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阐述了７００ＭＷ机组大型汽包管座焊缝缺陷发现情况，分析了缺陷产生的原因，并介绍了日本厂家对汽包大面积修补和热处理过程，提出了缺陷发现过程遇到的一些问题
The defects of welds in large-sized steam tube socket of 700MW unit are described, the causes of the defects are analyzed, and the Japanese manufacturers are also required to repair the large area of the drums and the heat treatment process. Some problems encountered during the defect discovery process