摘要
桩腿是自升自航式风电安装船重要承载结构。在焊接预热过程中,海工八边形桩腿由于其结构的复杂性容易产生冷却速率不一致,从而导致焊接变形现象。提出八角形桩腿选区电磁感应焊前精确预热技术,并基于电磁-热耦合仿真方法研究模拟了恒电流、线性电流、优化线性电流3种不同的感应电流加载方式对温度场的影响。结果表明:不同的电流加载方式下,围板和导向板正反面温度场均不同。在导向板基底电流为165 A,围板基底电流为92 A,电流加载频率为10 kHz时,通过优化线性电流加载幅度,加热22 min时,在焊缝两侧75 mm范围内,正面温度为154.8~181℃,反面温度为150~180.6℃,围板在焊缝两侧100mm的范围内,正面温度为112.4~150.6℃,反面温度为106.2~151.2℃,桩腿围板和导向板正反两面温度均满足精确选区预热的温度场要求且较为均匀。该研究对后续八边形桩腿焊接制造工艺具有重要的理论指导价值。
Pile leg is an important bearing structure of a self-raised self-propelled wind power installation ship. In the process of welding preheating, the inconsistency of cooling rate due to the complexity of its structure, which leads to welding deformation. The exact preheating technology for electromagnetic induction welding was presented, and the influence of three different induction current loading modes of constant current and optimized linear current on the temperature field were studied based on the electromagnetic-thermal coupling simulation method. The results show that under the current loading modes, the plate and guide fields are different. When the guide plate base current of 165 A, boarding plate base current of is 92 A, current loading frequency of 10 kHz, by optimizing the linear current loading range and heating 22 min, the front temperature is 154.8~181 ℃, the reverse temperature is 150~180.6 ℃, 100 mm on both sides of the weld, the front temperature is 112.4~150.6 ℃, the reverse temperature is 106.2~151.2 ℃, leg circumference and guide plate meet the temperature field requirements of accurate constituency preheating and relatively uniform. The study has an important theoretical guiding value for the subsequent manufacturing process of octagonal pile leg welding.
作者
赖柏豪
宋健
张永康
Lai Bohao;Song Jian;Zhang Yongkang(School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China)
出处
《机电工程技术》
2021年第11期37-43,共7页
Mechanical & Electrical Engineering Technology
基金
广东省海洋经济发展(海洋六大产业)专项资金项目(编号:粤自然资合[2020]017号)。
关键词
自航自升风电安装船
八角形桩腿
电磁感应
选区预热
线性加载
self-propelled wind power installation ship
octagonal pile leg
electromagnetic induction
constituency preheating
linear loading
