The large rotating shafts of various rotating machinery such as water pumps, fans, coal mills, etc. in thermal power plants and the large rotating shafts of electric motors are generally made of 40Cr, 40CrNi, 34CrMo, 0Cr13Mo and other low alloy steels and alloy steels. Made of carbon steel. During the operation of these rotating shafts, journal wear often occurs. A power plant repaired the rotating shafts with serious wear and achieved good results.
1. Before surfacing, the paint, rust and other contaminants on the surfacing area should be cleaned up, showing a metallic luster. The non-surfacing part is wrapped with asbestos rope to maintain the roughness of the original rotating shaft. The surfacing part of the surfacing front axle is heated to 200 degrees by induction heating or oxyacetylene flame.
2. According to the material of the original rotating shaft, Hunan WISE New Material Technology Co., Ltd.. uses different types of special high-entropy alloy spray welding powder for surfacing welding. After the bottom welding, the wear-resistant welding is performed.
3. In order to prevent the warpage of the shaft during surfacing, two measures are generally adopted: one is to use the balance deformation method to make the rotating shaft rotate and surfacing; the other is to erect the shaft and use the straight-line transport method or the oblique line to transport strip welding method.
4. The thickness of the surfacing layer is generally left at a processing allowance of 3mm. After welding, proper cooling and tempering are performed according to the material situation, and the stainless steel rotating shaft does not require any treatment.
The drive shaft repaired by surfacing can generally be used for more than 3 years if the mechanical parts are adjusted and operated normally.