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Surfacing method, repairing system and repairing method for stellite alloy of porous sliding surface of steam turbine valve element

A sliding surface and steam turbine technology, applied in welding equipment, metal processing equipment, plasma welding equipment, etc., can solve the problems of stellite alloy layer cracking, low welding efficiency, and scrapped valve core parts, so as to improve convenience and increase The effect of reducing the workload and reducing the pressure on the machine tool

Active Publication Date: 2022-03-25
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the high hardness of the alloy after Stellite surfacing welding, the drilling process will often lead to the cracking of the Stellite alloy layer, resulting in the scrapping of the valve core parts, and the technical problems of low welding efficiency, the invention provides a new steam turbine Overlay welding method and repair system of Stellite alloy on porous sliding surface of valve core

Method used

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  • Surfacing method, repairing system and repairing method for stellite alloy of porous sliding surface of steam turbine valve element
  • Surfacing method, repairing system and repairing method for stellite alloy of porous sliding surface of steam turbine valve element
  • Surfacing method, repairing system and repairing method for stellite alloy of porous sliding surface of steam turbine valve element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Embodiment 1, see attached figure 1 :

[0067] A repair method for Stellite surfacing:

[0068] Overlay welding of new product valve core parts (exhaust and exhaust holes are evenly distributed around the large inner hole of Stellite to be surfacing, and obliquely intersect with the large inner hole of valve core surfacing) The method includes pre-processing T-shaped plugs 2 , the plug 2 is specifically T-shaped, the right side L right of the big end of the plug 2 is greater than the left end L left, the edge height h of the plug 2 > the surfacing thickness δ, the height of H is determined by the process, the surface of the big end of the plug 2 is a spherical surface, See figure 1 shown. The diameter of the small end of the plug 2 is smaller than the diameter of the exhaust hole 1, and the number of plugs is prepared according to the number of holes.

[0069] The repair system of the present invention includes: powder plasma surfacing equipment with arc voltage adj...

Embodiment 2

[0080] Example 2, see figure 2 , image 3 :

[0081] Another repair method of Stellite surfacing:

[0082] Powder plasma welding machines without (or without) arc voltage regulators, plugs, workpieces, grinding tools, etc.

[0083] 1) Plug preparation: Prepare the plug 1 according to the valve disc, the plug H is determined according to the process, and the left and right dimensions of L are determined according to the process requirements. Finally, prepare a number of plugs of the same material as the valve core parts according to the plug processing technology. The schematic diagram of the valve core is figure 2 , image 3 .

[0084] 2) Inspection of valve core components: Clean up the assembly area of ​​the plug, and PT detect that there is no defect in the assembly portion of the plug.

[0085] 3) Install welding plug 2: Since the exhaust hole 1 is inclined to intersect with the surface of the surfacing inner hole, the plug 2 is installed as follows: figure 2 , ...

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Abstract

The invention discloses a stellite surfacing method for a multi-hole sliding surface of a valve core, which comprises the following steps: a to-be-surfaced surface of an inner hole of the valve core is divided into a plug area and a non-plug area in advance, the plug area is a to-be-surfaced exhaust hole area, the plug area is provided with a plug for plugging an exhaust hole / exhaust hole, and the non-plug area is provided with a plug for plugging the exhaust hole / exhaust hole; the plug is provided with a large end and a small end; before stellite surfacing is carried out on a plug area, a welding material which is the same as a valve element component or resistant to high temperature oxidation is used for completing the steps of spot welding, firm fixing and fillet weld polishing and smooth transition; performing stellite surfacing on the plug area and the non-plug area of the surface to be surfaced; and after stellite surfacing, turning the choke plug area, turning the large end of the T-shaped choke plug, and exposing the large end of the choke plug out of the cleaned outline. The method can be used for stellite surface surfacing or repairing of valve element components of units such as nuclear power steam turbines, thermal power steam turbines and industrial turbines.

Description

technical field [0001] The invention belongs to the technical field of Stellite surfacing or repairing of steam turbine valve core parts, and relates to a Stellite alloy surfacing method and repair system on the porous sliding surface of a steam turbine valve core. The invention is applicable to nuclear power steam turbines, Stellite surface overlay welding method and repair system for valve core components of thermal power steam turbines, industrial turbines and other units. Background technique [0002] At present, for the development trend of "three highs" (temperature, pressure, power) with higher and higher parameters of steam turbines, the temperature borne by valve core parts is gradually rising from 560 °C. The protection of the material has also shifted from the nitriding of the friction pair of the valve core to a higher level of Stellite alloy surface modification to improve the high temperature friction and oxidation resistance of the friction surface of the valv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K10/02B23P6/00
CPCB23K10/027B23P6/00Y02E30/30
Inventor 陈兴东熊建坤赵鹏飞许德星杨建平杨林黄滔郭洋张海波毕涛张红涛
Owner DONGFANG TURBINE CO LTD