摘要:
采用配方均匀设计法,配制了SiO2-MnO2-CaO-TiO2-CaF2-NaF多组元活性剂,利用微型脉冲激光器对500 m厚GH4169高温合金进行了活性剂激光焊接试验。分析并讨论了焊接接头的显微组织和力学性能。试验结果表明,与传统激光焊相比,所配制的20种活性剂均增加了焊缝熔深,并且其中F12系混合活性剂增加熔深能力最为显著,使焊缝深宽比增加了159%,证明通过使用活性剂来增加微激光焊焊缝熔深,降低高温合金板激光焊接的成本是可行的。在活性剂作用下,焊缝显微组织仍由柱状晶和等轴晶组成,接头抗拉强度达到927 MPa,为母材强度的92.7%。
Abstract:
Six kinds of analytically pure compounds, SiO2, MnO2, CaO, TiO2, CaF2, and NaF, were used to make multi-component active fluxes. 500 m thick of GH4169 superalloy sheets were welded by active laser welding process using micro pulse laser equipment. Effects of fluxes on microstructure and mechanical properties of the joints were investigated and discussed. The results showed that the weld bead penetration was increased by all 20 series of active fluxes compared with conventional laser welding. The effect of series F12 was especially notable and the increment of depth to width ratio of the weld was 159%. It is feasible to increase weld penetration thus to improve welding efficiency and reduce welding consumption using active fluxes. Microstructures in active laser welding seams were columnar and equiaxed grains and the joint tensile strength is 927 MPa, which was 92.7% of the base metal strength.
点击查看大图
下载:
