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Welding method of high temperature and high pressure bellows globe valve

A corrugated pipe stop valve and welding method technology, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problems of high fatigue resistance, affecting the fatigue resistance of weld seams, fast heat conduction, etc., and achieve the improvement of elastic fatigue strength and service life, preventing the generation of local fine oxides, ensuring the effect of quality and fatigue resistance

Active Publication Date: 2017-03-15
JIANGSU XINGHE VALVE +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the metal bellows must be both pressure-resistant and elastic, and it is composed of multiple layers of precision thin-walled seamless pipes overlapping, it needs to be welded and sealed with the valve stem or valve core and flange with thin walls, many layers, and volume. Small size, narrow welding surface, large force, high fatigue strength, etc., the process is difficult; In addition, the welding of the flange and the bonnet, and the welding of the bonnet and the valve body, due to the high welding temperature, fast heat conduction, and the welding position and metal The closeness of the weld seam of the bellows is likely to cause local oxidation of the weld seam of the metal bellows to produce fine oxides, thereby affecting the fatigue strength of the weld

Method used

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  • Welding method of high temperature and high pressure bellows globe valve
  • Welding method of high temperature and high pressure bellows globe valve
  • Welding method of high temperature and high pressure bellows globe valve

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] 1. A welding method for a high-temperature and high-pressure corrugated pipe stop valve, which consists of a DC argon arc welding machine, a circular seam automatic welding machine, an Ar gas cylinder, a regulating valve, a pressure gauge, a glass rotameter, a soft rubber hose, an electromagnetic reversing valve, Composed of pipe joints, solder, etc., characterized in that: DC argon arc welding machine and circular seam automatic welding machine are connected well, regulating valve, pressure gauge, glass rotameter and soft rubber tube are installed on the Ar gas cylinder; the soft rubber tube is divided into A , B two roads, A road is the Ar shielding gas pipe directly connected to the DC argon arc welding machine; B road is the back shielding gas pipe connected to another regulating valve and glass rotameter, and then connected to the welding mac...

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Abstract

The invention aims at providing a welding method of a high-temperature and high-pressure corrugated pipe cutoff valve. The method adopts Ar (argon) double shielded welding, matching of a welding flux and a base metal, optimum combination of welding current, welding speed and welding time as well as diameter of a tungusten electrode, diameter of a spray nozzle and diameter of the welding flux, and an Ar protecting flow and control procedure. The high-temperature and high-pressure corrugated pipe cutoff valve structurally consists of a metal corrugated pipe, a valve rod or a valve core and a flange, and the valve with pressurizing shielded sealing, zero leakage and high reliability is realized by welding. The high-temperature and high-pressure corrugated pipe cutoff valve has the advantages that the metal corrugated pipe is pressure-proof and elastic, is formed by overlapping a plurality of precision thin-wall seamless pipes, and needs to be welded and sealed with the valve rod or the valve core and the flange, so the wall is thin, multiple layers are arranged, the size is small, the welding surface is narrow, the stress is large, the anti-fatigue strength is high, and the like; the welding method directly affects the quality of a welding seam and the anti-fatigue property of the metal corrugated pipe, and is closely related to the service life and reliability of the valve.

Description

technical field [0001] The invention relates to the design and manufacture of valves, which are widely used in the opening and closing and control devices of poisonous, radioactive, inflammable and explosive and other harmful media in industrial pipelines and other pipelines. Background technique [0002] The structure of the high-temperature and high-pressure bellows globe valve is a valve with metal bellows, valve stem or valve core and flange, which realizes pressure screen opening and sealing, zero leakage and high reliability through welding. Since the metal bellows must be both pressure-resistant and elastic, and it is composed of multiple layers of precision thin-walled seamless pipes overlapping, it needs to be welded and sealed with the valve stem or valve core and flange with thin walls, many layers, and volume. Small size, narrow welding surface, large force, high fatigue strength, etc., the process is difficult; In addition, the welding of the flange and the bonn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16B23K9/32
CPCB23K9/0026B23K9/028B23K9/164B23K9/167B23K9/235B23K9/325
Inventor 朱义芳
Owner JIANGSU XINGHE VALVE
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