为研究淬火对AS300/MBW500不等厚钢激光填丝焊接头组织性能的影响，在AS300/MBW500不等厚钢激光填丝焊基础上，进行水淬热处理试验。通过分析焊接接头的微观组织、维氏硬度和元素组成，获得水淬热处理对焊接接头的影响规律。结果表明：随着淬火温度的升高，焊接接头组织中Al元素聚集含量增加，焊缝硬度降低；930 ℃时，薄板与焊缝、焊缝与厚板之间的硬度阶梯值相等，焊缝抗拉强度为908 MPa，伸长率为7.5%，提高了不等厚钢激光填丝焊接接头的力学性能。

In order to study the Effects of quenching on the microstructure and properties of AS300/MBW500 unequal-thickness laser wire-filled welded joints, experiment of water quenching heat treatment on the basis of AS300/MBW500 unequal thickness steel laser wire filling welding. By analyzing the microstructure, Vickers hardness and element composition of the welded joint, the effect of water quenching heat treatment on the performance of the welded joint is obtained. As the quenching temperature increases, the accumulation of Al elements in welded joints increases and the hardness of weld decreases. When 930 ℃, the hardness step value between sheet and weld, weld and thick plate is equal, the tensile strength of weld is 908 MPa, the elongation is 7.5%, which increases the mechanical properties of laser wire filling welded of unequal thickness steel.