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Expanded and Welded Tube-to-Tubesheet Construction In heat exchanger manufacturing—especially for shell-and-tube types—expanded and welded refers to the method of attaching tubes to the tubesheet. In this process: Tubes are first expanded (mechanically or hydraulically) into the tubesheet holes, creating a tight, leak-resistant fit. Welding is then performed at the joint between the tube and tubesheet, providing additional strength, sealing, and resistance to leakage, especially under high pressure or corrosive conditions Welded Heat Exchangers: Types and Features Welded heat exchangers include several designs, such as: Welded Plate Heat Exchangers: Plates are welded together instead of being gasketed, allowing for higher pressure and temperature resistance, and minimizing the risk of leaks. These are compact, efficient, and suitable for demanding applications in pharmaceuticals, chemicals, and other process industries. Welded Spiral Heat Exchangers: Feature a spiral design with welded channels, providing exceptional resistance to fouling, efficient heat transfer, and easy cleaning. They are ideal for handling viscous, particulate, or dirty media.
