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Valve stress dispersion based welding method

A technology of stress dispersion and welding method, used in welding equipment, arc welding equipment, edge parts of workpieces, etc., can solve problems such as failure, and achieve the effect of weakening stress concentration, improving fatigue resistance, and reducing sharpness

Inactive Publication Date: 2014-04-30
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Based on the above deficiencies, the present invention provides a welding method based on valve stress dispersion, the purpose of which is to solve the failure problem of the valve structure caused by the stress concentration effect at the weld seam after the valve cover and valve body are welded during service

Method used

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Embodiment 1

[0029] 1. The surface of the connecting part of the valve cover and the valve body is treated in the early stage, and the surface of the lip part of the valve cover and the valve body is polished with sandpaper or a grinding wheel to ensure that the connecting surface is smooth and clean, with good machining performance and welding environment;

[0030] 2. Using the machining method of drilling, fix the valve cover and the valve body on the drilling machine, and use the drill bit to process a hemispherical opening of an appropriate size at the corresponding position of the connecting part. The diameter of the spherical opening is 2 ~ 3mm. The minimum distance between the spherical opening and the valve cover and the outer surface of the valve body is 1.5-3 mm. In the process of processing the spherical opening, the bonnet and the valve body are fixed with fixtures to avoid deformation of the bonnet and the valve body, minimize the residual stress of the bonnet and the valve bod...

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Abstract

The invention discloses a valve stress dispersion based welding method. The method comprises machining a semi-spherical opening at the corresponding positions of bonnet and valve body connection portions through a machining method on the basis of conventional bonnet and valve body welding processes respectively to form a corresponding spherical opening, wherein the size and the position of the opening is adjusted according to the valve model, utilization condition and application place particular actual conditions; performing welding connection on the bonnet and the valve body through pulse TIG welding to enable the weld joint root gap sharpness to be reduced to the minimum. According to the method, the weld joint root gap sensitivity is reduced by reducing the weld toe gap sharpness; when a valve is under the external load action, the stress concentration factor and the strain gradient at the weld toe are reduced apparently, so that the weld joint root stress concentration problem is solved, the weld joint quality and the anti-fatigue performance are improved, and the valve service life is prolonged.

Description

technical field [0001] The invention relates to welding technology, in particular to a welding method based on valve stress dispersion. Background technique [0002] At present, in engineering production, welding is the most important connection method. A large number of studies have shown that when the real stress value of the stressed component exceeds the maximum stress it can bear, crack initiation may occur, and even sudden fracture may occur. In the welded structure, the effects of welding defects, stress concentration and residual tensile stress on the weld toe of the welded joint will cause its strength limit to be much lower than that of the base metal, so the strength limit of the welded structure mainly depends on The basic mechanical properties of welded joints, that is, the tensile and compressive properties of welded joints, are related to whether the welded structure can be used safely. Therefore, in order to make the welded structure better meet the enginee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/235B23K9/00
CPCB23K9/167B23K9/235B23K33/00
Inventor 吕世雄曹志宇黄永宪徐永强郑传奇鲁传洋张秀健
Owner HARBIN INST OF TECH
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