Manual arc welding repair method for centrifugal blower after impeller blade abrasion

A technology of manual arc welding, impeller blades, applied in the direction of arc welding equipment, manufacturing tools, welding equipment, etc.

Active Publication Date: 2014-09-03
河北瑞兆激光再制造技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]The purpose of the present invention is to provide a kind of good wear resistance for the existing traditional surfacing welding technology to repair the poor wear resistance, the repair layer is easy to fall off, and contains cracks. Centrifugal fan impeller blades with strong hardness, less cracks in the repair layer, high fusion rate between cladding layer and blade base material, and small impeller deformation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The method to detect the defects on the surface of impeller blades that affect the mechanical properties of the blades is to spray a layer of red penetrant on the repaired surface of the impeller blades and wait for 10-15 minutes, then use a cleaning agent to clean the penetrant on the workpiece. Spray a layer of white developer on the surface, if there are pores, red dots will appear, and if there are cracks, red lines will appear.

[0040] Carry out heat treatment on the repaired centrifugal fan impeller to remove residual stress. The method used is to place the repaired centrifugal fan impeller in a heating furnace at a temperature of 600-650°C, and then keep it warm for 2 hours. When the temperature drops below 200°C After the oven.

[0041] Example 2:

[0042] The first step of preparation before repair: Disassemble and disassemble the centrifugal fan equipment numbered RZ-LF-0171 to be repaired, mark it, clean the workpiece with a high-pressure water gun, and dea...

Embodiment 2

[0045] The method to detect the defects on the surface of impeller blades that affect the mechanical properties of the blades is to spray a layer of red penetrant on the repaired surface of the impeller blades and wait for 10-15 minutes, then use a cleaning agent to clean the penetrant on the workpiece. Spray a layer of white developer on the surface, if there are pores, red dots will appear, and if there are cracks, red lines will appear.

[0046] Carry out heat treatment on the repaired centrifugal fan impeller to remove residual stress. The method used is to place the repaired centrifugal fan impeller in a heating furnace at a temperature of 600-650°C, and then keep it warm for 2 hours. When the temperature drops below 200°C After the oven.

[0047] Example 3:

[0048] The first step of preparation before repair: Disassemble and disassemble the centrifugal fan equipment numbered RZ-LFZ-0161 to be repaired, mark it, clean the workpiece with a high-pressure water gun, and de...

Embodiment 3

[0051] The method to detect the defects on the surface of impeller blades that affect the mechanical properties of the blades is to spray a layer of red penetrant on the repaired surface of the impeller blades and wait for 10-15 minutes, then use a cleaning agent to clean the penetrant on the workpiece. Spray a layer of white developer on the surface, if there are pores, red dots will appear, and if there are cracks, red lines will appear.

[0052] Carry out heat treatment on the repaired centrifugal fan impeller to remove residual stress. The method used is to place the repaired centrifugal fan impeller in a heating furnace at a temperature of 600-650°C, and then keep it warm for 2 hours. When the temperature drops below 200°C After the oven.

[0053] The above disclosures are only specific embodiments of the present invention, but the present invention is not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of th...

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Abstract

The invention discloses a manual arc welding repair method for a centrifugal blower after impeller blade abrasion. The method comprises a preparation step before repair and a repair step, wherein the repair method comprises the following steps: cleaning a workpiece, detecting the workpiece; disassembling a damaged impeller; analyzing the workpiece; installing a special tooling; removing a fatigue layer after the abraded part of the impeller blade is removed, and detecting a base material; selecting a welding material, and welding the repaired damaged part in manners of small current, short arc operation and symmetry welding; then carrying out destressing heat treatment, and removing residual stress; carrying out surface coloring flaw detection on the processed workpiece surface, and assembling as a whole, so as to achieve the traditional design standard of a manufacturer. The repaired part has the advantages of good abrasive resistance, large hardness, high fusion rate of a cladding layer and an impeller blade base material, small impeller deformation and the like.

Description

Technical field: [0001] The invention relates to a manual arc welding repair method in the field of mechanical repair, in particular to a manual arc welding repair method for centrifugal fan impeller blades. Background technique [0002] Due to the large erosion and wear of the centrifugal fan impeller blades during operation, and the manufacturing defects of the workpiece itself, there is stress concentration at the connection between the blade and the wheel hub, and the stress concentration is prone to damage and cracks, which gradually expand and break . At present, traditional surfacing welding technology is generally used to repair the cracks of impeller blades of centrifugal compressors. This surfacing welding repair method not only has poor wear resistance, but the repair layer is easy to fall off and still contains cracks. These defects have seriously affected the use effect of the centrifugal fan. It will cost a lot of money to replace the equipment, and waste re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/235
CPCB23K9/04B23K9/235B23P6/045
Inventor 王超薛野巍韩佳杰
Owner 河北瑞兆激光再制造技术股份有限公司
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