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利用光纤激光研究了环形激光束的形成原理,并利用环形激光束实现了高分子材料的超高速焊接。试验结果表明,随着准直镜焦距的增加,环形激光束的外径不变,内径减小,环形激光束的光环宽度增加;随着第一枚圆锥透镜和第二枚圆锥透镜的间距L12增加,环形激光束的内径和外径同时增加,而环形激光束的光环宽度几乎不变;通过准直镜、第一枚圆锥透镜及第二枚圆锥透镜的同轴性调节,可获得能量密度分布均匀的环形激光束;利用外部直径为54 mm、内部直径为47 mm及宽度为3.5 mm的环形激光束,对厚度为(2+1)mm的高分子材料搭接接头实现了超高速焊接。当试验压力为100 N,激光输出功率为800 W,焊接时间为0.6 s时,高分子材料焊接接头拉伸剪切性能与母材相同,其拉伸剪切断口位于母材(TPV-弹性体)上。
The formation principle of toroidal laser beam was studied by fiber laser, and the super high speed welding of polymer material was realized by toroidal laser beam. The experimental results show that with the increase of the focal length of the collimator lens, the outer diameter of the ring laser beam remains unchanged, the inner diameter decreases and the ring width of the ring laser beam increases. With the distance L12 between the first conical lens and the second conical lens The inner diameter and the outer diameter of the ring laser beam increase at the same time and the ring width of the ring laser beam hardly changes. By adjusting the coaxiality of the first conical lens and the second conical lens, the energy density Uniform ring laser beam; ultra-high-speed welding of (2 + 1) mm thick polymer material lap joints using a ring laser beam with an outer diameter of 54 mm, an inner diameter of 47 mm and a width of 3.5 mm . When the test pressure is 100 N, the laser output power is 800 W and the welding time is 0.6 s, the tensile and shear properties of the welded joints of polymer materials are the same as those of the base metal. The tensile shear fracture is located on the base metal (TPV-elastomer )on.