Wood welding is a wood assembling method without the use of adhesive. This process, received in 2005 the Schweigohfer European award, category innovation in the wood industry. Since that time there were continuous researches on this process. Soudabois, first ANR project (2007-2010), highlighted the weldable character of every wood species, identified operational techniques, optimized the welding cycles and improved understand and knowledge about the chemical and physical wood welding process. Until 2010 the main weakness of wood welding technology was the bad strength to moisture of the welded joint. Research conducted by the LERMAB and INRA highlighted that some wood species had welded joint resistant to moisture. This discovery initiated a new patented welding process with a moisture resistant seal. This new process involves treating the surface before welding with a biobased additive (ex: rosin). This treatment creates a protective shell around the welded joint. So far, tests have been performed on a limited number of species with the implementation of a single additive. An additional lack of knowledge, beyond the strength to moisture, is the mechanical wood welding evolution and durability in outdoor conditions. This is a constant request from companies interested in this new technology. The heterogeneous nature of wood material suggests that the optimum welding cycle can be different even with parts extracted in the same wood board. It is important to analyze the sensitivity of some parameters related to the heterogeneity in order to industrialize wood welding (density, tree ring widths, sapwood or heartwood, etc.). It is necessary to look further real-time automation of the welding cycle with a feedback according to measured parameters. First ANR project Soudabois had initiated the possibility of a real time control of the welding gas emitted during welding. The project SOUDABOIS II is planned for 36 months, and it involves two laboratories, a technical center and a company. The project is based on two efficient wood welding processes (rotational and linear friction) and its purposes are: • Study, characterization, understanding and optimization of moisture resistant welding applied to several wood species: natural or treated wood for external uses, natural water repellent wood, mixed welding; • Study, characterization, understanding and optimizing the mechanical durability of the wood welding; • Study impacts of wood variability on welding performance and possibility of developing real-time automation servo welding. The knowledge and skills developed by laboratories LERMAB and IS2M on these materials and processes are the scientific basements of the project. CRITT Bois, resource center for wood industries, will coordinate the project and the industrial company BURGER will orientate and keep the focus on potential economic applications.