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为了解决激光自熔焊接时薄板焊缝易产生负余高的问题及满足高装配精度的要求,提出了激光填丝焊接(LWFW)工艺,开展了Hastelloy C-276屏蔽套材料的LWFW实验,研究了工艺参数对焊缝形貌的影响,分析了接头不同区域的显微组织、元素分布及显微硬度特征。结果表明,运用LWFW可以获得上下表面正余高可控的焊接接头,在优化工艺参数条件下可获得上下余高、接触角基本一致的焊缝形貌。焊缝晶粒细化明显,母材与熔化线交界处无明显热影响区,焊缝不同熔化区域元素分布均匀,没有明显的元素宏观偏析,但柱状枝晶区Mo元素存在显微偏析。接头不同熔化区域显微硬度分布均匀,硬度值与母材的基本相当。
In order to solve the problem that the laser welding is easy to produce negative residual height and meet the requirement of high assembly accuracy, laser welding technology (LWFW) is proposed and the LWFW experiment of Hastelloy C-276 shielding material is carried out. The effect of process parameters on the weld morphology was analyzed. The microstructure, elemental distribution and microhardness of the joints were analyzed. The results show that welded joints with positive and negative controllable upper and lower surfaces can be obtained by using LWFW, and the weld topography with the same height up and down and the same contact angle can be obtained under the optimized technological parameters. The grain refinement of the weld is obvious. There is no obvious heat affected zone at the interface between the base metal and the melting line. The elements in different melting zones of the weld are distributed evenly without obvious macro segregation. However, the Mo element in the columnar dendrite zone is slightly segregated. Joint melting area of different microhardness uniform distribution, the hardness value of the base material and the basic equivalent.