可控激光束焊接薄壁青铜器工艺实验

采用大功率二氧化碳激光器 (5kW)和大型数控激光加工工作台 (2 0 0 0mm× 1 2 50mm) ,对采用传统青铜器铸造方法制备的不同成分、不同厚度的青铜试样进行激光焊接工艺试验 ,并对焊接部位的组织、结构进行微观测试分析和机械性能测试。初步确定激光焊接一定厚度青铜器所需最佳工艺参数组合 ,用此最佳工艺参数对几件典型的青铜器文物进行了修复。研究项目对提高我国文物修复技术水平 ,具有重要意义。

Controlled laser beam welding used in restoration of thin-wall ancient bronzes

Conservation and restoration researchers concentrate on searching for ways to join the cracked ancient bronzes. Contrary to conventional joining methods, laser welding can join bronzes materials that are heat sensitive or positioned nest to heat sensitive materials. A very small focused spot permits miniature welds with a very small heataffected zone. Welding with no flux offers significant advantages in terms of weld quality and durability. Laser welding provides and opportunity to join similar or dissimilar materials of the bronzes due to th ability to control the location, duration and power of the welding beam. It is ooncluded that adequate parameter selection are necessary during laser welding procedure to have an optimal energy for adequate penetration depth, minimum surface concavity and less voids. Laser welding can be expected to act an important role in the field of conservation and restoration for anceint bronzes.