Smooth the inner ring seam of the cylinder
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When manufacturing heat exchangers with a diameter of 400, the butt welds of the cylinder are sometimes located in the middle, and it’s not possible to get inside; as a result, it becomes difficult to grind those internal welds smooth. I wonder how my colleagues solve this problem? Please give me some advice!
For the cracks that cannot be ground from the inside, TIG welding can be used for backing.
DN400 can use GTAW for the root pass and SMAW for the cover pass
Is your heat exchanger very long? If that’s the case, you’ll have to weld a ring weld section by section.
Recently, we have also come across quite a few heat exchangers of DN350 and DN400 type; their shells are very long, and we would like to replace them with steel tubes for the shells, but the design agency refuses to do so. Flattening the circumferential seam is a hassle; TIG welding is used as the root pass method, and there are always some weld beads at the bottom of the overall weld, which causes some concern during assembly.