换热管与管板的连接工艺试验..doc

换热管与管板的连接工艺试验 张 庆 生 （开封东京空分集团有限公司，河南省开封市北关街8号 475001） 摘要：在现代的空分设备上，使用的二级冷却器采用贴胀+密封焊连接的不锈钢内翅片换热管与管板出现串漏，分析其原因认为是：不锈钢内翅片换热管制造时，受缩头加工，不锈钢内翅片换热管冷作硬化，管头处内应力产生，内翅片换热管与管板的焊接为局部焊接，受焊接时，热输入产生的热量影响，内翅片换热管管头内应力不均匀释放，造成内翅片换热管管头处的母材与焊缝之间的熔合区、热影响区多处出现细小裂纹，从而发生了换热管的泄漏。为了解决二级冷却器换热管与管板的连接的泄漏问题，我们采用了重新做换热管与管板的连接工艺试验，通过试验得出结论：换热管与管板的连接，采用强度胀连接。 关键词：二级冷却器；串漏；内应力；工艺试验；强度胀 Change a hot tube and take care of knothole a conjunction a craft experiment Zhang Qing-sheng (Kaifeng Dongjing Air Separation Group Co., Ltd., 8# Beiguan Street, Kaifeng 475001, Henan, P. R. China) Abstract: In the modern of empty cent equipments up, usage of the second class water cooler adoption stick bulge+seal completely the wings slice inside the stainless steel of the weld conjunction to change hot tube and tube the plank appear a string to leak, analyze its reason to think BE:The wings slice inside the stainless steel change When the hot control build, is process by the compress head, the wings slice inside the stainless steel changes a hot tube cold make hardening, the tube head internal help dint creation, inside the wings slice change hot tube and tube the knothole weld to weld for the part, is weld, the heat inputs output calories influence, inside the wings slice change the hot tube tube head internal help dint asymmetry to release, resulting in inside the wings slice change the female material and weld of the hot tube tube head to sew of the fusion of match area,heat to influence many areas to appear small crack, taking place to change a hot tube thus of leakiness.For the sake of leakiness problem resolved second class water cooler to change a hot tube and taken care of knothole a conjunction, we adopted to re- do to change hot tube and tube knothole conjunction craft experiment, pass experiment conclusion:Change hot tube and tube knothole conjunction, adopt the strength bulge conjunction. Keywords: Second class water cooler；The string leak；Internal help dint；The craft experiment；Strength bu