为了研究不同激光功率对摆动焊接钢/铝材料的影响, 采用大功率碟片激光器和PFO3D摆动接头相结合, 对DP780双相钢和5083铝合金两种金属进行了搭接实验。结果表明,1400W~1600W的功率区间内可有效实现板材焊接; 激光功率为1400W时, 焊接接头的金相组织为低碳马氏体, 显微硬度的最低值和最高值分别位于热影响区和焊缝中心; 随着激光功率的增加, 焊缝内的铁素体增多, 马氏体减少, 接头显微硬度的最高值和最低值分别改为热影响区和焊缝中心; 当激光功率为1400W时,焊缝抗拉强度最高为2681MPa。此研究结果在船舶制造的领域应用具有较为重要的意义。

In order to study the influence of different laser power on swing welding steel/aluminum, the lap experiments of DP780 dual-phase steel and 5083 aluminum alloy were carried out by combining a high-power disc laser with a swing joint of PFO3D. The experimental results show that the plate welding can be effectively realized within the power range of 1400W~1600W. When the laser power is 1400W, the microstructure of the welded joint is low carbon martensite, and the lowest and highest microhardness are located in the heat affected zone and the weld center, respectively. With the increase of laser power, the amount of ferrite in the weld increases, while the amount of martensite decreases. The maximum and minimum values of microhardness of the joint are changed to heat affected zone and weld center, respectively. When the laser power is 1400W, the tensile strength of the weld is the highest, which is 2681MPa. The research results are of great significance in the field of shipbuilding.