Cause of Unknown Images in Cryogenic Nickel-based Alloy Weld Radiographic-Inspection Film of LNG Storage Tank

CAI Xiaotao; QI Yanchang; WEI Jinshan; MA Chengyong

doi:10.11973/jxgccl202208006

Materials and Mechanical Engineering > 2022 > 46(8): 33-39. > DOI: 10.11973/jxgccl202208006

CAI Xiaotao, QI Yanchang, WEI Jinshan, MA Chengyong. Cause of Unknown Images in Cryogenic Nickel-based Alloy Weld Radiographic-Inspection Film of LNG Storage Tank[J]. Materials and Mechanical Engineering, 2022, 46(8): 33-39. DOI: 10.11973/jxgccl202208006

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Cause of Unknown Images in Cryogenic Nickel-based Alloy Weld Radiographic-Inspection Film of LNG Storage Tank

1. Department of Welding, Central Iron and Steel Research Institute, Beijing 100081, China;
2. Suzhou Institute of Technology, Jiangsu University of Science and Technology, Zhangjiagang 215600, China

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Received Date: June 01, 2021
Revised Date: July 11, 2022

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Abstract

During the construction of large liquefied natural gas storage tanks, spot-like and floccus unknown images were found on the radiographic-inspection film of the 06Ni9DR steel weld by the ENiCrMo-6 nickel-based alloy electrode. The cause of unknown images was analyzed, and the effect of unknown images on the mechanical properties of weld was studied by microstructure observation, energy spectra analysis, hardness test, cryogenic impact tests, and thermodynamic calculations. The results show that the spot-like and floccus images were mainly caused by large-sized tungsten-rich inclusions and niobium-molybdenum-rich precipitate clusters. The average hardness of areas of inclusions and precipitate clusters were 456, 288 HV, respectively, which were both higher than that of the substrate; the tungsten-rich particles and precipitate clusters had a negative effect on the stability of tensile strength and cryogenic impact toughness of the weld joints. The quantity of unknown images decreased significantly after replacing the electrode. The unknown images were related to uneven mixing of coating components or uneven particle size of the flux during the production of nickel-based alloy electrodes, resulting in the abnormal enrichment of alloy elements in the weld metal.
- nickel-based alloy weld,
- unknown image,
- tungsten-rich particle,
- precipitate cluster,
- welding material

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