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July 13, 2023
It has high anti-vibration fatigue strength, can withstand high temperature and high pressure, and has good mechanical properties of welded joints; internal non-destructive testing can be performed on joints, and the internal quality of welds can be controlled, which improves the reliability of welds. However, the assembly of the inner hole welding technology is difficult, the requirements for welding technology are high, the manufacturing and inspection are complicated, and the manufacturing cost is relatively high. With the development of high temperature, high pressure and large-scale heat exchangers, the requirements for its manufacturing quality are getting higher and higher, and the inner hole welding technology will be more widely used.
2. Expansion
Expansion joint is a traditional connection method between heat exchange tubes and tube sheets. The tube sheet and tubes are elastic-plastically deformed to form a firm connection by using tube expansion equipment to achieve the purpose of sealing and resistance to pull-off. In the manufacturing process of heat exchangers, expansion joints are suitable for occasions where there is no severe vibration, no excessive temperature changes, and no severe stress corrosion.
The expansion joints currently used mainly include mechanical rolling and hydraulic expansion. The mechanical rolling expansion joint is uneven, and once the connection between the tube and the tube sheet fails, it is very difficult to repair it with the expansion tube; the liquid bag hydraulic expansion joint is controlled by the computer, with high precision, and can ensure the uniform tightness of the expansion joint. The reliability of the connection is better than mechanical expansion joints. However, there are strict requirements on machining accuracy, and it is difficult to ensure the success of expansion joints for densely distributed joints. If it fails, it is also difficult to expand and repair it.
The above is the Connection of heat exchange tubes and tube sheets in shell and tube heat exchangers(Ⅰ) we have listed for you. You can submit the following form to obtain more industry information we provide for you.
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