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铜及其合金材料热导性良好、反射率高,采用单一激光焊接难度较大。提出绿-红外双波长脉冲激光同轴复合焊接方法,并研制了焊接系统。系统的绿激光脉冲能量为255.4mJ,功率稳定度为±2%;消色差焊接头保证了T2紫铜的双波长激光同轴复合精密焊接。对焊缝进行显微组织及显微硬度测试,结果表明,焊缝光滑平整,无缺陷;焊缝正面高度与母材区的持平,宽度约为0.5mm,焊缝反面高度略低于母材区,宽度约为0.4mm;焊缝平均显微硬度为134HV,为母材的64.8%,未出现严重的软化现象。
Good thermal conductivity of copper and its alloys, high reflectivity, the use of a single laser welding more difficult. The green-infrared dual-wavelength pulsed laser coaxial composite welding method was proposed and the welding system was developed. The system’s green laser pulse energy is 255.4mJ and the power stability is ± 2%. The achromatic solder joint ensures the precision welding of the dual-wavelength laser coaxial composite of T2 copper. The microstructure and microhardness of the weld were tested. The results showed that the weld was smooth and without defects. The height of the weld front was the same as that of the base metal. The width of the weld was about 0.5mm, District, the width of about 0.4mm; weld average microhardness of 134HV, 64.8% of the base metal, did not appear serious softening phenomenon.