Pump shaft repair
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The pump shaft of a regular pump is worn and requires welding; what kind of welding material is needed? Urgently
Generally, shafts have high strength; they are made of high-carbon steel or forged round bars. Therefore, welding rods used for repair must be high-carbon steel welding rods
If the shaft is too small, just replace it; simple welding repair is likely not sufficient. Generally, if the shaft diameter is relatively large, it can be surfaced by welding, then planed on a lathe, chrome-plated, and finally turned on a lathe to achieve the desired diameter.
It is recommended to replace the shafts that are smaller in size; welding can easily cause deformation, especially in those with a relatively thin diameter – in such cases, they can be discarded outright. For those with a larger shaft diameter, surfacing can be considered; for applications requiring high precision, spraying can be used, and finally the part is processed on lathes and grinders
The repaired pump shaft does not perform well; the costs outweigh the benefits
This post was last edited by qwl on 2016-11-21 at 10:28. A low rotational speed and a small bearing diameter mean that, with a low load, intermittent welding in a symmetrical strip pattern can be used; however, if full welding is employed without heat treatment, it cannot be used. Using it will cause accidents or serious incidents. Conditioned nickel plating, hard Cr.
Don’t try to weld and repair it yourself; it’s very troublesome to round it off and align it properly
This post was last edited by ddfmy on 2016-11-25 at 20:23: 1. Clean the oil stains from the surface； 2. Heat the welding area to around 300 degrees using the flame of an oxy-acetylene welder ； 3. Use J507 welding rod with a diameter of 3.2; preheat it at 350 degrees for 1 hour first, then place it in an insulated container for easy access at any time ； 4. Direct current should be used during surfacing, with positive polarity and a short arc; welding should be carried out symmetrically along the axial direction in narrow strips (symmetric welding is used to reduce deformation). After welding, a margin of 3 to 5 millimeters should be left to facilitate machining ； 5. After the surfacing is completed, cover it with dry ash (this is very important; otherwise the piece won’t move), and then remove it once it has reached room temperature to carry out turning operations to achieve the desired dimensions.