages
Laser institute of America, 2007
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-35465 (URN)a00bdf40-7e23-11dc-b50c-000ea68e967b (Local ID)978-0-912035-88-8 (ISBN)a00bdf40-7e23-11dc-b50c-000ea68e967b (Archive number)a00bdf40-7e23-11dc-b50c-000ea68e967b (OAI)
Conference
International Congress on Applications of Lasers & Electro-Optics : 29/10/2007 - 01/11/2007
Note
Godkänd; 2007; Bibliografisk uppgift: CD-ROM; 20071019 (petern)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Norman, P., Engström, H. & Kaplan, A. (2007). State-of-the-art of monitoring and imaging of laser welding defects (ed.). In: (Ed.), Veli Kujanpää (Ed.), 11th NOLAMP Conference :: 11th NOLAMP Conference in Laser Processing of Materials ; Lappeenranta, August 20 - 22, 2007. Paper presented at Conference on Laser Materials Processing in the Nordic Countries : 20/08/2007 - 22/08/2007. Lappeenranta: Lappeenranta University of Technology Press
Open this publication in new window or tab >>State-of-the-art of monitoring and imaging of laser welding defects
2007 (English)In: 11th NOLAMP Conference :: 11th NOLAMP Conference in Laser Processing of Materials ; Lappeenranta, August 20 - 22, 2007 / [ed] Veli Kujanpää, Lappeenranta: Lappeenranta University of Technology Press, 2007Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Lappeenranta: Lappeenranta University of Technology Press, 2007
Series
Acta Universitatis Lappeenrantaensis, ISSN 1456-4491 ; 273
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-32507 (URN)7068b4d0-f24f-11db-bb1b-000ea68e967b (Local ID)978-952-214-412-6 (ISBN)7068b4d0-f24f-11db-bb1b-000ea68e967b (Archive number)7068b4d0-f24f-11db-bb1b-000ea68e967b (OAI)
Conference
Conference on Laser Materials Processing in the Nordic Countries : 20/08/2007 - 22/08/2007
Note

Godkänd; 2007; 20070424 (cira)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Engström, H. & Kaplan, A. (2005). Education of Industrial Users of Laser Materials Processing Technology (ed.). In: (Ed.), Alexander Kaplan (Ed.), 10th NOLAMP Conference: the 10th Nordic Laser Materials Processing Conference, 17-19 August 2005, Luleå Sweden. Paper presented at Nordic Laser Materials Processing Conference : 17/08/2005 - 19/08/2005 (pp. 33-40). Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Education of Industrial Users of Laser Materials Processing Technology
2005 (English)In: 10th NOLAMP Conference: the 10th Nordic Laser Materials Processing Conference, 17-19 August 2005, Luleå Sweden / [ed] Alexander Kaplan, Luleå: Luleå tekniska universitet, 2005, p. 33-40Conference paper, Published paper (Refereed)
Abstract [en]

The extensive use of high power laser for materials processing in industry has brought a new era in manufacturing technology. High speed processing with low heat input and high precision offers up-to-date manufacturing. New processes like laser hybrid welding are developed and introduced in industry. But the potential of laser technology is not by far fully utilised due to lack of knowledge of laser processes in the industrial environment.The national Swedish programme, "proDesign - Expert competence in industrial product development and materials processing", offers new opportunities of providing education for industrial managers, designers and manufacturing people. Within the scope of proDesign, Luleå University of Technology has developed several new courses in laser material processing for people in industry. These courses have now uccessfully been introduced to the Swedish market and this paper presents experiences from this work.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2005
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-39732 (URN)e968f910-dc8a-11db-b67f-000ea68e967b (Local ID)91-631-7228-3 (ISBN)e968f910-dc8a-11db-b67f-000ea68e967b (Archive number)e968f910-dc8a-11db-b67f-000ea68e967b (OAI)
Conference
Nordic Laser Materials Processing Conference : 17/08/2005 - 19/08/2005
Note
Godkänd; 2005; 20070327 (cira)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
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