Improvements of hybrid laser arc welding for shipbuilding T-joints with 2F position of 8 mm thick steel
| Autor: | Cristina Churiaque, Andrey Gumenyuk, Ömer Üstündağ, M. Porrua-Lara, Michael Rethmeier, José María Sánchez-Amaya |
|---|---|
| Přispěvatelé: | Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, Publica |
| Rok vydání: | 2021 |
| Předmět: |
0209 industrial biotechnology
Materials science Process parameters Mechanical engineering 02 engineering and technology Welding Edge (geometry) 021001 nanoscience & nanotechnology Naval steel Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention T-joints 020901 industrial engineering & automation law Residual stress Shipbuilding industry Head (vessel) Hybrid laser arc welding Laser power scaling Arc welding Disk laser Electrical and Electronic Engineering 0210 nano-technology Fillet (mechanics) |
| Zdroj: | Optics & Laser Technology 143 (2021) 107284 RODIN. Repositorio de Objetos de Docencia e Investigación de la Universidad de Cádiz instname RODIN: Repositorio de Objetos de Docencia e Investigación de la Universidad de Cádiz Universidad de Cádiz |
| Popis: | One of the main concerns in the early stages of manufacturing flat units of shipbuilding is to ensure the quality of the joints throughout the structure. The flat units are constituted by butt welded flat plates, on which longitudinal T-welded reinforcements are placed to rigidize the structure. Among the different welding technologies, Hybrid Laser Arc Welding (HLAW) is becoming a mature process, profitable and highly productive. In addition, more innovative welding equipment are being developed nowadays, offering greater work flexibility, and raising expectations of achieving better quality, and economic viability. Another key point of HLAW to keep in mind is that structural distortions are reduced, resulting in decreasing the cost and time of straightening work. In the present contribution, the influence of HLAW parameters on the quality of fillet joints of naval steel has been analysed. Experimental HLAW tests were performed with a high power disk laser to join EH36 naval steel plates, with a T configuration. The influence of different processing parameters has been analysed, as the laser power, welding speed, wire feed rate and the configuration of the HLAW processes (including head angle and laser/arc leading process). In addition, FEM simulations were carried out in order to estimate residual stresses and distortion of welded part. The distortion values provided by FEM presented excellent agreement with the measured experimental results. To evaluate the welds, non destructive tests including X-ray tests, metallographic analysis of cross sections, and microhardness mapping tests were performed. Full penetration 8 mm T welds were obtained for the first time at an industrially applicable 2F position with a reasonable HLAW head angle, in one single step without sealing root, and using zero gap square groove edge preparation. The present contribution presents welding rates up to 2.2 m/min for 2F T-joints of this steel thickness, a much higher processing velocity than previously reported for industrial applications. |
| Databáze: | OpenAIRE |
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