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1.焊接概况 水除鳞高压管道安装工程是中板2500mm四辊轧机改造工程中的一个重要组成部分,其中高压管道总长200.6m,弯管23件,总焊接接头140个。主要材质:20钢,工作介质:工业净水;压缩空气:工作压力18.5～21.1MPa;管径:102～273mm;管壁厚:14～32mm。 根据图样要求,焊接接头须100％探伤,射线探伤Ⅱ级合格。管道安装在厂房的地沟里施工,这样更增加了焊接的难度。 首先在焊接完10个接头时,经X射线探伤,发现
1. Welding Overview Water descaling high-pressure pipeline installation project is a medium-sized 2500mm four-high rolling mill reconstruction project is an important part of the total length of high pressure pipe 200.6m, 23 elbow, the total welded joints 140. Main material: 20 steel, working medium: industrial water purification; compressed air: working pressure 18.5 ~ 21.1MPa; diameter: 102 ~ 273mm; wall thickness: 14 ~ 32mm. According to the requirements of the drawings, the welded joints shall be 100% flaw detection and the radiographic flaw detection shall be qualified. Pipeline installation in the construction of the trench in the plant, so that more increases the difficulty of welding. First, after welding 10 joints, X-ray inspection found