激光复合焊接综合了激光焊和电弧焊的优点，使其成为船用大厚度钢板高效焊接最有前景的方法之一。研究了船用钢板的高功率CO2激光焊接工艺，重点分析了保护气体成分对焊缝化学成分的影响，激光与电弧间距对焊接过程稳定性的影响。在工艺参数优化的基础上实现14 mm厚10Ni3CrMoV钢板的高功率激光T型结构焊接。获得的焊缝通过X光探伤检验，没有发现裂纹，存在少量不连续的小气孔。采用光学显微镜分析了焊接接头微观组织，结果表明，微观组织显示了焊接接头较好的综合力学性能，尤其是经历重熔与热处理后的焊缝组织发生明显细化。测试了焊接接头不同部位的硬度，焊接接头最大硬度小于360 HV，符合船用技术要求。

Laser hybrid welding has become one of the most promising welding methods used to weld ship thickness steel plates with high efficiency due to combining the advantage of laser welding and arc welding. CO2 laser hybrid welding processes of ship steel plates are studied. The influences of the shielding gas composition on the chemical composition of weld and the distance between the laser beam and arc on the stability of the welding process are mainly analyzed. Based on the optimizing process parameters, 10Ni3CrMoV steel plates with a thickness of 14 mm are welded on both sides in T joint form using high-power laser hybrid welding. The welds produced are assessed by X ray. No crack is found and there is only a small amount of pores. The microstructures of welded joints are examined by optical microscope. The results show that the microstructure of welded joints has good comprehensive mechanical properties. Especially after the weld overlap region experiences a re-melting and heat treatment, the microstructure is refined. The microhardness of welded joints is tested in different regions. The maximum hardness of welded joints is less than 360 HV. The welds obtained can meet the technical requirements for shipbuilding industry.