Viňáš Ján, Brezinová Janette, Sailer Henrich, Brezina Jakub, Sahul Miroslav, Maruschak Pavlo, Prentkovskis Olegas
Department of Technology, Materials and Computer Aided Production, Faculty of Mechanical Engineering, Technical University of Košice, 040 01 Košice, Slovakia.
Department of Welding and Joining of Materials, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, 917 24 Trnava, Slovakia.
Materials (Basel). 2021 Apr 16;14(8):2002. doi: 10.3390/ma14082002.
The process of laser welding of sheets of HSLA (high-strength low-alloy steel), DP600 (dual-phase steel) and TRIP steels was investigated. A weld was successfully made in a double-sided hot-dip galvanized sheet with a thickness of 0.78-0.81 mm using a laser power of 2 kW per pass without any pretreatment of the weld zone. Microstructure studies revealed the presence of martensitic and ferritic phases in the weld zone, which could be associated with a high rate of its cooling. This made it possible to obtain good strength of the weld, while maintaining sufficient ductility. A relationship between the microstructural features and mechanical properties of welds made in the investigated steels has been established. The highest hardness was found in the alloying region of steels due to the formation of martensite. The hardness test results showed a very narrow soft zone in the heat affected zone (HAZ) adjacent to the weld interface, which does not affect the tensile strength of the weld. The ultimate tensile strength of welds for HSLA steel was 340-450 MPa, for DP600 steel: 580-670 MPa, for TRIP steel: ~700 MPa, respectively, exceeding the strength of base steels.
对高强度低合金钢（HSLA）、双相钢DP600和相变诱发塑性钢（TRIP钢）薄板的激光焊接过程进行了研究。使用每道次2千瓦的激光功率，在厚度为0.78 - 0.81毫米的双面热浸镀锌薄板上成功进行了焊接，且焊接区域未进行任何预处理。微观结构研究表明，焊接区域存在马氏体和铁素体相，这可能与其高冷却速率有关。这使得在保持足够延展性的同时，能够获得良好的焊接强度。已建立了所研究钢种焊接的微观结构特征与力学性能之间的关系。由于马氏体的形成，在钢的合金化区域发现了最高硬度。硬度测试结果表明，在靠近焊缝界面的热影响区（HAZ）存在非常窄的软化区，这并不影响焊缝的抗拉强度。HSLA钢焊缝的极限抗拉强度分别为340 - 450兆帕，DP600钢为580 - 670兆帕，TRIP钢为~700兆帕，均超过了母材的强度。
