Tube sheet cladding and composite tube sheets
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I would like to ask the teachers: Is it better to use surfacing welding for composite tube sheets, or explosive cladding? Why?
Cladding would be a better choice. Because surfacing provides a better bond than explosive cladding, which is beneficial to the welding quality of heat exchange tubes. Also, the temperature difference on both sides of the tube sheet can be quite large, which is not favorable for the double-layer structure.
For heat exchanger tube sheets, whether made of sheet metal or forgings, cladding is generally used more frequently, while composite sheets are less common.
May I ask: How can surfacing be used to prevent tube sheet deformation? What are the process measures for this purpose, and how can its efficiency be improved? What are the common surfacing processes?
During the surfacing process, it is necessary to keep the heat input per unit area at a low value to minimize deformation. Generally, welding overlays cause deformation, so a machining allowance needs to be left. Automatic strip welding is fast. As for the process, I’m sorry.
For a batch of special-material heat exchangers we designed, since they are made of Zr material and cannot be welded to carbon steel, tube sheets made of composite plates were used.
Thank you for your explanation; it was very enlightening
Using spot welding can reduce deformation, right? Adding rigid fixation is also an option.