焊接是合金结构钢连接的主要方式之一，而焊接热影响区的耐腐蚀性能较其他区域而言是较差的。为了提高焊接热影响区的耐腐蚀性能，采用激光表面淬火技术对焊缝热影响区进行表面处理。通过正交试验，得到优化后的激光淬火工艺参数。电化学测试结果表明，采用激光淬火后30CrMnSi焊缝热影响区的自腐蚀电流得到显著降低，而越小的自腐蚀电流就意味着较好的耐腐蚀性能。因此，采用激光表面淬火处理技术，可以显著地提高30CrMnSi焊缝热影响区的耐腐蚀性能。

Welding is a main joint way of the alloy constructional steel. The welding heat affected zone (HAZ) is more sensitive to corrosion in comparison with other areas. In order to increase the corrosion resistance of the welding HAZ, laser surface quenching is used to treat the welding HAZ. According to the results of the orthogonal test, the optimized processing parameters are obtained. Based on the electrochemical analysis, it is found that the corrosion current of 30CrMnSi welding HAZ can be decreased obviously by laser quenching technology. So the corrosion resistance of the HAZ can be improved effectively with this method.