航天高强铝合金拉锻式摩擦塞焊成形控制机制与接头强度评价

Aiming at the urgent need for the development of big/heavy rockets in China, this project will study the related fundamental problems for weld forming control mechanism and the joint strength evaluation in friction pull plug welding for the aerospace high strength aluminum alloy. The key scientific problem will around the coupling mechanism of heat generation, heat transfer and plastic material flow, the high accuracy and fast response control mechanism of the welding process driven by big data and knowledge, and the scale problem for the joint strength evaluation. The main contents will include the thermal process and material plastic flow behavior of aluminum alloy during friction pull plug welding, the high accuracy and fast response control strategy for welding process, the optimization of the welding process and control the performance, and method for the evaluation of the joint strength. We focus on to make up the short board of the friction pull plug welding technology for the rocket storage, to improve the process stability, welding quality, and joint properties, and to establish the evaluation method for the joint strength. The results will provide important theoretical basis and technical support for developing the friction pull plug welding for the tank in big/heavy rockets.

项目拟针对我国大/重型火箭发展的迫切需要，研究航天高强铝合金拉锻式摩擦塞焊成形控制机制与接头强度评价相关基础问题。围绕“火箭贮箱铝合金拉锻式摩擦塞焊的产热/传热与材料流动的耦合作用机理、大数据及知识驱动焊接过程高精度快响应控制机制、焊接接头强度评价的尺度问题"三个关键科学问题，重点研究铝合金拉锻式摩擦塞焊热过程与材料塑性流动行为、焊接过程的高精度快响应控制策略、焊接工艺优化及组织性能调控、焊接头强度评价方法相关内容。主要目的是：弥补我国火箭贮箱拉锻式摩擦塞焊技术短板，提高焊接工艺稳定性、焊接质量和接头性能，建立合理的接头强度评价方法，为我国大/重型火箭铝合金贮箱摩擦塞焊提供理论依据和技术支撑。