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Manual Arc Welding Repair Method for Worn Impeller Blades of Centrifugal Fan

A manual arc welding and impeller blade technology, applied in arc welding equipment, manufacturing tools, welding equipment, etc., can solve problems such as cracks, fusion rate of cladding layer and blade base material, impeller deformation, poor wear resistance, etc.

Active Publication Date: 2015-12-02
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

[0038] The first step, preparation before repair: Disassemble and disassemble the centrifugal fan equipment numbered RZ-LF011 to be repaired, mark it, use high-pressure water gun to clean the workpiece, and clean the dust, oil, rust, etc. on the impeller blades of the centrifugal fan. After cleaning, check the size of each part to determine the damaged part of the impeller blade and the amount of wear. Perform radial and end face beats on the centrifugal fan as a whole to detect whether there is deformation. Carry out failure analysis and life evaluation of the workpiece, formulate repair process according to the repair content, etc. According to the damage situation, remove the fatigue layer 2mm from the damaged part until a new processed surface appears. Detect the material and hardness of the base material of the bearing seat, and confirm that the base material of the bearing seat is martensitic stainless steel.

[0039] The second step, in the repair process: according t...

Embodiment 2

[0044] 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 deal with the dust, oil, rust, etc. on the impeller blades of the centrifugal fan , After cleaning, check the size of each part to determine the damaged part of the impeller blade and the amount of wear. Perform radial and end face beats on the centrifugal fan as a whole to detect whether there is deformation. Carry out failure analysis and life evaluation of the workpiece, formulate repair process according to the repair content, etc. According to the damage situation, the fatigue layer was removed by 0.5 mm from the damaged part, and a new processed surface appeared. Detect the material and hardness of the base material of the bearing seat, and confirm that the base material of the bearing seat is martensitic stainless steel.

[0045] The second step, in the repair ...

Embodiment 3

[0050] 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 deal with the dust, oil, rust, etc. on the impeller blades of the centrifugal fan , Detect the size of each part, and determine the damaged part of the impeller blade and its wear amount. Perform radial and end face beats on the centrifugal fan as a whole to detect whether there is deformation. Carry out failure analysis and life evaluation of the workpiece, formulate the repair process according to the repair content; according to the damage situation, remove the fatigue layer of 1.5mm from the damaged part, and a new processed surface appears. Detect the material and hardness of the base material of the bearing seat, and confirm that the base material of the bearing seat is martensitic stainless steel.

[0051] The second step is in the repair process: according to ...

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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 reso...

Claims

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Application Information

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Patent Type & Authority Patents(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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