石油、化工和火力发电等工业,列管式热交换器是一种常用的设备。设备中列管与管板间的固定和密封,惯用服接法,近年来我们以焊接代替胀接,取得良好效果,现介绍于下。用胀接方法制造的设备,由于工作温度高和热膨胀系数较大,或者因为不同材料的热膨胀系数不同,结果管子与管板间的密封很快就被破坏,迫使停车检修,损失很大。且胀接的管子经过几次检修后,很难再保证密封,不得不更换新的管子。据此,我们在1958年 Oil, chemical and thermal power industries, tube heat exchangers is a commonly used equipment. Equipment in the tube and tube plate between the fixed and sealed, the usual way to take the service, in recent years we instead of welded expansion joint, and achieved good results, are introduced below. Equipment manufactured by the expansion method, due to high operating temperature and thermal expansion coefficient, or because of different materials with different thermal expansion coefficient, resulting in the seal between the tube and the tube plate quickly destroyed, forcing the parking maintenance, loss. And swell the pipe after several overhaul, it is difficult to guarantee the seal, had to replace the new tube. Accordingly, we are in 1958