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Laser cladding and manual arc welding combined repairing method for abraded TRT hub

A technology of manual arc welding and laser cladding, applied in laser welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of long construction period, difficult gap size control, and difficult deformation control

Inactive Publication Date: 2018-03-20
河北瑞兆激光再制造技术股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Usually, repairing the damage of blast furnace residual pressure gas turbine expander (referred to as TRT) mainly adopts arc welding and ordinary welding repair methods. The defects of conventional repair methods are: 1. Long construction period
2. Hardness and wear resistance are difficult to meet the standard
3. The amount of deformation is not easy to control
4. It is difficult to control the gap size after repair
5. Poor corrosion resistance
and prone to cracks

Method used

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with specific embodiments.

[0044] A repair method combining laser cladding and manual arc welding after TRT hub wear, the specific operation steps are as follows:

[0045] The first step: preparation before laser cladding

[0046] A substrate surface pretreatment

[0047] (1) Degrease and sandblast the sprayed surface;

[0048] The surface of the substrate is often flame sprayed or plasma sprayed, so degreasing and sandblasting are required.

[0049] Degreasing is generally done by heating. The surface of the base material of the machine is heated to about 300-450°C. Degreasing: You can also use cleaning agents to remove oil. Commonly used cleaning agents include lye, trichloroethylene, and dichloroethylene.

[0050] Sandblasting is to remove the rust on the surface of the substrate, which is conducive to the adhesion of sandblasting powder.

[0051] Parts that have undergone surface pretreatment...

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Abstract

Disclosed is a laser cladding and manual arc welding combined repairing method for an abraded TRT hub. The method includes the six steps of preparation before laser cladding, research of crack problems during cladding, determining of cladding materials, laser cladding, manual welding of the TRT rotor hub, heat treatment, detection and machining. Iron-based self-fluxing alloy powder nickel-boron-silicon alloy serves as the cladding materials. The abraded TRT hub is repaired through the process combining manual arc welding and laser cladding, the repaired TRT hub is free of cracks and high in rate of fusing with raw materials, the abrasion resistance, corrosion resistance and comprehensive mechanical performance of the repaired TRT hub all reach or are higher than those of base metal, and the service life is greatly prolonged. The abrasion resistance of the repaired TRT hub is 1.3-1.5 times that of the raw materials, the corrosion resistance of the repaired TRT hub is 1.5-1.8 times thatof the raw materials, and the service life of the repaired TRT hub is 1.2-1.4 times that of the raw materials. The deformation amount can be controlled within 0.5 mm, meanwhile, heat damage to the base metal is quite small, and the overall mechanical performance is not lower than that of new products.

Description

technical field [0001] The invention relates to a laser cladding repair method in the field of mechanical repair, in particular to a repair method combining laser cladding and manual arc welding after the wheel hub of a blast furnace residual pressure gas turbine expander (TRT for short) is worn. Background technique [0002] Usually, arc welding and ordinary welding are used to repair the wheel hub of blast furnace residual pressure gas turbine expander (abbreviated as TRT). The defects of conventional repair methods are: 1. Long construction period. 2. Hardness and wear resistance are difficult to meet the standards. 3. The amount of deformation is not easy to control. 4. It is difficult to control the gap size after repair. 5. Poor corrosion resistance. And prone to cracks. Contents of the invention [0003] In order to overcome many defects in the prior art and solve the problems existing in conventional repair methods, the purpose of the present invention is to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/348B23K26/60B23K26/342
CPCB23K26/342B23K26/348B23K26/60
Inventor 郭树阁王洁刘雅天
Owner 河北瑞兆激光再制造技术股份有限公司
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