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An improved mechanically welded butt joint groove of dissimilar steel pipes

An improved technology for butt joints, applied to the edge of workpieces, metal processing equipment, manufacturing tools, etc., can solve the problems of large amount of corrosion, burst pipes, etc., and achieve the effect of simple groove processing

Active Publication Date: 2012-02-01
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nickel content of the root of the butt weld of this groove type is generally lower than 40%, and the nickel content of the root of the dissimilar steel butt joint weld is lower than 40%, which will cause the corrosion of this part to be greater than that of other parts during the operation of the boiler, making the pipe at this place The thinning of the wall thickness is greater than that of other parts, which brings the possibility of tube explosion

Method used

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  • An improved mechanically welded butt joint groove of dissimilar steel pipes
  • An improved mechanically welded butt joint groove of dissimilar steel pipes

Examples

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Effect test

Embodiment 1

[0011] Such as figure 1 As shown, it is a structural schematic diagram of an improved dissimilar steel pipe mechanically welded butt joint groove provided by the present invention. There is a groove with an angle α on the stainless steel pipe 1 side and the high-alloy heat-resistant steel pipe 2, and on the stainless steel pipe 1 side There is a boss with a length a and a thickness b, and a boss with a length c and a thickness b on the 2 sides of the high-alloy heat-resistant steel pipe, where 0≤c<a. Wherein, the length a is 3.5 mm, the thickness b is 1.5 mm, the length c is 1.5 mm, and the angle α is 7°.

[0012] When implementing the present invention, the asymmetric bevel is firstly machined with a corresponding custom-made tool or a machining lathe. Then mechanical welding is adopted, and before welding, it is confirmed that the surface of the base metal meets the welding requirements, and there is no gap between the counterparts. Finally, certain welding process paramet...

Embodiment 2

[0014] The structure of this embodiment is the same as that of Embodiment 1, except that the length a is 5 mm, the thickness b is 1.4 mm, the length c is 0, and the angle α is 10°.

Embodiment 3

[0016] The structure of this embodiment is the same as that of Embodiment 1, except that the length a is 3 mm, the thickness b is 1 mm, the length c is 2, and the angle α is 5°.

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Abstract

The invention provides an improved groove of mechanically welded butt joint of dissimilar steel pipes, which has an angle α on the side of the stainless steel pipe and the high-alloy heat-resistant steel pipe, and is characterized in that the stainless steel pipe has a length of a, A boss with a thickness of b has a boss with a length of c and a thickness of b on the side of the high-alloy heat-resistant steel pipe, where 0≤c<a. The invention has the advantages that: the nickel content at the root of the weld can reach more than 40% by cooperating with certain welding process parameters; the mechanical properties of the weld and other aspects of performance are the same as those of the general groove butt weld; the groove processing is simple and convenient, It can be formed by machining with a lathe or making a corresponding tool for one-time chamfering.

Description

technical field [0001] The invention relates to an improved mechanically welded butt joint groove of dissimilar steel pipes, which is used for mechanically butt welded high alloy heat-resistant steel pipes and stainless steel pipes. Background technique [0002] The butt joint groove of high-alloy heat-resistant steel pipe and stainless steel pipe generally adopts a certain angle and symmetrical groove type. The nickel content of the root of the butt weld of this groove type is generally lower than 40%, and the nickel content of the root of the dissimilar steel butt joint weld is lower than 40%, which will cause the corrosion of this part to be greater than that of other parts during the operation of the boiler, making the pipe at this place The thinning of the wall thickness is greater than that of other parts, which brings the possibility of tube explosion. Contents of the invention [0003] The purpose of the present invention is to provide a butt joint groove which ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K33/00
Inventor 孙旭东傅育文
Owner SHANGHAI BOILER WORKS
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