脉冲激光填丝焊对镍基合金薄板焊缝成形及微观组织的影响
发布时间：2018-08-01 10:58
【摘要】：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。
[Abstract]:In order to solve the problem that thin plate weld is liable to produce negative excess in laser welding and meet the requirements of high assembly precision, the laser wire filling welding (LWFW) technology is proposed. The LWFW experiment of Hastelloy C-276 shield material is carried out. The influence of process parameters on the weld morphology is studied, and the microstructure and elements in different regions of the joint are analyzed. The results show that the welding joint with high and lower surface can be obtained by using LWFW, and the weld joints with high and lower surface can be obtained. Under the optimal process parameters, the weld grain can be obtained and the contact angle is basically the same. The grain refinement of the weld is obvious. There is no obvious heat influence zone at the junction of the parent material and the melting line, and the elements of the different melting zone of the weld seam are divided. There is no obvious macro segregation, but the Mo element in the columnar dendrite region exists microsegregation. The microhardness distribution of the joint at different melting regions is uniform, and the hardness value is basically equal to that of the parent material.
【作者单位】： 大连理工大学精密与特种加工教育部重点实验室;
【基金】：国家973计划(2015CB057305) 创新研究群体科学基金(51321004) 中央高校基本科研业务费专项资金[DUT16RC(3)012]
【分类号】：TG456.7
[Abstract]:In order to solve the problem that thin plate weld is liable to produce negative excess in laser welding and meet the requirements of high assembly precision, the laser wire filling welding (LWFW) technology is proposed. The LWFW experiment of Hastelloy C-276 shield material is carried out. The influence of process parameters on the weld morphology is studied, and the microstructure and elements in different regions of the joint are analyzed. The results show that the welding joint with high and lower surface can be obtained by using LWFW, and the weld joints with high and lower surface can be obtained. Under the optimal process parameters, the weld grain can be obtained and the contact angle is basically the same. The grain refinement of the weld is obvious. There is no obvious heat influence zone at the junction of the parent material and the melting line, and the elements of the different melting zone of the weld seam are divided. There is no obvious macro segregation, but the Mo element in the columnar dendrite region exists microsegregation. The microhardness distribution of the joint at different melting regions is uniform, and the hardness value is basically equal to that of the parent material.
【作者单位】： 大连理工大学精密与特种加工教育部重点实验室;
【基金】：国家973计划(2015CB057305) 创新研究群体科学基金(51321004) 中央高校基本科研业务费专项资金[DUT16RC(3)012]
【分类号】：TG456.7
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