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为了提高紫铜对激光的吸收率,实现低功率激光的紫铜焊接,采用波长532 nm的纳秒激光器对紫铜表面进行预处理,可使紫铜对1064 nm波长激光的反射率从95%降低到15.5%,大大提高了焊接时激光的利用效率。同时,利用500 W光纤激光器对厚度为0.3 mm的紫铜激光焊接工艺展开了研究,对不同焊接速度和离焦量下的焊缝宽度、焊接强度、焊缝显微硬度进行了比较分析,找到了最佳的焊接参数。另外,对黑化处理与涂敷石墨后紫铜的焊接质量进行了比对,发现黑化处理后激光焊接的焊缝显微硬度和抗拉强度均优于涂敷石墨的情况。
In order to improve the absorption rate of copper to laser and achieve the low-power laser welding of copper, the surface of copper is pre-treated with a 532 nm nanosecond laser to reduce the reflectivity of red copper from 10% to 95% , Greatly improving the use of laser welding efficiency. At the same time, the research on the copper laser welding process with a thickness of 0.3 mm was carried out with a 500 W fiber laser. The welding width, welding strength and weld microhardness under different welding speeds and defocus were compared and analyzed. The best welding parameters. In addition, the comparison of the quality of the welding between the blackening treatment and the coating of graphite shows that the microhardness and the tensile strength of the laser welding after blackening treatment are better than the graphite coating.