expansion joining
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Is the expansion degree mentioned in GB151 the expansion ratio? Is the clearance size between the tube sheet hole and the outer wall of the heat exchange tube equal to the tube sheet hole minus the outer diameter of the heat exchange tube? Request expansion joint inspection record
Expansion rates of various materials: Strength expansion rate – 5~8%, 6~9%, 8~40%, 4~6%; Mild expansion rate – 1~2% -------
Yes, the negative deviation of the pipe material also needs to be considered.
If it is a strength expansion, an expansion welding test must be conducted, and evaluation specimens should be prepared. No requirements for sticking and expanding.
There is a formula for the tube expansion rate.