Erosion wear resistance to high temperature and high pressure pump impeller repair methods

Resistance to high temperature and high pressure water pump in the process of long-term use, sediment, water washing, medium corrosion, high temperature and high pressure pump impeller will gradually wear and corrosion damage. Blade surface often form grooves or streaks, or by the cavitation erosion damage, blade honeycomb holes, even perforation. If the blade castings with porosity, sand holes, or slag, run after surface prone to porosity, even crack.

resistance to high temperature and high pressure of the water pump impeller repair methods, there are all kinds of using ARC macromolecular composite material such as coating, powder coating ( Welding) , epoxy resin coating, rubber, nylon composite repair, etc. , and stainless steel Mosaic, welding, etc. Using epoxy resin polymer coating protection has the advantages of simple construction method, low cost, and good effect. Common repair method has the following five ways:

1.

copper wire repair method for pinhole cavitation, as long as the hole is not connected and available copper wire pinhole, beating with file file up. To use polishing machine to clear first before processing blade surface rust, dirt, and then use a oxygen acetylene flame blow within the pores of sundry, to fill the right thickness of copper wire inside, at the same time with a hammer percussion, the copper wire extrusion, crowded actually realized in the hole, with file file finally.

2, welding repair method

impeller on charcoal fire heated to 400 - 500 ℃, hanging tin in repair welding place, then the brass wire with a oxygen acetylene flame melt into the groove or holes in need of repair, welding over backwards to coals, cover insulation with asbestos board, let the blade slowly cooling, lest produce crack. After weld repairs with file according to the processing of the original contours of dressing. Quick repair steel

3

crash before steel is a kind of curing for cement bonding repairing adhesive, after curing of high strength, high hardness, contractive, not rust, suitable for steel, iron and other metal materials in the place such as porosity, crack, sand holes filling and repairing, strong bonding effect. Before the repair, will be to mend the floating around clean up the rust, dirt, etc, and roughness. Removed the crash steel plastic pipe in the colloid, colloid and cortical two different colors of inner core material by hand quickly fully amalgamated into color ( About 1 ~ 2 min) To achieve soft fever as well. Before the crash colloid to steel solidification, forcibly glued down to repair, and with the colloid solidification process (hard Hands or tools) Compaction for many times, strengthen the glue and adhesive force of the blade. After crash steel hardening, use file file.

4, epoxy resin repair

take a suitable amount of epoxy resin in the mixture ratio, order, ethylenediamine, phthalic acid dibutyl, acetone in glassware as mixture, mix well. Stir when the viscosity of note adhesives, moderate dosage of adding acetone. Make good epoxy resin had better be in 20 - Finished within 30 minutes. Brush with wool brush dipped in epoxy resin, coated blade surface sand holes, hole, when the brush gently with sharp sand holes, porosity in the middle of the bubble, as far as possible with TuShi, compaction leveling gently with the scraper at the same time. 1 - with epoxy resin 2 h after curing, and then brush 2 ~ 3 times. The last time brushing, be sure to make the blade smooth surface smooth. After the coating, the impeller in the 20 - 30 ℃ and relative humidity lower environment, slowly curing 48 h. After the epoxy resin cured with file or polishing machine impeller contour line and bumps on the surface finishing.

5, surfacing welding repair method

before welding, use grinder grinding cavitation erosion area, clean the surface rust, sundry, until bright metal on ontology, so that the surfacing layer is combined with blade more solid. After cleaning, the impeller in the fire of coals preheated. Using the same electrode or stainless steel electrode and blade material, or peeling, not damaged, dry, remove moisture, lest surfacing of porosity. When welding, welding, back and forth to take also can adopt layered cross bonding, each welding quantity is less, prevent blade heat concentration, the deformation and stress. After repair welding, use polishing machine to trimming blade. After repair of the impeller, static balance test must be conducted. To avoid high-speed rotating impeller, due to the imbalance of the additional weight to produce centrifugal force result in vibration of the pump.

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