不同激光清洗功率对扁铜线焊点性能的影响

Effect of laser cleaning power on the performance of flat copper wire solder joints

针对新能源汽车驱动电机定子扁铜线的生产需求,对扁铜线进行激光清洗以及激光焊接试验,改变激光清洗的工艺参数,并考察了清洗表面的组织形貌、表面粗糙度、显微硬度,发现当激光功率为500 W时具有最佳的清洗效果,其表面粗糙度为Ra 1.55,表面硬度为82.8 HV,接近裸铜线状态。随后对使用不同清洗工艺得到的铜线进行焊接试验,探究激光清洗工艺对焊点性能的影响。结果表明,焊点孔隙率与清洗后的铜线表面粗糙度基本呈线性分布,激光清洗可有效改善焊点的组织形貌及力学性能。最后研究了焊接工艺对焊点性能的影响,当使用4 000 W功率的激光对扁铜线进行焊接,得到的焊点具有良好的成形状态和最高的抗剪强度,为128 MPa,从而得出了扁铜线清洗与焊接的最佳工艺。

For the new energy vehicle drive motor stator flat copper wire production needs,flat copper wire laser cleaning and laser welding test,change the laser cleaning process parameters,and examined the cleaning sur-face of the organization morphology,surface roughness,microhardness,found that when the laser power of 500 W has the best cleaning effect,the surface roughness of Ra 1.55,surface hardness of 82.8 HV,close to the bare copper wire state.copper wire.Subsequently,the copper wires obtained by different cleaning processes were subjected to welding tests to investigate the effect of laser cleaning process on the performance of the wel-ded joints.The results show that the porosity of the welded joints and the surface roughness of the cleaned cop-per wire are basically linearly distributed,and the laser cleaning can effectively improve the organization and mechanical properties of the welded joints.Finally,the effect of welding process on the properties of the welded joints was studied,when the flat copper wire was welded using a 4000 W power laser,the welded joints ob-tained had a good molding state of the highest shear strength,which was 128 MPa,thus deriving the optimal process for cleaning and welding of flat copper wire.