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T23 water-cooling wall field repair method based on surfacing technology

A repair method and water-cooled wall technology, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problems of difficult tube replacement welding, difficult operation, slow progress, etc., to avoid micro-cracks in weld bead, avoid arc welding Pit cracks, maintenance time reduction effect

Pending Publication Date: 2021-03-12
国家能源集团谏壁发电厂 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It not only consumes a lot of manpower and material resources, but also the tube replacement welding is difficult and the progress is slow
[0003] Many membrane water wall pipes use T23 steel (07Cr2MoW2VNbB). T23 steel has a tendency of cold cracking and a very obvious tendency of reheating cracks. During butt welding, pre-weld preheating and post-weld heat treatment are required, which is difficult to operate. implement

Method used

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  • T23 water-cooling wall field repair method based on surfacing technology
  • T23 water-cooling wall field repair method based on surfacing technology
  • T23 water-cooling wall field repair method based on surfacing technology

Examples

Experimental program
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Effect test

Embodiment 1

[0016] An on-site repair method for T23 water wall based on surfacing technology: using manual GTAW surfacing method to surfacing welding wire on the surface of the damaged pipe. There are 3 layers, so that the thickness of the surfacing layer is basically equal to the thickness of the water-cooled wall pipe. The operation schematic diagram is attached figure 1 As shown, the surfacing welding operation process is:

[0017] The tungsten electrode extension length is 5mm, the arc length control range is 2.5mm, the current is 120A, the welding speed is 70mm / min, the voltage is 15V, the shielding gas flow rate is 15L / min, the interlayer temperature is controlled within 150°C, the arc extinguishing time of manual welding is 5s, and the welding The heat input value is 5.6kJ / cm.

[0018] The effect after surfacing welding is as attached Figures 3 to 4 As shown, observe the structure of each area of ​​the surfacing joint under a metallographic microscope, figure 2 Among them, the...

Embodiment 2

[0028] Increase the thickness of the surfacing layer until the surfacing layer is 5 layers, and the rest of the process operations are the same as in embodiment 1. After the surfacing is completed, according to the standard GB / T 31310-2014 "Metal Material Residual Stress Measurement Drilling Strain Method", the small hole release method (blind hole method) is used to measure the residual stress of the newly added nickel-based surfacing layer, as shown in the table 3 shows:

[0029] table 3

[0030] Overlay Residual stress, MPa layer 4 -268.0 layer 5 -271.0

[0031] It can be seen that when the thickness of the surfacing layer basically reaches the thickness of the water-cooled wall pipe (three-layer surfacing layer in this application), the contribution to the compressive stress of the water-cooled wall pipe is also very limited if the thickness of the surfacing layer is continued to increase. Therefore, the three-layer surfacing layer in this sch...

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Abstract

The invention belongs to the technical field of water-cooling wall repair, and particularly relates to a T23 water-cooling wall field repair method based on a surfacing technology. A pipeline with defects is reinforced by increasing the wall thickness, and expected welding residual stress fields are formed inside a pipeline by surfacing, so that expansion of the original defects and generation ofnew defects are prevented; and preheating is not needed before welding, and thermal treatment is not needed either after welding.

Description

technical field [0001] The invention belongs to the technical field of water-cooled wall repair, in particular to a method for on-site repair of a T23 water-cooled wall based on surfacing technology. Background technique [0002] In the field of thermal power plants, the boiler generally adopts a membrane-type water-cooled wall structure (height exceeds 50 meters, width exceeds 30 meters, welded by water-cooled pipes and fins), and the combustion of coal powder is used to heat the water in the water-cooled wall. The high-temperature and high-pressure steam drives the steam turbine to rotate, which in turn drives the generator to generate electricity. During the operation of the unit, the surface of the water-cooled wall is affected by high-temperature flue gas corrosion, surface scaling (slagging), etc., resulting in thinning of the water-cooled wall or cracks on the surface. The unit operates safely. At present, the welding maintenance of water wall pipes generally adopts...

Claims

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Application Information

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IPC IPC(8): B23K9/04B23K9/32B23K101/06
CPCB23K9/048B23K9/32B23K2101/06
Inventor 石祥文鲁立丁永三杨佳黄俊徐忠峰吕一仕
Owner 国家能源集团谏壁发电厂
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