针对双金属层状复合材料板材与管材的焊接，提出采用高亮度激光共熔池穿透焊接方案，实现其沿垂直层状方向的同步焊接，并能获得满足表面耐蚀性要求的焊接接头新思路。拟采用理论分析、试验测试、多相多尺度有限元分析相结合的研究方法，揭示双金属层状复合材料高亮度激光共熔池穿透焊时，在熔池上下表面附近形成独立涡流的非对称熔池流动行为，研究高亮度激光工艺参量、双金属层状材料厚度及其比例、对接间隙、外加磁搅拌和填丝技术等对非对称熔池流动的影响规律，探索非对称熔池流动形成“三明治夹层“状焊接接头形貌的形成机理，表征“三明治夹层“状焊接接头的微区组织性能、残余应力形成与分布规律，建立微区组织性能、残余应力和表面耐蚀性的综合评价体系，制定高亮度激光共熔池穿透焊技术规程。研究成果将丰富层状复合材料的制备与高效焊接技术，对于对复合材料结构的优化设计和服役性能预测具有重要意义。

For the welding of bimetal laminar composite plates and pipes, a high-brightness laser penetration welding with a communal melting pool was proposed to achieve synchronous welding of both layers and meeting the requirements of surface corrosion resistance. The project plans to adopt a combination of theoretical analysis, experimental testing, and multi-phase multi-scale numerical analysis to reveal the asymmetric molten pool flow behavior of independent vortex formed near the upper and lower surfaces when the bimetal laminar composite is welded by high-power laser with a communal melting pool, to study the influence of high-brightness laser process parameters, bimetal lamellar material thickness and its inter-layers proportion, butt gap, external magnetic stirring and wire-filling parameters on asymmetrical molten pool flow, to explore the formation mechanism of sandwich-shaped welded joint through asymmetrical molten pool flowing, to characterize the microstructure, properties and residual stress distributes of sandwich-shaped welded joints, to establish a comprehensive evaluation system for microstructure properties, residual stress and surface corrosion resistance for the joints, and to develop a technical procedure for high-brightness laser penetration welding of bimetal laminar composite plates. The achievements will enrich the knowledge about the preparation and high efficient manufacturing of welded structures of layered composites, and it is of great significance to optimize the structure design of and to predict service performance of these structure.