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| 2. |
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| 3. |
- Dimenäs, Jörgen, et al.
(författare)
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Några preliminära resultat av en utvärdering av Försvarshögskolans verksamhetsförlagda utbildning. Paper presenterat på VILÄR 2011, 8-9 december, Skövde
- 2011
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Officersutbildningen i Sverige har under senare tid förändrats i takt med Försvarsmaktens förändrade uppdrag. Det finns tydligt uttalade mål om att officersutbildningen skall präglas av och utvecklas mot högskolemässighet och därtill följande forskningsanknytning. Utbildningens utgångspunkt är att verksamheten skall integreras och utvecklas i ett nära samarbete med Försvarsmakten. Ett speciellt fokus i utvecklingen av officersprogrammet utgörs av dess verksamhetsförlagda delar i utbildningen (VFU). Frågor som man speciellt fokuserar på inom den förändrade officersutbildningen är relationen mellan de högskole- och verksamhetsförlagda delarna. Häri innefattas exempelvis utbildningens progression, vetenskapliga grund och undervisnings- och examinationsformer. Föreliggande presentation syftar till att speciellt beskriva och belysa konsekvenser av verksamhetsförlagda moment utifrån ett integrativt perspektiv på hela officersutbildningen och hur dessa skrivs fram i olika styrdokument. Data erhålls genom dokumentanalys och intervjuer.
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| 4. |
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| 5. |
- Fahlström, Karl, et al.
(författare)
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Distortion Analysis in Laser Welding of Ultra High Strength Steel
- 2014
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Ingår i: Proceedings of the 6th International Swedish Production Symposium 2014. - 9789198097412 ; , s. 1-9
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Konferensbidrag (refereegranskat)abstract
- Due to increased demands on reduced weight in automotive industries, the use of ultra high strength steels (UHSS) has increased. When laser welding UHSS sheets, heating and cooling of the material will cause geometrical distortions and may cause low joint quality. 700 mm long U-beam structures of 1 mm thick boron steel simulating structural pillars in body-in-white constructions have been welded along the flanges with different welding speeds to investigate distortions and weld quality. The results show that final distortions appear in the range of 0-8 mm. FE simulation methods have also been presented which generally predict the distribution of welding distortions.
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| 6. |
- Harati, Ebrahim, 1986-, et al.
(författare)
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Effect of HFMI treatment procedure on weld toe geometry and fatigue properties of high strength steel welds
- 2016
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Ingår i: Procedia Structural Integrity. - : Elsevier. - 2452-3216. ; 2, s. 3483-3490
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Tidskriftsartikel (refereegranskat)abstract
- The effects of high frequency mechanical impact (HFMI) treatment procedure on the weld toe geometry and fatigue strength in 1300 MPa yield strength steel welds were investigated. In this regard first the effect of three or six run treatments on the weld toe geometry was evaluated. The fatigue strength and weld toe geometry of as-welded and HFMI treated samples was then compared. Fatigue testing was done under fully reversed, constant amplitude bending load. When increasing the number of treatment runs from three to six, the weld toe radius and width of treatment remained almost constant. However, a slightly smaller depth of treatment in the base metal and a somewhat larger depth of treatment in the weld metal was observed. HFMI treatment increased the fatigue strength by 26%. The treatment did not increase the weld toe radius significantly, but resulted in a more uniform weld toe geometry along the weld. A depth of treatment in the base metal in the range of 0.15-0.19 mm and a width of treatment in the range of 2.5-3 mm, were achieved. It is concluded that the three run treatment would be a more economical option than the six run treatment providing a similar or even more favourable geometry modification.
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| 7. |
- Harati, Ebrahim, 1986-, et al.
(författare)
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Effect of high frequency mechanical impact treatment on fatigue strength of welded 1300 MPa yield strength steel
- 2016
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Ingår i: International Journal of Fatigue. - : Elsevier BV. - 0142-1123 .- 1879-3452. ; 92, s. 96-106
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Tidskriftsartikel (refereegranskat)abstract
- High frequency mechanical impact (HFMI) is a recent post weld treatment method which can be employed to increase the fatigue strength of welded components. In this paper the fatigue strength of as-welded and HFMI treated fillet welds in a 1300 MPa yield strength steel was compared. Fatigue testing was done under fully reversed, constant amplitude bending load. Finite element analysis was used to calculate the stress distribution in the weld toe region to permit evaluation of the fatigue data with the effective notch stress approach. As-welded samples showed a mean fatigue strength of 353 MPa and a characteristic fatigue strength of 306 MPa. HFMI treatment increased the mean fatigue strength by 26% and the characteristic fatigue strengths by 3%. The weld toe radii in as-welded condition were large. HFMI only increased the weld toe radii slightly but resulted in a more uniform weld toe geometry along the weld. A depth of indentation in the base metal in the range of 0.15–0.19 mm and a width of indentation in the range of 2.5–3 mm, were achieved. Maximum compressive residual stresses of about 800 MPa in the longitudinal and 250 MPa in the transverse direction were introduced by HFMI treatment, adjacent to the weld toe. The surface hardness was increased in the entire HFMI treated region. It is concluded that the increase in fatigue strength is due to the combined effects of the weld toe geometry modification, increase in surface hardness and creation of compressive residual stresses in the treated region.
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| 8. |
- Harati, Ebrahim, et al.
(författare)
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The measurement of weld toe radius using three non-destructive techniques
- 2014
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Ingår i: Proceedings of The 6<sup>th</sup> International Swedish Production Symposium 201416-18 September 2014. - 9789198097412 ; , s. 1-8
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Konferensbidrag (refereegranskat)abstract
- The three non-destructive methods Weld Impression Analysis, Laser Scanning Profiling and Structured Light Projection were employed to measure the weld toe radius of fillet welds. All three methods could be used succesfully but results are dependent on evaluation procedure. The results show that the weld toe geometry cannot be considered uniform and varies along the weld. It was also found that the measured weld toe radii do not vary significantly with minor variations ofthe surface profile orientation.
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| 9. |
- Hosseini, Vahid A., 1987-, et al.
(författare)
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Nitrogen loss and effects on microstructure in multipass TIG welding of a super duplex stainless steel
- 2016
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Ingår i: Materials & design. - : Elsevier Ltd. - 0264-1275 .- 1873-4197. ; 98, s. 88-97
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Tidskriftsartikel (refereegranskat)abstract
- Nitrogen loss is an important phenomenon in welding of super duplex stainless steels. In this study, a super duplex stainless steel was autogenously TIG-welded with one to four bead-on-plate passes with low or high heat inputs using pure argon shielding gas. The goal was to monitor nitrogen content and microstructure for each weld pass. Nitrogen content, measured by wavelength dispersive X-ray spectrometry, was after four passes reduced from 0.28 wt% in the base metal to 0.17 wt% and 0.10 wt% in low and high heat input samples, respectively. Nitrogen loss resulted in a more ferritic structure with larger grains and nitride precipitates. The ferrite grain width markedly increased with increasing number of passes and heat input. Ferrite content increased from 55% in base metal to 75% at low and 79% at high heat inputs after four passes. An increasing amount of nitrides were seen with increasing number of weld passes. An equation was suggested for calculation of the final nitrogen content of the weld metal as functions of initial nitrogen content and arc energy. Acceptable ferrite contents were seen for one or two passes. The recommendation is to use nitrogen in shielding gas and proper filler metals.
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| 10. |
- Johansson, Kristina, et al.
(författare)
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Experience from a national course in work-integrated learning : reflections about course designand learning
- 2012
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Ingår i: Conference proceedings. - Bahcecehir : Bahcecehir University. ; , s. 43-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The academic year 2011 a national course in Work Integrated Learning started as a result of cooperation between Kristianstad University and University West. The ambition was to provide opportunities for a unique exchange between teachers, tutors and others associated with WIL and also mtake its point of departure from the participants' own teaching practices. Our empirical results rests on the participants learning trajectories as well as some reflections on how the course web--‐based design has functioned as a learning facilitator. The preliminary results show that that participants altered between a surface and in depth learning process (Marton, XXXX). Structure seems to foster structure (SilÃn, XXXX). When we were given structure to a really high degree this made the students (our colleagues) demand for more structure. The pedagogical starting point, the course content and structure will be presented along with the experiences of the course assignments, group discussions, project sketches and reflection diaries. We will also invite to an interactive discussion how to further develop the course through international cooperation.
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| 11. |
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| 15. |
- Karlsson, Leif, 1952-
(författare)
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Academic quality in internships : field supervisors' account on the value of theory in practice
- 2010
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Ingår i: The Journal of Cooperative Education and Internships. - 1933-2130. ; 44:2, s. 32-42
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Tidskriftsartikel (refereegranskat)abstract
- Internship should not just introduce the students to a future professional role, but is also obliged to live up to the requirements of the Swedish Higher Education Act (SFS 1992:1434) for scientific methods and scholarly activities as well as stimulate a critical and reflective attitude. In order for internships to reach higher education standard, not only must there be students, who through their theoretical studies have developed knowledge with a scientific foundation and an ability for criticism and reflection, but a practice is also required in which this knowledge and ability may be developed and utilized. With this point of departure, the supervisors and the context of which they are a part become of special interest to study and understand. The practice within which the students in the Health Promotion and Education Programme at Kristianstad University College perform their internships is distinguished by richly varied work tasks, ill-defined professional roles and a mixture of different training and competencies (Karlsson, 2005). The supervisors lack supervisory training and only a few have an education that corresponds to the Health Promotion and Education Programme. Interviews were carried out in 2006 with 14 supervisors concerning what they perceived is required in order for them to be able to perform their work tasks, not as supervisors but in general, that is, what knowledge they perceived their work to be based upon; and how they perceived the value and relevance of the core concepts of academic quality, scientific methods and scholarly activities, critical thinking and reflection, with respect to their practical activities. The results of the study show that the supervisors perceived the basic knowledge for their work and the relevance of academic knowledge and ability for their work quite differently. The five different patterns or categories that emerged: Undeveloped, anti-academic, administrative, renewing and tension-laden all give different prerequisites for the socialisation to and learning of a ‘new profession’ by the students. The study reveals the importance of the supervisors perceiving academic thinking to be important to their activities, but also the significance of a practice where such knowledge and ability may be exploited and developed. Internship jobs give very different prerequisites for the students’ learning, which shows the significance of supervisor training and of internship placements with incentives for more development-oriented learning.
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| 16. |
- Karlsson, Leif, 1952-
(författare)
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Academic quality and internships : students’ account on the value of theory in practice
- 2011
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Ingår i: Learning Communities: International Journal of Learning in Social Contexts. - 1329-1440. ; 1:2, s. 4-20
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Tidskriftsartikel (refereegranskat)abstract
- At Kristianstad University in Sweden it has been decided that all study programmes should have work-placed training consisting of at least a period of five weeks. In different strategy documents the University states that the main reason for this is to raise employability. At the same time the importance of maintaining academic quality is stressed. Interviews were carried out in 2006 with 22 students from The Health Promotion and Education Programme concerning what they perceived as the value and relevance of the concepts that are essential to academic quality, scientific foundation/scholarly activity, critical thinking and reflection, with respect to their practical activities during their internship. The results of the study show that the students perceived the value and relevance of the concepts quite differently. The five different patterns or categories that emerged: undeveloped, separated, performance-oriented, oppositional and participatory all give different prerequisites for developing professional expertise. The study reveals the importance of the students perceiving academic thinking to be important to their practical activities during their internship, but also the significance of a greater interaction between theory and practice for maintaining a better standard of education within higher education and for developing the prerequisites for professional expertise.
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| 19. |
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| 20. |
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| 21. |
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| 22. |
- Karlsson, Leif, 1952-, et al.
(författare)
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Efficient welding of high strength steel
- 2014
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Ingår i: Proceedings of the 6th International Swedish Production Symposium 2014. - 9789198097412 ; , s. 1-8
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Konferensbidrag (refereegranskat)abstract
- Producing welds with properties matching those of the steel is a challenge at high strength levels. The present study investigated how cooling rates and dilution affects strength and toughness when welding steels with yield strengths of 777 MPa and 1193 MPa. Overmatching weld metal strength was achieved for the less strong steel and weld strengths >1000 MPa were recorded for the stronger steel. Fracture in transverse tensile testing was always located in base material or HAZ. Low dilution, rapid cooling and single pass welding contributed to higher strength. Impact toughness was higher for lower strength and low dilution.
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| 23. |
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| 24. |
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| 25. |
- Karlsson, Leif, 1952-
(författare)
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Handledning av examensarbete
- 2013
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Ingår i: Högskolepedagogisk debatt. - 2000-9216. ; :1, s. 6-16
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 26. |
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| 28. |
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| 29. |
- Karlsson, Leif, 1952-, et al.
(författare)
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Kompetensutveckling för forskarhandledare : rapport från ett samverkansprojekt mellan Läranderesurscentrum vid Högskolan Kristianstad och Centre for Educational Development (CED) vid Lunds Universitet
- 2012
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Ingår i: Högskolepedagogisk debatt. - 2000-9216. ; :2, s. 67-77
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Leif Karlsson och Anders Sonesson beskriver och diskuterar ett samverkansprojekt mellan Lunds universitet och Högskolan Kristianstad kring utbildning av forskarhandledare, som i sig innebär att: man kan utveckla den forskarhandledningsutbildning som finns; man kan stärka samarbetet mellan de två högskolorna; man kan skapa kommunikation och möten för framtida samarbete mellan olika discipliner inom det vetenskapliga fältet; och man kan utveckla kompetensen hos enskilda forskare. Projektet beskrivs på ett detaljerat sätt, och kopplas till vilka värden man menar sig kunna erhålla via en modell som den som presenteras. Det finns tre kurser med något individuella mål, det finns en progression mellan dem och helheten förväntas leda till en säkerhet inför framtida handledning.
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| 30. |
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| 31. |
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| 32. |
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| 33. |
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| 34. |
- Karlsson, Leif, 1952-, et al.
(författare)
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Orientation relationships of intragranular austenite in duplex stainless steel weld metals
- 2014
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Ingår i: Science and technology of welding and joining. - 1362-1718 .- 1743-2936. ; 19:4, s. 318-323
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Tidskriftsartikel (refereegranskat)abstract
- Formation and characteristics of fine intragranular austenite were studied for low energy input duplex stainless steel welds. Microstructures were largely ferritic with some allotriomorphic grain boundary austenite, Widmanstätten type austenite, fine intragranular austenite and nitrides. Electron backscattered diffraction analysis revealed that grain boundary austenite had a random orientation relationship (OR) with one of the adjacent ferrite grains and was close to Kurdjumov-Sachs (KS) with the other, whereas Widmanstätten austenite always showed an OR near KS. The finest intragranular austenite was mainly randomly oriented, whereas coarser austenite more often was close to KS. It is argued that the OR of intragranular austenite with the ferritic matrix is governed by a combination of composition, determining driving force for nucleation at temperature, cooling rate and the availability of nitrides acting as nucleation sites. A random OR is most likely for higher cooling rates and compositions promoting nucleation at lower temperatures. © 2014 Institute of Materials, Minerals and Mining.
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| 35. |
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| 36. |
- Karlsson, Leif, 1952-
(författare)
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Pedagogisk meritering för lärare vid Högskolan Kristianstad
- 2010
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Ingår i: Att belägga, bedöma och belöna pedagogisk skicklighet. - Uppsala : Avdelningen för universitetspedagogisk utveckling (PU), Uppsala universitet. - 9789163363160 ; , s. 103-114
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 37. |
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| 38. |
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| 39. |
- Karlsson, Leif, 1952-, et al.
(författare)
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To educate reflective and critical professionals, a continuing pedagogical challenge in the twenty first century
- 2012
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Ingår i: Conference proceedings. - Bahcecehir : Bahcecehir University. ; , s. 47-48
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Work Based/Placed Learning should not just introduce the students to a future professional role, but, in doing so, should be structured to retain the core elements of Higher Education learning through stimulating a critical and reflective attitude as well as aiming to fully develop the diversity of skills needed to encode, decode, ponder, interpret, evaluate and reach decisions about knowledge and practice. Learning at both the university and during the work--‐placed period might require students to adjust to routines and rules, but should also require them to exercise critical thinking that challenges status quo on the basis of a scientific approach to learning. Such a point of departure means that fundamental higher education pedagogical issues are put in focus. The Workshop will discuss different ways to address these pedagogical challenges drawing on the experience from the participants own pedagogical practice in or/and out of campus.
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| 40. |
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| 42. |
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| 43. |
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| 44. |
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| 45. |
- Karlsson, Leif, 1952-, et al.
(författare)
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Work integrated learning in collaboration. Paper presented at the WACE nternational Conference on Work Integrated Learning, Hong Kong, February
- 2010
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Konferensbidrag (refereegranskat)abstract
- In Sweden a national network for cooperation and collaboration on research and pedagogical development related to Work Integrated Learning in higher education has recently been formed. Higher education is based on key concepts such as a scientific way to look at knowledge and knowledge production, critical thinking and reflection. To achieve academic credibility WIL needs to develop both a strong link to research but also to scholarship of teaching and learning. To do this in collaboration and with several universities involved is doubtless a way forward. As a first step in such collaboration a course focusing on different aspects of WIL has been developed. The course will have a national spreading and teachers, tutors and other interested parties from universities in Sweden are invited to participate. Key areas in the course are the theory - practice nexus and its importance for the learning process, coaching and tutor rationality, exam problems and the relationship between the university, the work place and the student. The starting point for the course is experiences from the participants' own teaching practices. The benefits of a national course are several: Through a national collaboration we can invite researchers and teachers with a high competence in different field related to WIL to lecture in the course The course provides opportunities for a unique exchange of experience among teachers, trainers, tutors and other interested parties The course is designed to encourage cooperation on research and educational development projects both within the course framework and after its closure. The course is mainly net-based but with the opportunity to meet in appropriate geographic formations. The participants are examined trough a project based on there own pedagogical theory and practice and will be reviewed by the other participants who act as critical friends. For the project to get a wider distribution they will be presented in the coming year s national WIL conference. Accepted contributions imply that the participant pass the course. The session will discuss the importance of the research teaching nexus regarding WIL. The point of departure is the importance of national network building for cooperation and collaboration on research and pedagogical development and the importance of starting the process in teachers, trainers and tutors own pedagogical practice. The course presented is one way to bring these different issues together.
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| 46. |
- Lahti, K., et al.
(författare)
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Productivity Aspects in Submerged Arc Welding of Thick High-Strength Steels
- 2015
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Ingår i: Proceedings of IIW International Conference, High-Strength Materials. - Helsingfors. ; , s. 1-6-
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Konferensbidrag (refereegranskat)abstract
- A series of welding tests were made on 35 mm thick F500W high strength steel. This specific steel grade is developed for use in arctic conditions, especially in shipbuilding, and it has excellent impact toughness at temperatures down to -60°C. Submerged arc welding tests were performed using solid and flux-cored welding wire keeping the heat-input at levels typically recommended for thermo mechanically processed highstrengthsteels. Process improvement trials were even made using electrode extension (EE) allowing for higher melt-on rates without any increase in the heat input.However, as the chemical composition of F500W allows for higher heat input without risk for excessive grain growth, tests at higher heat inputs were also made as reference for additional ways to increase productivity. Three fundamental means for improving productivity were analyzed in this study: 1) use of solid or flux-cored wire, 2) effect of groove preparation, and 3) use ofelectrode extension. These all can be introduced without changes in heat input, and hence implementation to existing production systems is easy, economical and quick. Highest increase in productivity is gained by using electrode extension with optimized groove geometry. In the studied thickness of 35 mm, the number of runs was decrease by 60 % from 22 to 9 without increase in the heat input and with approved mechanical properties for this specific steel. Based on the outcome of this study, submerged arc welding can successfully be used for joining of this high strength steel with approved mechanical properties and high productivity.
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| 47. |
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| 48. |
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| 49. |
- Mráz, Lubos, et al.
(författare)
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Residual stress distribution measurement by neutron diffraction of the single pass fillet steel welds
- 2014
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Ingår i: 52nd International Scientific Conference on Experimental Stress Analysis (EAN 2014). - : Czech Society for Mechanics ( CSM ). - 9781632668226
-
Konferensbidrag (refereegranskat)abstract
- In this contribution the results of residual strain/stress measurements performed on several single pass fillet steel welds which were carried out at different welding conditions, namely, with different filler materials are presented.
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| 50. |
- Mraz, Lubos, et al.
(författare)
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Residual stress distributions at high strength steel welds prepared by low transformation temperature (LTT) and conventional welding consumables
- 2014
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Ingår i: Materials Science Forum. - 0255-5476 .- 1662-9752. ; 777, s. 40-45
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Tidskriftsartikel (refereegranskat)abstract
- Residual stress distributions in fillet welds in 8 mm 900 MPa steel have been mapped perpendicular and parallel to the weld line and also through the thickness in the vicinity of weld toe position. Measurements were carried out on four welds when two of them were performed with conventional and two with the so called LTT (low transformation temperature) filler materials. Both neutron and X-ray diffractions were used for determination of the residual stress distribution. Fatigue properties have also been evaluated for all test welds. Neutron diffraction measurements showed that the stress profiles perpendicular to the weld toe qualitatively did not depend on filler material type although the absolute stress levels differed. Trends were similar for positions 2, 4 and 6 millimetres below the surface for all three stress components; σx (direction perpendicular to the weld), σy (parallel to the weld) and σz (through the thickness). X-ray diffraction showed difference in residual stress level at the weld toe. Lower residual stress levels have been identified for LTT filler material when compared to the conventional consumable compositions. The effect of residual stress is discussed in relation to fatigue properties of all four welds. Remarkable higher fatigue strength has been measured for welds prepared by the LTT filler materials. © (2014) Trans Tech Publications, Switzerland.
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