Discussion on Phased Array Inspection and Repair Technology for Fillet Weld of Temperature Sleeve on Main Steam Pipe of Thermal Power Unit

LI Zhiqiang; MA Zhibao; LIU Chang; GUO Derui; JIA Kaijie; GAO Dawei; ZHANG Yanjun; ZHANG Yifang

doi:10.7512/j.issn.1001-2303.2023.06.20

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Discussion on Phased Array Inspection and Repair Technology for Fillet Weld of Temperature Sleeve on Main Steam Pipe of Thermal Power Unit
Vol. 53, Issue 6, Pages: 135-141(2023)
DOI： 10.7512/j.issn.1001-2303.2023.06.20

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李志强，马志宝，刘畅，等.火电机组主汽管道温度套管角焊缝相控阵检测及修复技术探讨［J］.电焊机，2023，53（6）：135-141.

LI Zhiqiang, MA Zhibao, LIU Chang, et al.Discussion on Phased Array Inspection and Repair Technology for Fillet Weld of Temperature Sleeve on Main Steam Pipe of Thermal Power Unit[J].Electric Welding Machine, 2023, 53(6): 135-141.
李志强，马志宝，刘畅，等.火电机组主汽管道温度套管角焊缝相控阵检测及修复技术探讨［J］.电焊机，2023，53（6）：135-141. DOI： 10.7512/j.issn.1001-2303.2023.06.20.

LI Zhiqiang, MA Zhibao, LIU Chang, et al.Discussion on Phased Array Inspection and Repair Technology for Fillet Weld of Temperature Sleeve on Main Steam Pipe of Thermal Power Unit[J].Electric Welding Machine, 2023, 53(6): 135-141. DOI： 10.7512/j.issn.1001-2303.2023.06.20.

摘要

通过对火电机组主汽管道上直埋式温度套管角焊缝进行相控阵检测，发现焊缝中存在大量的内部超标缺陷。对角焊缝缺陷部位进行挖除过程中，发现焊缝内部存在大量夹渣、气孔以及未熔合缺陷，与相控阵检测缺陷位置匹配良好。通过制定合理的焊接工艺和焊后热处理工艺，成功修复焊缝缺陷。总结得出，应对运行时间超过10万小时的在役机组高温管道直埋式温度套管角焊缝开展相控阵检验；同时，对于直埋式温度套管结构，套管、焊缝和主管为同材质或同类材质，角焊缝内部质量经检测合格后，一般来说能够安全稳定运行。

Abstract

Through the phased array inspection of the fillet weld of the directly buried temperature casing on the main steam pipe of the thermal power unit, it is found that there are a lot of buried defects exceeding the standard in the weld. During the excavation of the defect parts of the fillet weld, a large number of slag inclusion, porosity and non fusion defects were found in the weld, which matched well with the defect positions detected by the phased array. The weld defects were successfully repaired by formulating reasonable welding process and post weld heat treatment process. It is concluded that the phased array inspection should be carried out on the fillet welds of the directly buried temperature casing of the high-temperature pipelines of the in-service units with running time of more than 100,000 hours; At the same time, for the directly buried temperature casing structure, if the casing, weld and main pipe are of the same material or the same material, the internal quality of fillet weld can generally operate safely and stably after passing the inspection.

关键词

相控阵检测焊缝内部缺陷温度套管直埋式结构焊接修复

Keywords

phased array detectioninternal weld defecttemperature sleevedirectly buried structurewelding repair

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