Problems with the compressor volute
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Recently, I saw a steam compressor (with an outlet pressure of no more than 2 bar) whose volute was actually welded together. Is it possible to do this? Can’t we use casting?
It actually depends mainly on the level of precision required; both casting and welding methods are viable.
High-pressure casting? Welding at low pressure?
Could you share the photos? I’d like to see them
In my opinion, when the changes are minor, casting is usually used, while welding is employed when the changes are significant. This is related to the requirements of your owner, as well as the complexity of the manufacturing process employed by the manufacturer.
Sure, these days many volutes of large steam turbines are welded; as long as the welding process is proper, that’s fine
Now, welding is used in most cases for two reasons: 1, the casting process is costly, and defects and cracks are likely to occur, resulting in greater losses. 2. Welding skills are gradually improving, with various automatic welding methods being adopted one after another, and post-weld heat treatment is also being enhanced.
Welding is completely feasible; it depends mainly on the complexity of the shell’s structure. By taking into account both casting and welding processes, the best option can be chosen, and in terms of strength, both methods can meet the requirements
If it’s too complex, the casting process will be too difficult.
The casting cost is too high, and the shaping efficiency of cast steel is too low; generally, iron is used for casting while steel is forged