Welding method of thick-walled closed ring

A welding method and a closed-loop technology, applied in welding equipment, welding equipment, auxiliary welding equipment, etc., can solve the problems of high processing pass rate and welding defects, and achieve the effects of convenient assembly and positioning, reducing processing costs and improving processing efficiency

Active Publication Date: 2021-12-21
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] In order to overcome the deficiency that welding defects are prone to occur when the existing closed ring and cylindrical shell workpieces are angled, the technical problem to be solved by the present invention is to provide a welding method for a thick-walled closed ring, which is not easy to form defects due to welding stress , so the processing pass rate is high

Method used

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  • Welding method of thick-walled closed ring
  • Welding method of thick-walled closed ring
  • Welding method of thick-walled closed ring

Examples

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Embodiment

[0045] Such as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 and Figure 6 As shown, the methanol synthesis tower produced by a workshop of the applicant is taken as an example. During the structural design of the tower, the skirt and the cylindrical shell are connected by welding rings. The shell and welding ring are made of SA-387GR22CL2, the outer diameter of the cylinder is about 4500mm, the thickness of the welding ring is δ70-90mm, and the width is 160mm. The welding process is as follows.

[0046] The welding ring is divided into four equal parts for blanking: divided into four arc segments 3, the two ends of the arc segment 3 are opened with a butt joint groove 6, and the form of the butt joint groove 6 is V-shaped, 20°;

[0047] Assembling the welding ring and the shell: the four arc segments 3 that make up the welding ring are assembled with the shell and fixed with a U-shaped plate, and the U-shaped plate is processed by CNC gas cutting. Each arc s...

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Abstract

The invention discloses a welding method suitable for a thick-walled closed ring in the form of a full-penetration fillet joint. The following steps are followed in turn for welding: S1. The closed ring is segmented, and the closed ring is divided into two or more arc-shaped segments. The two ends of each arc section are provided with butt joint grooves, and the welding parts of each arc section and the main body of the workpiece are provided with corner joint grooves; S2, fixed in sections, and all arc sections are fixed at the designed position by welding tooling On the workpiece body, the welding tooling is welded to the arc section and the workpiece body respectively, but there is no direct welding between the arc section and the workpiece body in this step; S3. Complete the main part of the fillet weld, and connect each arc section to the workpiece The main body is welded, but a tail section with a set length is left at both ends of each arc section without welding; S4, welding the fillet weld between the tail section and the workpiece body and welding the joints between adjacent arc sections Butt welds. When the invention is used for welding, the problem of deformation and cracking is not easy to occur, the first pass rate of welding seam flaw detection is improved, and the processing cost is reduced.

Description

technical field [0001] The invention relates to a welding process for fillet joints, in particular to a welding process for thick-walled closed rings in the form of full penetration. Background technique [0002] The skirt of the tower pressure vessel is usually connected with the cylindrical shell by welding ring design, as shown in the attached figure 1 shown. In order to ensure the bonding strength, the welding ring and the cylinder are designed as a full penetration fillet joint. The welding ring is usually designed as a closed circular workpiece with a central angle of 360°, and the welding ring has a large diameter, usually more than 2000mm, and a thick wall thickness, usually more than 50mm. Because the welding ring and the shell are made of steel plates, there is a certain ellipticity. When assembling the closed welding ring and the shell, there is a forced assembly, and the stress is large. The spot welding seam inside the groove during welding It is easy to be c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/02B23K37/04
CPCB23K31/02B23K37/0443
Inventor 王筱磊银润邦奚旭莫其鹏高洁郑周
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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