2025

• Siddarthan, Yugesh Raajha Maheswari; Ringen, Geir; Grong, Øystein; Welo, Torgeir. (2025) The effect of weld line orientation and mechanical integrity of friction-stir welded tailored blanks made from primary and recycled AA6082 extrusions.
  Annet
• Furu, Trond; Ellingsen, Kjerstin; Ringen, Geir. (2025) Green aluminium products. Aluminium
  Fagartikkel

2024

• Ha, Taekwang; Welo, Torgeir; Ringen, Geir; Wang, Jyhwen. (2024) Formability prediction of perforated sheet metal by representative volume element and homogenized sheet models. Manufacturing Letters
  Vitenskapelig artikkel
• Ha, Taekwang; Welo, Torgeir; Ringen, Geir; Wang, Jyhwen. (2024) Smart Control of Springback in Stretch Bending of a Rectangular Tube by an Artificial Neural Network. Journal of Manufacturing Science and Engineering
  Vitenskapelig artikkel
• Øien, Christian Dalheim; Ringen, Geir. (2024) Data-driven through-process modelling of aluminum extrusion: Predicting mechanical properties. Manufacturing Letters
  Vitenskapelig artikkel
• Silva, Ana Lyvia Tabosa Da; Assuad, Carla Susana Agudelo; Ringen, Geir. (2024) A data management framework for life cycle simulation in extruded Aluminium products production. Procedia CIRP
  Vitenskapelig artikkel
• Sarkar, Aritra; Aktunali, Mehmet; Arbo, Siri Marthe; Holmestad, Jon; Viespoli, Luigi Mario; Nyhus, Bård. (2024) A study on the influence of impurity content on fatigue endurance in a 6082 Al-alloy. International Journal of Fatigue
  Vitenskapelig artikkel

2023

• Sarkar, Aritra; Razavi, Nima; Ringen, Geir; Welo, Torgeir. (2023) Assessing the fatigue behaviour of recycled Al-alloys: A critical review. Materialia
  Vitenskapelig artikkel
• Ringen, Geir. (2023) Produktutvikling.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Ringen, Geir. (2023) Case innen verdikjedebetraktninger i Industri 4.0.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Akram, Md Ali; Holthe, Ragnar; Ringen, Geir. (2023) Rapid Sorting of Post-consumer Scrap Aluminium Alloys Based on Laser-Induced Breakdown Spectroscopy (LIBS). IFIP Advances in Information and Communication Technology
  Vitenskapelig artikkel
• Assuad, Carla Susana A; Øien, Christian Dalheim; Ringen, Geir. (2023) Circularity assessment of the effects of customer preferences towards sustainable development on producers for aluminum-based products in Norway. Procedia CIRP
  Vitenskapelig artikkel
• Sariyarlioglu, Eren Can; Negozio, Marco; Ma, Jun; Welo, Torgeir; Ringen, Geir. (2023) Effect of Die Design on Charge Welds in Aluminium Extrusion. Springer Springer
  Vitenskapelig antologi/Konferanseserie
• Ha, Taekwang; Welo, Torgeir; Ringen, Geir; Wang, Jyhwen. (2023) On Kinematics in Sequential Three-Dimensional Stretch Bending: Analytical Springback Model. Journal of Manufacturing Science and Engineering
  Vitenskapelig artikkel

2022

• Ringen, Geir; Welo, Torgeir; Breivik, Sissel Marie. (2022) Rapid Manufacturing of Die-casting Tools - a Case Study. Procedia CIRP
  Vitenskapelig artikkel
• Shafqat, Ali; Oehmen, Josef; Welo, Torgeir; Ringen, Geir. (2022) The role of risk mitigation actions in engineering projects: An empirical investigation. Systems Engineering
  Vitenskapelig artikkel
• Ringen, Geir. (2022) Value Chain Data Integrity and Quality - A Case Study. INCOSE International Symposium
  Vitenskapelig artikkel
• Fragapane, Giuseppe; Schulte, Kjersti Øverbø; Eleftheriadis, Ragnhild; Reke, Eivind; Ringen, Geir. (2022) A Cross-disciplinary, cross-organizational approach to sustainable design and product innovation in the aluminum industry. Procedia CIRP
  Vitenskapelig artikkel
• Ma, Jun; Tronvoll, Sigmund Arntsønn; Welo, Torgeir; Ringen, Geir. (2022) On Dimensional Control in Rotary Stretch Bending of Aluminum Profiles: Loading-Path Effects. Manufacturing Letters
  Vitenskapelig artikkel
• Ringen, Geir; Landsem, Kristin Lorentzen; Holtskog, Halvor. (2022) Design for Excellence to Explore Complex Product Service Systems: A Case Study. Procedia CIRP
  Vitenskapelig artikkel
• Elkjær, Aksel Sean; Ringen, Geir; Bjørge, Ruben; Hagen, Catalina Hoem Musinoi; Lædre, Sigrid; Magnusson, Niklas. (2022) Reliability of Bolted Aluminum Busbars for Battery Systems: Effect of Nickel Coating and Corrosive Environment. IEEE Transactions on Transportation Electrification
  Vitenskapelig artikkel
• Mitcheltree, Christina Marie; Holtskog, Halvor; Ringen, Geir. (2022) Towards a shared vision in innovation projects: Understanding actor involvement as a preventative approach against defensive routines for innovation capability. Procedia CIRP
  Vitenskapelig artikkel
• Kovalevskaya, Daria; Pedersen, Ann-Charlott; Holmen, Elsebeth; Kaloudis, Aris; Ringen, Geir. (2022) Triads in Lean Management: Analyzing Buyer–Supplier-Supplier and Buyer–Supplier-Supplier’s Supplier Relationships for Zero-Defect Manufacturing. Journal of the Knowledge Economy
  Vitenskapelig artikkel
• Elkjær, Aksel Sean; Sørhaug, Jørgen A; Ringen, Geir; Bjørge, Ruben; Grong, Øystein. (2022) Electrical and thermal stability of Al-Cu welds: Performance benchmarking of the hybrid metal extrusion and bonding process. Journal of Manufacturing Processes
  Vitenskapelig artikkel

2021

• Ringen, Geir; Welo, Torgeir. (2021) Material substitution innovation - trajectories towards circular economy.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Hansen, Irina-Emily; Mork, Ola Jon; Welo, Torgeir; Ringen, Geir. (2021) Bridging the ‘Valley of Death’: Can Agile Principles Be Applied in Industry-Academia Research and Innovation Projects?. Journal of the Knowledge Economy
  Vitenskapelig artikkel
• Ha, Taekwang; Welo, Torgeir; Ringen, Geir; Wang, Jyhwen. (2021) A strategy for on-machine springback measurement in rotary draw bending using digital image-based laser tracking. The International Journal of Advanced Manufacturing Technology
  Vitenskapelig artikkel

2020

• Ringen, Geir; Welo, Torgeir. (2020) Material substitution innovation - trajectories towards circular economy.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Welo, Torgeir; Ringen, Geir; Ma, Jun. (2020) An overview and evaluation of alternative forming processes for complex aluminium products. Procedia Manufacturing
  Vitenskapelig artikkel
• Ringen, Geir; Pålsrud, Frode Gulbrandsen; Lodgaard, Eirin Anita. (2020) Interorganizational Learning in Manufacturing Networks.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Ha, Taekwang; Murudkar, Rahul; Hartwig, Karl; Welo, Torgeir; Ringen, Geir; Wang, Jyhwen. (2020) A feasibility study of continuous grain refinement of sheet metal. Procedia Manufacturing
  Vitenskapelig artikkel
• Welo, Torgeir; Ringen, Geir; Rossi, Monica. (2020) Investigating Maturity of Lean Culture in Product Development Teams. Lecture Notes in Networks and Systems
  Vitenskapelig artikkel
• Holtskog, Halvor; Ringen, Geir. (2020) The insufficiency of lean tradition - Lean meets kodak moments. Procedia CIRP
  Vitenskapelig artikkel
• Welo, Torgeir; Ma, Jun; Blindheim, Jørgen; Ha, Taekwang; Ringen, Geir. (2020) Flexible 3D Stretch Bending of Aluminium Alloy Profiles: An Experimental and Numerical Study. Procedia Manufacturing
  Vitenskapelig artikkel
• Ha, Taekwang; Ma, Jun; Blindheim, Jørgen; Welo, Torgeir; Ringen, Geir; Wang, Jyhwen. (2020) In-line Springback Measurement for Tube Bending Using a Laser System. Procedia Manufacturing
  Vitenskapelig artikkel
• Ma, Jun; Ha, Taekwang; Blindheim, Jørgen; Welo, Torgeir; Ringen, Geir; Li, Heng. (2020) Exploring the Influence of Pre/Post-Aging on Springback in Al-Mg-Si Alloy Tube Bending. Procedia Manufacturing
  Vitenskapelig artikkel
• Ringen, Geir; Holtskog, Halvor; Welo, Torgeir. (2020) A Novel Value Driven Co-creation Framework.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel

2019

• Mitcheltree, Christina Marie; Holtskog, Halvor; Ringen, Geir. (2019) Studying design thinking as a forthcoming source to innovation speed. Proceedings of the International Conference on Engineering Design
  Vitenskapelig artikkel
• Welo, Torgeir; Lycke, Atle; Ringen, Geir. (2019) Investigating the use of set-based concurrent engineering in product manufacturing companies. Procedia CIRP
  Vitenskapelig artikkel
• Beste, Carina; Welo, Torgeir; Ringen, Geir. (2019) Newness and Outcomes in Commodity-Driven New-Product Development Projects: A Survey in the Norwegian Manufacturing Industry. Procedia CIRP
  Vitenskapelig artikkel
• Barua, Deep; Welo, Torgeir; Ringen, Geir; Wang, Jyhwen. (2019) An experimental study on interference friction welding process. Procedia Manufacturing
  Vitenskapelig artikkel
• Schjøtt-Pedersen, Nikolai; Welo, Torgeir; Ringen, Geir; Raknes, Christian Arne. (2019) Using set-based design for developing a 3D metal forming process. Procedia CIRP
  Vitenskapelig artikkel

2018

• Holtskog, Halvor; Ringen, Geir. (2018) Social mechanisms of performance systems. European Journal of Workplace Innovation
  Vitenskapelig artikkel
• Holtskog, Halvor; Lied, Lars Harald; Ringen, Geir. (2018) Coping with technology: A future of robots?.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Ringen, Geir; Welo, Torgeir. (2018) The product development learning process and its relation to performance indicators. Procedia Manufacturing
  Vitenskapelig artikkel
• Holtskog, Halvor; Carayannis, Elias G.; Kaloudis, Aris; Ringen, Geir. (2018) Learning Factories: The Nordic Model of Manufacturing. Palgrave Macmillan Palgrave Macmillan
  Vitenskapelig monografi
• Welo, Torgeir; Ringen, Geir. (2018) Investigating Organizational Knowledge Transformation Capabilities in Integrated Manufacturing and Product Development Companies. Procedia CIRP
  Vitenskapelig artikkel

2017

• Welo, Torgeir; Ringen, Geir. (2017) Lean assessment and transformation strategies in product development: A longitudinal study. Proceedings of the International Conference on Engineering Design
  Vitenskapelig artikkel
• Ringen, Geir; Schulte, Kjersti Øverbø. (2017) Continuous vs step change production process improvement as enablers for product redesign and new market opportunities. IFIP Advances in Information and Communication Technology
  Vitenskapelig artikkel

2016

• Holtskog, Halvor; Martinsen, Kristian; Skogsrød, Torbjørn; Ringen, Geir. (2016) The Pivoting Problem of Lean. Procedia CIRP
  Vitenskapelig oversiktsartikkel/review
• Welo, Torgeir; Ringen, Geir. (2016) Customer-focused development practices in Systems Engineering companies A case study across industry sectors.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Ringen, Geir; Welo, Torgeir; Østerbø, Emma. (2016) Learning and Knowledge Systems in Product Development Environments. Procedia CIRP
  Vitenskapelig artikkel
• Lodgaard, Eirin Anita; Ringen, Geir; Larsson, Catrine Eleonor. (2016) Viewing the engineering change process from a lean product development and a business perspective. Journal of the Knowledge Economy
  Vitenskapelig artikkel
• Welo, Torgeir; Ringen, Geir. (2016) Beyond Waste Elimination: Assessing Lean Practices in Product Development. Procedia CIRP
  Vitenskapelig artikkel

2015

• Ringen, Geir; Welo, Torgeir. (2015) Knowledge Based Development Practices in Systems Engineering Companies: A Comparative Study.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Welo, Torgeir; Ringen, Geir. (2015) Investigating lean development practices in SE companies: A comparative study between sectors. Procedia Computer Science
  Vitenskapelig artikkel

2014

• Ringen, Geir; Aschehoug, Silje Helene; Holtskog, Halvor; Ingvaldsen, Jonas A. (2014) Integrating Quality and Lean into a Holistic Production System. Procedia CIRP
  Vitenskapelig artikkel
• Aschehoug, Silje Helene; Schulte, Kjersti Øverbø; Ringen, Geir. (2014) Early Innovation Leadership.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Ingvaldsen, Jonas A; Netland, Torbjørn H.; Ringen, Geir. (2014) Step changes in mature production systems. NTNU, IØT NTNU, IØT
  Rapport
• Ringen, Geir; Welo, Torgeir. (2014) Stabilizing new-product development processes – a prerequisite or a barrier to satisfy customer wants and needs?. Procedia CIRP
  Vitenskapelig artikkel
• Ingvaldsen, Jonas A; Ringen, Geir. (2014) Første verktøyskuff: Standardisering.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Ringen, Geir; Rolfsen, Monica. (2014) Lean blir norsk.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Ingvaldsen, Jonas A; Ringen, Geir. (2014) Tredje verktøyskuff: Visualisering.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Ringen, Geir; Rolfsen, Monica. (2014) Lean kommune.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Ringen, Geir; Lodgaard, Eirin Anita. (2014) Fjerde verktøyskuff: Kontinuerlig forbedring.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Ingvaldsen, Jonas A; Ringen, Geir; Rolfsen, Monica. (2014) Lean på global vandring.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel

2013

• Ringen, Geir; Holtskog, Halvor. (2013) How enablers for lean product development motivate engineers. International journal of computer integrated manufacturing (Print)
  Vitenskapelig artikkel
• Welo, Torgeir; Aschehoug, Silje Helene; Ringen, Geir. (2013) Assessing the Relationship between New Product Development Practices and Performance in the Norwegian Manufacturing Industry.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Holtskog, Halvor; Ringen, Geir. (2013) Opportunities in the Wake of Crisis. Procedia CIRP
  Vitenskapelig artikkel
• Ingvaldsen, Jonas A; Holtskog, Halvor; Ringen, Geir. (2013) Unlocking work standards through systematic work observation: implications for team supervision. Team Performance Management
  Vitenskapelig artikkel

2012

• Ringen, Geir; Henriksen, Ottar; Myklebust, Odd. (2012) Raufoss Technology Globalization Straegies and Implementation.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Aschehoug, Silje Helene; Boks, Casper; Ringen, Geir; Aasland, Knut Einar. (2012) Investigating the importance of sustainability information in Product Development and Design.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• Ringen, Geir; Holtskog, Halvor; Martinsen, Kristian. (2012) User Friendly Framework for Measuring Product and Process Novelty in the Early Stages of Product Development. Procedia CIRP
  Vitenskapelig artikkel

2009

• Fleten, Stein-Erik; Ringen, Geir. (2009) New renewable electricity capacity under uncertainty: The potential in Norway. Journal of Energy Markets
  Vitenskapelig artikkel

2008

• Ringen, Geir; Sørby, Knut; Martinsen, Kristian. (2008) High-pressure coolant chip control in boring of aluminium alloys.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel

2006

• Fleten, Stein-Erik; Ringen, Geir. (2006) New Renewable Electricity Capacity under Uncertainty: The Potential in Norway.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel