采用3kW横流CO_2激光器对不同厚度的钢板进行焊接实验,研究了激光功率、焊接速度、离焦量以及侧吹气流量对焊接质量的影响,并对焊接样品进行显微硬度分析和力学性能测试。实验结果表明:通过选择合适的焊接参数,能得到较为理想的焊缝,且焊区的显微硬度和抗拉强度都较基体有所提高,同时通过一定的处理,焊区同样还具有较好的韧性。 A 3kW cross-flow CO_2 laser was used to weld the steel plates with different thicknesses. The effects of laser power, welding speed, defocusing power and side blown air flow on welding quality were studied. The microhardness and mechanical properties of the welded samples were tested. The experimental results show that the optimum welding seam can be obtained by selecting the appropriate welding parameters, and the microhardness and tensile strength of the welding zone are better than the matrix. At the same time, the welding zone also has a better performance Toughness.