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Dissimilar metal welding structure and method of titanium alloy flange and stainless steel pipeline

A technology of dissimilar metals and stainless steel pipes, applied in welding equipment, metal processing equipment, edge parts of workpieces, etc., can solve the problems of direct fusion welding, metallurgical incompatibility, weld embrittlement, etc., and achieve good engineering application value. Effect

Active Publication Date: 2013-03-06
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, Ti also forms more complex intermetallic compounds and carbides with Ni, Cr, and C, which makes the weld severely embrittled and even cracks
Even in the solid state, due to the mutual diffusion and migration of base metal components, a thin layer of intermetallic compounds and carbides will be formed near the joint surface, resulting in brittle fracture of the joint
Therefore, the metallurgical incompatibility of the two materials titanium alloy and stainless steel prevents them from being directly welded

Method used

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  • Dissimilar metal welding structure and method of titanium alloy flange and stainless steel pipeline

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Embodiment 1

[0024] A welding structure of a titanium alloy flange and a stainless steel pipeline dissimilar metal according to the present invention, as attached figure 2 As shown, the inner side of the stainless steel pipeline 1 is a cone structure, and the cone angle is between 30°-50° (for example: 30°, 40° or 50°); the outside of the titanium alloy flange 2 is a cone structure, and the cone angle is between 30°-50°; The angle is the same as the cone angle of the stainless steel pipeline 1; the cone structure on the outside of the titanium alloy flange 2 is embedded in the cone structure on the inside of the stainless steel pipeline 1, and the two are matched and welded together. The titanium alloy flange 2 is welded with the storage tank body or the titanium alloy pressure vessel 3 (. The above are all TC4 titanium alloy materials.

Embodiment 2

[0026] A method for welding dissimilar metals between a titanium alloy flange and a stainless steel pipeline according to the present invention comprises the following steps:

[0027] (a) Process the inner side of the stainless steel pipeline 1 to be welded to form a cone structure, the cone angle is between 30°-50° (for example: 30°, 40° or 50°); on the titanium alloy flange 2 to be welded The outer side of the welding part is also processed to form a cone structure, and the size of the cone angle is the same as that of the stainless steel pipeline 1, so as to ensure that the cone structure on the outside of the titanium alloy flange 2 matches the cone structure on the inside of the stainless steel pipeline 1;

[0028] (b) nickel-plate the surface of the cone structure of the stainless steel pipeline 1 to be welded, and the thickness of the coating is 10-50 μm (for example: 10 μm, 30 μm or 50 μm);

[0029] (c) Clean the surface of the cone structure of the titanium alloy flan...

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Abstract

The invention provides a dissimilar metal welding structure and a dissimilar metal welding method of a titanium alloy flange and a stainless steel pipeline. A conical structure is arranged inside the stainless steel pipeline, and the cone angle is 30-50 degrees; a conical structure is arranged outside the titanium alloy flange, and the cone angle is the same as the cone angle of the stainless steel pipeline; and the conical structure outside the titanium alloy flange is embedded into the conical structure inside the stainless steel pipeline, and the two are matched and welded. By using the welding method and the welding structure, larger shrinkage is produced in a cooling process from high temperature to normal temperature since the thermal expansion coefficient of the stainless steel pipeline is higher after braze welding, and internal stress of the stainless steel pipeline for hooping the titanium alloy flange is produced, so that the reliability of the pipeline structure is increased and great engineering application value is achieved.

Description

technical field [0001] The invention relates to a connection structure and method of dissimilar metal pipelines, in particular to a structure and method for welding dissimilar metals of titanium alloy flanges and stainless steel pipelines. Background technique [0002] Welding of dissimilar metal materials is an important problem in the field of welding technology. Due to the significant differences in physical and chemical properties of dissimilar metals, the welding process is much more complicated than that of the same metal, and the quality of welded joints is difficult to guarantee. [0003] As a new type of metal material, titanium alloy has the characteristics of high specific strength (strength / density), high thermal strength, good corrosion resistance, and good low-temperature performance. It is often used as a high-pressure gas cylinder, low-temperature The material of choice for gas cylinders and corrosion-resistant piping. [0004] In order to meet the high stor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K33/00B23K1/008B23K1/20
Inventor 戴志锋梁德彬焦好军周炼刚
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH