Thought question 6: What are the methods of expansion jointing for heat exchange tubes?
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Thought question 6: What are the methods of expansion jointing for heat exchange tubes?
1.3 Swaging. The expansion joining of heat exchange tubes and tube sheets can be divided into two main categories: non-uniform expansion joining (mechanical ball expansion) and uniform expansion joining (hydraulic expansion joining, fluid bag expansion joining, rubber expansion joining, explosive expansion joining). 1.4 Mechanical expansion joining is the earliest form of expansion joining, and it is also the most widely used method today. This method is simple and convenient; oil lubrication is required, and oil contamination undermines the quality of the welded joint after expansion ； Furthermore, this method causes significant cold working stress due to the increase in pipe diameter, and is not suitable for applications subject to stress corrosion.