论文部分内容阅读
采用不同的激光功率,进行了不等厚DP600/DP980异种高强钢的激光对接焊,并对接头的显微硬度、拉伸和冲击性能进行了测试,观察了接头的显微组织和拉伸断口形貌。结果表明,随激光功率从1.5 k W增加至3.5 k W,焊缝中心晶粒先细化后粗化,熔合区平均晶粒尺寸先减小后增大,抗拉强度和冲击吸收功均先增大后减小;激光功率优选为2.5 k W,此时焊缝硬度最低值与最高值的差异仅为9 HV。
Using different laser powers, laser butt welding of different strength high strength steel DP600 / DP980 was carried out, and the microhardness, tensile and impact properties of the joint were tested. The microstructure and tensile fracture of the joint Topography The results show that as the laser power increases from 1.5 kW to 3.5 kW, the grain size of the weld center is refined and then roughened. The average grain size of the weld zone first decreases and then increases, and both the tensile strength and the impact absorption power Increases and then decreases; the laser power is preferably 2.5 kw, at which point the difference between the minimum and maximum weld hardness is only 9 HV.