针对一台因衬里层焊缝腐蚀渗漏而失效的尿素合成塔，进行了现场修理。在我国的尿素塔修理史上，第一次采用在原对接焊缝上增设焊缝盖板的结构；第一次运用氩弧焊技术对盖板等进行组焊。按照原图的技术要求，对修理后的尿塔进行了水压试验和氨渗透试验，均一次合格。 Site repairs were performed on a urea synthesis column that failed due to erosion of the lining weld. In the history of urea tower repairing in our country, the structure of adding welding seam cover on the original butt weld was adopted for the first time; the first welding welding of the cover plate and the like by argon arc welding was carried out. In accordance with the technical requirements of the original map, after the repair of the urine tower hydrostatic test and ammonia penetration test, were qualified.