为提高金属与塑料的激光焊接头强度，提出了异种材料的微结构激光焊的方法. 为探究表面微结构参数对金属与塑料激光焊头强度的影响，焊接前采用飞秒激光在金属表面制备了不同参数的微结构；采用拉伸剪切试验、连接界面以及断面微观观测等方式探究了微结构参数对焊接接头强度的影响机制. 结果表明，金属与塑料的焊接接头强度与微结构的填充效果以及连接面积有关，随着微结构尺寸的增加，金属与塑料焊接接头强度增加，但过大的微结构尺寸会使得熔融塑料无法对微结构进行充分填充，未填充缺陷的出现会使焊接接头的强度减小； 随着间隔距离的增加，微结构覆盖率下降，金属与塑料有效连接面积减少，焊接接头强度持续减小.
In order to improve the strength of laser welding joints between metal and plastic, a method of microstructure laser welding of dissimilar materials was proposed. In order to explore the influence of surface microstructure parameters on the strength of metal and plastic laser welding joints, femtosecond laser was used. Microstructures with different parameters were prepared on the surface. The influence mechanism of microstructure parameters on the strength of welded joints was explored by means of tensile shear experiments, connection interface and cross-sectional microscopic observations. The joint strength is related to the filling effect of the microstructure and the connection area. As the size of the microstructure increases, the strength of the metal-plastic welded joint increases, but too large size of the microstructure will make it impossible for the molten plastic to fully fill the microstructure. The appearance of unfilled defects will reduce the strength of the welded joint. As the separation distance increases, the microstructure coverage decreases, the effective connection area between metal and plastic decreases, and the strength of welded joints continues to decrease.
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