某化肥厂ＣＯ2 吸收塔在使用中出现气体进口管角焊缝泄漏。停车检查 ,发现因内表面角焊缝有气孔 ,以致强腐蚀介质进入内衬与外筒之间 ,腐蚀外筒导致泄漏 ,接管下部筒体已腐蚀出一个环带状蚀坑 (图 1) ,腐蚀部位外筒体剩余壁厚仅有 0～ 6ｍｍ ,应厂方要求 ,对该缺陷修复处理。图 CO2 leakage in a fertilizer plant gas inlet pipe fillet weld leaks in use. Parking inspection found that the inner surface of the fillet weld holes, resulting in a strong corrosive medium into the lining and the outer tube between the corrosion of the outer cylinder lead to leakage, take over the lower part of the cylinder has corroded a ring-shaped pit (Figure 1) The remaining wall thickness of the corrosion part of the outer cylinder is only 0 ~ 6mm, the factory requirements, the defect repair treatment. Figure