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Method for groove welding of stainless steel on double plate butterfly valve

A butterfly valve and double-plate technology, which is applied to other manufacturing equipment/tools, manufacturing tools, etc., can solve problems such as slag inclusions and pores, affect the processing period, and workpiece deformation, so as to reduce the welding area and ensure the sealing performance , to ensure the effect of the processing period

Inactive Publication Date: 2008-10-22
SICHUAN DONGFENG ELECTRIC MACHINARY WORKS CO LTD
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AI Technical Summary

Problems solved by technology

[0007] Except for the first step of the above-mentioned traditional processing technology, other steps are not easy to ensure the processing quality of the valve body
Because the rough machining size is determined based on the thickness of the stainless steel layer on the sealing surface after finishing machining, but during the finishing process, the valve body has a large diameter and poor rigidity, resulting in excessive local surfacing welding area, increased stress, and poor welding performance. The stress is different due to the difference in speed and transport method, and there is no annealing step to eliminate it, and the process support will cause the deformation of the workpiece and cannot be used, so the deformation after welding increases. The welding process requires layer by layer welding of stainless steel. Easy to produce slag inclusions and pores
In this way, the stainless steel layer with a thickness of only 3-5mm on the sealing surface of the valve body after finishing machining often has defects between the surfacing layer and layers, delamination, and even welding off. The processing period cannot effectively guarantee the processing quality

Method used

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Embodiment Construction

[0017] The method of groove welding stainless steel for the double-plate butterfly valve body includes the following four steps:

[0018] (1) Connect to the flange used for the sealing surface of the valve body;

[0019] (2) Rough machining the sealing surface of the flange, and turning out the welding groove at the same time;

[0020] (3) Decorate the stainless steel ring in sections on the sealing surface of the flange, and perform welding and shape correction;

[0021] (4) The valve body is assembled and welded as a whole;

[0022] (5) Post-weld stress annealing treatment.

[0023] When welding, the stainless steel ring is welded in sections by groove method, and the welded valve body and the stainless steel ring welded on the sealing surface are subjected to stress relief annealing treatment at the same time.

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Abstract

A technique for welding stainless steel ring onto the bevel of the valve body of dual-plate butterfly valve features that said stainless steel ring is segmentally welded and the valve body with welded stainless steel ring is annealed, resulting in high quality and minimal deformation.

Description

technical field [0001] The invention relates to a method for groove welding stainless steel to a valve body of a double-plate butterfly valve of a hydroelectric generator. Background technique [0002] The butterfly valve, an important electromechanical device in a hydroelectric generator, is mainly used to close and protect the unit when an emergency occurs. The maintenance behavior of the unit during maintenance does not affect the operation of other units, and the water guide mechanism, runner, and flow channel are free from damage when the unit is shut down. Corroded by interstitial airflow and sediment. The butterfly valve mainly includes a valve body and a valve. The processing quality of the sealing layer of the valve body directly affects the sealing performance of the entire butterfly valve. The material of the sealing surface of the valve body is mostly made of corrosion-resistant and wear-resistant stainless steel. Made of stainless steel, the traditional process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P23/04
Inventor 严祥兵王跃辉
Owner SICHUAN DONGFENG ELECTRIC MACHINARY WORKS CO LTD
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