All welded plate and frame type heat exchanger tube plate in the cause of the crack
Plate and frame type all welded the cause of the crack of exchanger tube sheet, tube plate material plate and frame type 1 full welding heat exchanger tube plate adopts 20 r forging processing, the diameter of the tube plate is 1.
5 m, tube thickness is 200 mm, tube sheet and tube expanding after welding is used to connect.
General article tube plate, there are many cracks, and the upper tube plate crack more concentrated.
Crack originated in the tube sheet and tube bundle joint clearance, crack is circular and radial since bundle tube plate to extension.
2, corrosion, medium corrosion, mainly containing Fe, Al, C, S, Si, O, Cu.
Fe, Cu mainly comes from the steel itself.
C and S derived from oil, O, Si, Al from silicon aluminate cracking catalyst.
If all welded plate and frame type heat exchanger tube plate cracking, monitor the oil into the crack, will produce larger corrode action.
3, tube plate group all welded plate and frame type heat exchanger tube plate fracture formation, color gray, no plastic deformation, belongs to brittle fracture.
The crack originated in the groove, the dendritic spread outward, the sharp tail, the macro fracture formation of transient breaking area, clearer appearance.
All welded plate and frame type heat exchanger, macro crack has the characteristics of the typical morphology of stress corrosion crack.