中国激光, 2018, 45 (5): 0502007, 网络出版: 2018-05-02
20 mm厚316LN不锈钢板的超高功率光纤激光自熔焊 下载: 774次
Autogenous Laser Welding of 20-mm-Thick 316LN Stainless Steel Plate by Ultra High Power Fiber Lasers
激光技术 激光自熔焊 厚板 显微组织 力学性能 laser technique autogenous laser welding thick plate microstructure mechanical properties
摘要
采用20 kW超高功率光纤激光器单道焊接了20 mm厚316LN奥氏体不锈钢, 研究了焊接工艺参数对焊缝成形及宏观形貌的影响, 并对焊接接头的显微组织和力学性能进行了分析。结果表明, 采用负离焦可以得到成形良好的焊缝;焊缝组织为单一的奥氏体组织, 焊缝上部和底部中心区存在等轴晶粒, 焊缝中部中心区为粗大的柱状晶。在优化的工艺参数下, 焊接得到的接头抗拉强度为645 MPa, 与母材相当。焊接接头断裂于熔合线边界处, 为典型的韧性断裂。焊接接头热影响区的显微硬度略高于焊缝和母材。
Abstract
The 20-mm-thick 316LN austenitic stainless steels are welded by the 20 kW ultra high power fiber laser, the effects of welding parameters on the macro-morphologies and weld formation are investigated, and the microstructures and mechanical properties of welded joints are analyzed. The results show that better surface appearances can be obtained via a negative defocusing. The weld microstructure is single austenite and there exist the equiaxed grains in the central areas of the top and bottom zones of welds; in contrast, there exist the coarse columnar grains in the central areas of the middle zone of welds. Under the optimal welding parameters, the tensile strength of welded joints is 645 MPa, equivalent to that of base metals. The fracture of welded joints occurs at the fusion line in a typical ductile manner. The micro-hardness of the heat-affected zone is slightly higher than those of welds and base metal.
信纪军, 方超, 宋云涛, 卫靖, 吴杰峰, 戴文华. 20 mm厚316LN不锈钢板的超高功率光纤激光自熔焊[J]. 中国激光, 2018, 45(5): 0502007. Xin Jijun, Fang Chao, Song Yuntao, Wei Jing, Wu Jiefeng, Dai Wenhua. Autogenous Laser Welding of 20-mm-Thick 316LN Stainless Steel Plate by Ultra High Power Fiber Lasers[J]. Chinese Journal of Lasers, 2018, 45(5): 0502007.