为了研究激光功率对船舶钢激光-熔化极惰性气体复合焊焊缝成型的影响，采用不同激光功率在7mm AH36船舶钢板上进行对接工艺试验，并进行了微观组织观测和力学性能测试，通过理论分析和实验验证，取得了焊缝成型最佳的工艺参量、焊缝接头不同区域微观组织、力学性能等数据。结果表明，在激光功率为6kW、电流为220A、焊接速率为1.2m/min时焊接，焊缝成型最好，焊缝区组织为板条马氏体及少量铁素体，其抗拉强度为545MPa，力学性能符合国家标准和中国船级社材料与焊接规范要求。这对于船舶钢的激光复合焊接具有一定的指导意义。

In order to study the influence of laser power on the formation of laser-metal inert-gas composite welding seam of ship steel, joint test of 7mm AH36 ship steel plate with different laser powers, microstructure observation and mechanical properties test were carried out. Theoretical analysis and experimental verification were carried out. The optimum technological parameters of weld forming, microstructures and mechanical properties of different regions of weld joints were obtained. The results show that, at laser power of 6kW, current of 220A and welding rate of 1.2m/min, weld forming is the best. The structure of weld zone is lath martensite and a little ferrite. Its tensile strength is 545MPa. The mechanical properties meet the requirements of national standards and China Classification Society specifications. This has certain guiding significance for laser hybrid welding of ship steel.