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Welding process for prepressing stress bimetal centrifugal casting composite pipe end flange

A technology of centrifugal casting and pre-compression stress, applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve the problems of separation and cracking of bimetallic layers, and achieve the effect of enhancing compressive stress

Active Publication Date: 2017-09-19
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of separation or cracking between the bimetallic layers caused by the residual stress of the joint in the existing bimetallic centrifugal casting composite pipe end flange welding process, aiming to provide a new type of precompressed stress bimetallic centrifugal casting composite Pipe end flange welding process

Method used

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  • Welding process for prepressing stress bimetal centrifugal casting composite pipe end flange
  • Welding process for prepressing stress bimetal centrifugal casting composite pipe end flange
  • Welding process for prepressing stress bimetal centrifugal casting composite pipe end flange

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Embodiment Construction

[0039] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0040] The prestressed bimetallic centrifugal casting composite pipe is composed of a high chromium cast iron inner layer and a stainless steel outer layer. The flange material is 20 steel. The welding position is shown in figure 1 . In the figure, prestressed bimetallic centrifugal casting composite pipe 1, flange 2, annular fillet weld 3, welding process of prestressed bimetallic centrifugal casting composite pipe end flange The specific welding process is as follows:

[0041] 1. Calculation of the theoretical preheating temperature of the flange: use the following formula to calculate the theoretical preheating problem T of the flange:

[0042]

[0043] In the formula, μ——stiffness coefficient;

[0044] D - the inner diameter of the flange;

[0045] alpha 1 - thermal expansion coefficient of stainless steel;

[0046] alpha 2 - ...

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Abstract

The invention discloses a welding process for a prepressing stress bimetal centrifugal casting composite pipe end flange. The welding process comprises the following steps that a groove is formed in the welding face of the flange, and the flange is preheated evenly before welding and is heated to a certain temperature; then the flange is installed at the end of a bimetal centrifugal casting composite pipe, and the flange is fixed to the bimetal centrifugal casting composite pipe in a spot welding mode; and then the flange and the bimetal composite pipe are connected through circular welding. The flange welded by the welding process can form certain pressure stress on the composite pipe, thus the problem of interlaminar separation of the composite pipe due to welding residual stress after welding of the bimetal composite pipe end flange can be avoided effectively, and the reliability of a connector of the double-layer bimetal centrifugal casting composite pipe end flange is improved greatly.

Description

technical field [0001] The invention relates to the technical field of preparation of special metal pipes, in particular to a flange welding process at the end of a precompressed stress bimetallic centrifugal casting composite pipe. Background technique [0002] Prestressed bimetallic centrifugal casting composite pipe is widely used in dredging, sand mining, mining, cement and other industries, and is a special metal pipe that has developed rapidly in recent years. Usually, the inner layer of the bimetallic centrifugal casting composite pipe is composed of high-chromium cast iron with high wear resistance and corrosion resistance, which is relatively brittle and hard; while the outer layer is composed of stainless steel or low-carbon steel with high strength and toughness. . The inner and outer layers of this heterogeneous bimetallic composite pipe usually have some inclusions generated during the centrifugal casting process, which makes the bonding performance of the inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02
CPCB23K31/027
Inventor 杜学铭陈浠迪汪选国胡建华彭军波李佳琪
Owner WUHAN UNIV OF TECH
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