【正文】 筒節(jié)，封頭與接管的焊接處開設相應坡口 。按照設計圖紙，在放樣平臺上 1： 1比例，繪出結構圖，用數(shù)控氣割機自動切割下料。 1 1 產品介紹 ...................................................................................................................... 3 產品的技術條件 .................................................................................................. 3 產品結構設計分析 .............................................................................................. 3 2 材料的焊接性分析 ........................................................................................................ 3 20鋼的焊接性分析 .............................................................................................. 3 化學成分 ................................................................................................... 3 力學性能 ................................................................................................... 4 焊接性能 ................................................................................................... 4 A3 鋼焊接性分析 ................................................................................................. 4 化學成分 .......................................................................................................... 4 力學性能 ................................................................................................... 4 焊接性能 .................................................................................................... 4 3 備料加工工藝過程 ........................................................................................................ 4 壓力容器基本結構 ............................................................................................... 4 筒節(jié)的加工工藝過程 ........................................................................................... 5 備料 .......................................................................................................... 5 下料 .......................................................................................................... 5 卷制 .......................................................................................................... 5 坡口加工 ................................................................................................... 5 縱縫組對 ................................................................................................... 6 焊前清理 ................................................................................................... 6 焊接設備 ................................................................................................... 6 筒節(jié)縱縫焊接 ............................................................................................ 6 矯圓 .......................................................................................................... 6 封頭的加工工藝過程 ........................................................................................... 6