Welding defects control for Ni-based weld metal and development of welding material

LU Shanping; ZHANG Xu; ZHOU Hui; MO Wenlin

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Welding defects control for Ni-based weld metal and development of welding material
Vol. 49, Issue 4, Pages: 32-36(2019)
Published：2019
DOI：
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DOI：

LU Shanping, ZHANG Xu, ZHOU Hui, et al. Welding defects control for Ni-based weld metal and development of welding material[J]. Eletric Welding Machine2019, 49(4): 32-36. DOI：

摘要

镍基焊材在核电主设备制备中有着重要的应用

镍基焊材的性能很大程度上决定了核电设备的服役寿命。通过分析镍基焊缝金属焊接过程中常出现的失塑裂纹和点状夹杂两类焊接缺陷

设计并制备了不同Nb、Mo含量的镍基合金焊丝。结果表明

Ti会促进镍基焊缝金属中点状夹杂的出现;随着Nb、Mo含量的增加

镍基合金焊缝金属的室温强度逐渐增加

且焊缝金属的塑性得到大幅提升。Nb、Mo元素的添加

有效地改善了镍基焊缝金属中失塑裂纹与点状夹杂缺陷。通过调整成分获得了满足核电主设备使用要求的镍基合金焊丝。

Abstract

Ni-based welding material has a widely application in the fabrication of the key components in nuclear power plants. Two types of welding defects

ductility-dip crack and point-like defect

in the Ni-based weld metals are investigated. Based on the calculation results by Thermo-calc with TTNi8 database

several welding wires containing different Nb and Mo contents are designed and fabricated. The results show that the room temperature strength and plasticity of the weld metals improve as the Nb or Mo content increases

which effectively reduce the ductility-dip cracks and point-like defects. Finally

Ni-based welding wire with high welding defects resistant is obtained

which can meet the use requirements for nuclear power plants.