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Turbine cylinder block sealing surface repairing process

A sealing surface and steam turbine technology, applied in the field of steam turbines, can solve the problems of difficult transportation, troublesome disassembly of steam turbines, etc., and achieve the effects of small splash, easy portability and low heat.

Inactive Publication Date: 2019-04-09
浙江翰德圣智能再制造技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a steam turbine cylinder sealing surface repair process, which solves the troublesome disassembly of the steam turbine and difficult transportation, and can quickly repair the steam turbine cylinder sealing surface in a short time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048]Abrasion and cavitation on the surface of a steam turbine cylinder in a chemical plant. The material of the steam turbine cylinder is 25MnG. There are 12 flat sealing positions (total 12) and 1 arc sealing position in the wear position. Through cold metal transition (CMT) welding, nickel-based alloy (Ni-Cr-Mo) welding wire, adjust CMT welding parameters: welding height 2.5 ~ 3mm, welding width 8 ~ 10mm, shielding gas: 98% argon and argon by volume Mixed gas of 2% carbon dioxide, welding current 180A, welding speed 10mm / s, welding bead overlap 55%, welding wire diameter 1.2mm, additive manufacturing is carried out on the wear and tear repair position, after welding, there is no crack after coloring flaw detection, stomata.

[0049] Heat the cylinder body to 150°C before welding, keep warm and cool slowly after welding, the cooling rate is 5°C / min~10°C / min, carry out coloring inspection after welding, pay attention to heat control to prevent deformation, minimize welding d...

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Abstract

The invention relates to the field of steam turbines, in particular to a turbine cylinder block sealing surface repairing process. According to the turbine cylinder block sealing surface repairing process, adopted cold metal transition (CMT) welding is an MIG / MAG additive manufacturing technique, and the process is used for repairing the turbine cylinder block sealing surface. According to turbinecylinder block materials including P265GH and medium high temperature and high pressure steam, Ni-based alloy welding wire Ni-Cr-Mo is selected as an additive manufacturing material. According to theturbine cylinder block sealing surface repairing process, cold metal transition (CMT) additive manufacturing is used for repairing the sealing surface, operation is easy, the efficiency is high, andthe bonding force is better.

Description

technical field [0001] The invention relates to the field of steam turbines, in particular to a process for repairing the sealing surface of a cylinder body of a steam turbine. Background technique [0002] Steam turbines are widely used in the fields of thermal power generation and nuclear power generation. It should be considered that the transportation of the steam turbine cylinder is inconvenient, the construction period is tight, the sealing surface is severely corroded, the overall disassembly is not easy, the replacement cycle of a set is relatively long, and the price is very expensive, so choose online The method of repair achieves the purpose of cost saving. [0003] The main forms and causes of cavitation on the sealing surface of the steam turbine block are as follows: [0004] (1) The deposits attached to the surface of the cylinder will chemically corrode the cylinder, so the later operation will cause different degrees of corrosion of the steel catalyst. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00
CPCB23P6/00
Inventor 高超超林慧超林上红
Owner 浙江翰德圣智能再制造技术有限公司
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