If the volute of a submersible pump is cracked, can it be repaired by welding? Is there any other way?
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The unit has a 14-inch submersible sewage pump; the volute is cracked, and part of the outlet section along with part of the volute has fallen off. Because it has been purchased for several years, the manufacturer can no longer supply the volute, while all other parts of the pump are in good condition. Can it be repaired using welding? The volute material is cast iron. Previously, I encountered a situation where the corners at the base of a centrifugal pump were broken during loading and unloading; after grinding them, they were welded back together. But the shape of the volute is a bit more complex, and the volute is also subjected to pressure when the pump is in operation; I’m not sure whether it’s possible to repair it using welding Are there any other methods?
It should work, but it’s still recommended to buy a new one.
The cracked seam can still be welded together; but if it’s broken in two, it’s better to give up
The strength of the weld can reach or exceed that of the base material. The deformation can be corrected through welding followed by further machining. As for whether it’s cost-effective, it’s up to you to decide
I have encountered cases of volute cracking in practice, and welding it from the outside does not affect its functionality.
Calculate the costs yourself: the deformation and reshaping, plus welding; if the length is large, consider whether the cost is worth it‘
Welding cast iron still requires skill, and heat treatment is needed after welding. This will then ensure the quality of welding; otherwise, the welded area is prone to brittle cracking. It’s necessary to ask the welder whether they are willing to take on this task.