Dissimilar welding between conventional and high strength low alloy naval steels with the use of robotic metal cored arc welding
| Autor: | Carlos Capdevila, Marios Kazasidis, Rocco Lupoi, D. I. Pantelis, Francisca García Caballero, Elias P Bilalis, Jonathan Cassidy |
|---|---|
| Přispěvatelé: | Enterprise Ireland, SchuF |
| Rok vydání: | 2021 |
| Předmět: |
0209 industrial biotechnology
Materials science Bainite Alloy 02 engineering and technology Welding engineering.material Industrial and Manufacturing Engineering law.invention 020901 industrial engineering & automation law Ultimate tensile strength Naval grades Tensile testing Austenite High-strength low-alloy steel MCAW Mechanical Engineering Metallurgy Computer Science Applications HSLA steel Control and Systems Engineering engineering Arc welding Pearlite Software |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | The increasing trend of high strength low alloy steel application in the shipbuilding industry dictates the necessity for an investigation of their welds with conventional high strength steels. In this study, conventional and high strength low alloy naval steel plates 12 mm thick, were joined together in a butt joint configuration, using the metal cored arc welding technique and low heat input (1.0 kJ/mm). The weld was examined in terms of microhardness, microstructure, and tensile performance. The effect of multiple thermal cycles on the formation of primary and secondary microstructures was also discussed. The results revealed a smooth distribution of the microhardness across the different weld regions. Inside the heat affected zones (HAZs) and the weld metal various constituents were revealed, with ferrite in various forms (lath-like, acicular, semi-equiaxed, polygonal) appearing as the predominant phase, alongside martensite and austenite grains, and pearlite (lamellar and degenerated). The tensile testing indicated the base metal of the conventional high strength steel to be the weakest link of the weld, which was mainly attributed to its ferritic-pearlitic microstructure and the coarse grain size. The overall tensile performance of the weld remained at high levels, with a simultaneous reduction in the elongation after fracture in comparison to the base metals. The research was supported by Enterprise Ireland (EI) and SchuF Valve Technology GmbH (IP2018 0730) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|