大型高压低温绕管换热器不锈钢外壳和紫铜芯体焊接.pdf

　制　造　与　安　装　 大型高压低温绕管换热器不锈钢外壳 及紫铜芯体的焊接 曾传勇, 曾　辉 ( ) 开封空分集团有限公司, 河南 开封 　475002 摘 　要 :分析了大型、高压、低温绕管换热器的结构特点, 找出了焊接的三大难点 :即奥氏体不锈钢焊 接接头的低温韧性如何保障; 大型紫铜绕管芯体的现场对接; 不锈钢管板与紫铜管异种金属的焊 接。针对难点进行了一系列的试验研究。完成 12 项焊接工艺评定, 并用于生产, 完成了出口美国 产品的制造。 关键词 :绕管换热器; 无钎剂钎焊; 氩弧钎焊 ( ) 中图分类号:TG4575 　　文献标识码 :B 　　文章编号 :1001 - 4837 2003 12 - 0027 - 05 Welding between Shell and Core Bar of Large - scale Heat Exchanger at High Pressure and Low Temperature ZENG Chuan - yong , ZENG Hui ( Kaifeng Air Separation Group Co. ,Ltd. ,Kaifeng 475002 ,China) Abstract :Design feature of large - scale heat exchanger at high pressure and low temperature was analysised in this paper. To protect the toughness of low temperature about welding joint ,field docking of large sized core bar made of red copper ,welding between stainless tube plate and red copper pipe were the difficult of welding. A series of test , - 196 ℃impact test of stainless welding joint , - 196 ℃fatigue test of red copper pipe welding joint ,expansion joint between stainless plate and red copper pipe ,silver brazing ,high pressure and low temper ature property test of argon - arc welding joint were taken on to solve the problem. Qualification of welding pro cedure was finished. Key words :heat exchanger ;solder without soldering acid ;argon - arc solder 　　1999 年, 开封空分集团公司为美国某空分公司 - A 级。换热器要作模拟工况 - 196 ℃的低温疲劳 ( ) 制造了一台大型液氧换热器, 外形如图 1 a 。其总 试验