针对激光差厚拼焊板DP600/H340LAD+Z,采用显微硬度测试方法和显微金相组织观察分析方法对其焊缝的特性进行了实验研究。测试分析了母材、焊缝及热影响区的显微硬度和微观组织特性。讨论了焊缝特性对于差厚拼焊板成形性能的影响。结果表明,激光焊缝能够满足板料成形的要求。 According to the difference of laser welding thickness of tailor welded plate DP600 / H340LAD + Z, the characteristics of the weld were experimentally studied by micro hardness test method and microstructure observation and analysis method. The microhardness and microstructure of the base metal, weld and HAZ were analyzed and tested. The influence of weld characteristics on the formability of the tailor welded blanks was discussed. The results show that laser welding can meet the requirements of sheet metal forming.