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International Conference on Design and Manufacturing of Arctic Structures (DMAS-2019)

2.10.2019, hall 1318, LUT University, Lappeenranta, Finland

The conference provided a forum for networking and knowledge exchange among scientists, researchers, and industry related to manufacturing, welding and joining of Arctic structures, including renewable energy structures. The conference was organized in a framework of ENI CBC EFREA project, which is financed by the European Union, the Russian Federation and the Republic of Finland.

DMAS Conference participants

There were 51 attendees in the DMAS conference on Wednesday 2.10.2019. Approximately half of the attendees were from Finnish companies and a half from LUT University and Russian project partners. The conference had good atmosphere and open discussion on the different main topics at the conference. The main topics were:

  1. Welding of HSS and UHSS for low-temperature condition

  2. Robotic welding and other technology

  3. Wind energy applications for arctic conditions

The presenters were well prepared and gave excellent 15 minutes presentations. After each presentation, the audience had time to ask questions on the topic. There was also the poster session organized at the conference. In every break and after the conference session, authors were displaying their posters to the audience in the lobby.

The conference was opened by Prof. Jari Hämäläinen, LUT University vice-rector of research. In his opening words he gave a brief introduction to LUT University research activities, he underlined the importance of the cross-border cooperation, Finnish-Russian collaboration and welcomed participants to the event and to LUT University.

The first session was titled “Welding of HSS and UHSS for low temperature conditions,” and was chaired by Associate Prof. Paul Kah (LUT University), Prof. Victor Karkhin (Peter the Great St.Petersburg Polytechnic University), Dr. Eric Mvola Belinga (LUT University). The session consisted of presentations given by Dr. Pavel Layus (LUT University) on the topic “High strength steel welding challenges for Arctic wind turbines.” Dr. Layus gave a presentation on different HSS and UHSS and its applications in the wind turbines as well as welding requirements for the different HSS/UHSS grades including the case study of dissimilar welding. The next presentation was given by Prof. Sergey Parshin from Peter the Great St.Petersburg Polytechnic University. Prof. Parshin’s topic was “Composite wire with nano dispersed particles of hexaboride and trifluoride lanthanum for arc welding of high-strength and cold-resistant steels.” He talked about the benefits of composite wire compared to the standard wire. The main advantage comes from the increased stability of the welding process as well as welding quality. He explained that the quality advantage comes from reduced porosity and impurity. Additionally, he mentioned that the depth of penetration and melting of the wire is improved by increased plasma conductivity due to lanthanum and fluorine. After that Dr. Ryabov (CRISM Prometey) gave a presentation titled “Peculiarities of steel requirements for wind power plants.” The main topic was the comparison of different standards used in steel requirements. An author underlined the difficulties in defining the material and structures of wind power in Arctic applications. Dr. Ryabov pointed out that many UHSS are not classified according to the standards for wind structures. After that Prof. Victor Karkhin (Peter the Great St.Petersburg Polytechnic University) gave a presentation titled “Effect of Microstructural Inhomogeneity on Hydrogen Diffusion from the Weld Metal to the Base Metal,” where he explained the importance of hydrogen in the cracking appearance. He presented the method to define the hydrogen level in the HAZ. He provided extensive information on hydrogen flow and its importance in welding applications with different weld filler materials and with different crystal structures. The next presentation was given by Dr. Eric Mvola Belinga (LUT University) on the topic “Dissimilar S355 and S690 Steels T-Joint Characterization.” Dr. Mvola Belinga talked on the weldability of steels and HSS and its difficulties. He gave extended review on the challenges of dissimilar joint welding and the joints characteristics. He presented a case study that characterizes the microstructure of a dissimilar steel weld joint of S355 to S690 for different filler wire and welding procedures. In the study, a robotic GMAW process was used for a dissimilar weld of steel S355 and S690 in a T-joint with an increasing gap. After that, the next presentation was held by Antti Ahola (LUT University) on the topic “Fatigue strength assessment of welded components in the marine environment – a case study on a non-load carrying fillet-welded joint.” He explained different approaches to evaluate fatigue life (HS, ENS, LEFM). He also presented an analysis of the case study based on these methods and comparison with the different cases and initial crack sizes. The last presentation in the session was given by Dr. Tuomas Skriko (LUT University). His topic was “Static strength of as-welded and post-weld treated ultra-high-strength steel filled weld joints in the room and arctic temperature,” where he presented a case study with different post-weld treatment (PWT) methods being compared and evaluated. The experimental tests were carried out in a tensile test form to evaluate the effect on PWT to static loads to the structure.

After the first session, participants were invited for lunch to LUT cafeteria and also to attend the poster session. The poster session featured the following posters:

  1. Assessment and Consideration of Climatic Factors in the Creation of Arctic Wind Power Plants. Presented by junior researcher Inna Bogun from Peter the Great St.Petersburg Polytechnic University.

  2. Features of the structure and properties of cold-resistant steel grades for wind power plants. Prepared by senior engineer Ekaterina Yashina from CRISM Prometey.

  3. Prediction of structural stability and mechanical properties of cold-resistant steel grades. Prepared by Prof. Elena Khlusova from CRISM Prometey.

  4. Study of hyperbaric welding of X70 high strength steel pipes using flux-cored wire. Prepared by Docent Irina Ivanova from Peter the Great St.Petersburg Polytechnic University.

  5. Underwater wet welding and cutting of X70 high strength steel using flux-cored wire. Prepared by Dr. Gennady Levchenko from Peter the Great St.Petersburg Polytechnic University.

  6. A knowledge-based high-strength steels welding distortion estimation method for a multi-robot welding off-line programming and simulation software. Prepared by junior researcher Hannu Lund from LUT University.

Poster session

After lunch, the second session titled “Robotic welding and other technology” started. The session was chaired by Docent Heidi Piili (LUT University), Dr. Tuomas Skriko (LUT University). The session was opened by junior researcher Sakari Penttilä with the presentation titled “Effect of Welding Torch Position Error to Weld Quality and Quality Verification by Using Laser Triangulation Measurement,” where he talked on method for evaluating and defining the effect of different welding parameters to the welding quality. The study was made to evaluate the requirement for automatic welding and jigless welding applications. After that, junior researcher Markus Korpela (LUT University) gave a presentation on “Materials Used by the Finnish Metal and Mechanical Engineering Industry from the Perspective of Metal Additive Manufacturing.” He mentioned most used materials in the industry and compared applied materials in additive manufacturing. He presented the survey to define the restrictions of the additive manufacturing based on industrial companies’ cases. The next was a presentation “Application Possibilities of the Polymer Composite Material Based on Ultra-High Molecular Polyethylene for the Anti-Icing Coatings of Wind Generators Structural Elements” given by Dr. Tatiana Bobkova (CRISM Prometey). She explained the wind turbine anti-icing techniques. She presented the coating processes of developing efficient anti-icing surface for wind turbine blades in low temperatures. Junior researcher Sakari Penttilä gave a presentation on a topic “A knowledge-based high-strength steels welding distortion estimation method for a multirobot welding off-line programming and simulation software.” He pointed out a method for measuring the pre-weld and afterweld conditions for jigless welding application. He provided insight to the creation of base for knowledge bank for simulation software to automatize and simulate distortions in simulation model to reduce manual programming time. After the session has ended, participants proceeded to a coffee break.

The last session was titled “Wind energy applications for Arctic conditions” and chaired by Associate Prof. Teemu Turunen-Saaresti (LUT University), Prof. Victor Elistratov (Peter the Great St.Petersburg Polytechnic University), Dr. Pavel Layus (LUT University). The session was opened by a presentation from Prof. Alexander Bolshev (Peter the Great St.Petersburg Polytechnic University), who gave a speech on the topic “Mathematical Modelling of External Loads on Ice-Resistant Arctic Wind Power Plants.” He mentioned the safety and reliability procedures of wind turbine plants. He has explanations on the behavior analysis of the complete wind turbine projects and its reliability. He also demonstrated how the estimations of the ice loads and modelling in marine power plants can be conducted. The next presentation was given by Dr. Aki Grönman (LUT University) on the topic “Effects of Reynolds Number and Stator-Rotor Interaction on Vane-To-Vane Flow Development in Vaned Savonius Turbines.” Dr. Grönman explained the radial blade method for wind turbines. He mentioned that the turbines provided more silent power than standard wind power plants. The presented new rotor structure simulated based on the wind flow and blades are optimized based on the analysis. Dr. Grönman pointed out that the “Savonius” turbine is in test phase to evaluate its suitability and efficiency. The session was conducted by a presentation of Prof. Victor Elistratov (Peter the Great St.Petersburg Polytechnic University) on the topic “Justification of Requirements for Adaptation Measures, Technologies and Materials by Designing Arctic Wind Turbines.” Prof. Elistratov presented a study to explore the suitable areas for wind power plants, as well as problem areas in low temperatures difficult climate, delivery and logistics. He pointed out that diesel generators are used to generate power in the Arctic area and his plans to increase the wind power plants locally to reduce fossil fuels. Also, he explained that the delivery of diesel fuel is very expensive, so wind power might be more cost efficient. He concluded providing a method to categorize the turbine in different sections for easier on-site assembly, maintenance and anti-icing treatments.

After the session ended, the conference organizer Associate Prof. Paul Kah made a conclusion remark and thanked the audience, chairs, and presenters for the excellent work.

From right to left: Associate Prof. Paul Kah (LUT Univerity), Associate Prof. Teemu Turunen-Saaresti (LUT University) and Prof. Victor Elistratov (Peter the Great St.Petersburg Polytechnic University).

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