A Construction Technology for Preventing Welding Cracks of Water-cooled Wall Tubes

A technology of water-cooled wall pipes and construction techniques, which is applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems of poor water-cooled wall operation conditions, large welding stress, large alternating stress, etc., and achieve the elimination of restraint stress, The effect of reducing welding stress and eliminating weak links
CN112192083BActive Publication Date: 2022-05-17国家能源集团谏壁发电厂 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
国家能源集团谏壁发电厂
Publication Date
2022-05-17

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Abstract

The invention relates to a construction technique for preventing cracks at the welding joint of a water-cooled wall tube, and belongs to the technical field of welding techniques. Adopting the construction technology for preventing cracks in the welded joints of water-cooled wall pipes provided by the invention can overcome the poor welding performance of T23 materials and the problems of high sensitivity to cracks, and eliminate the restraint stress existing in the water-cooled wall structure itself. At the same time, the welding technology of the invention can be installed on site During construction, the welding preheating and heat treatment are in place to reduce the welding stress, so that the hardness of the T23 weld is reduced, the weak link at the weld fusion line is eliminated, and cracks are not easy to occur. Variable stress, due to the improvement of the construction technology during the load change of the unit, there will be no large stress to crack the pipe, and it has broad application prospects.
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Description

technical field

[0001] The invention relates to a construction technique for preventing cracks at the welding joint of a water-cooled wall tube, and belongs to the technical field of welding techniques. Background technique

[0002] Taking Jianbi Power Plant of National Energy Group as an example (hereinafter referred to as Jianbi Power Plant), during the maintenance of the #13 furnace in the seventh phase in recent years, the factory took a large-scale photograph of the 73-meter T23 water-cooled wall pipe weld, and the results showed that , it can be seen that the defect rate of suspected cracks has reached 2.96%, and these weld joints suspected of cracks, after being heated and expanded in the hot state, even if one leaks, it may cause non-stop accidents of the unit and seriously affect the safety of the unit Completion of production and non-stop targets.

[0003] The commonly used method at present: Since the motor of the reduction box of the air preheater is always in a...

Claims

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