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Method for welding narrow-gap butt-joint connector of pipeline with large pipe diameter and thick wall

A technology of butt joint and welding method, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of large workload, poor welding effect and high cost

Active Publication Date: 2012-09-05
CHINA NUCLEAR IND 23 CONSTR +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In order to solve the problems of heavy workload, poor welding effect and long welding cycle in the TIG+SMAW welding method in the prior art, the TOCE welding method cannot weld the butt joint with a pair gap greater than 1.0mm, which leads to extended construction period and high cost. The invention proposes a method for welding narrow-gap butt joints of large-diameter thick-walled pipes, the pipe diameter of which is > 700 mm, and the wall thickness > 30 mm. The welding method includes the following steps:

Method used

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  • Method for welding narrow-gap butt-joint connector of pipeline with large pipe diameter and thick wall
  • Method for welding narrow-gap butt-joint connector of pipeline with large pipe diameter and thick wall
  • Method for welding narrow-gap butt-joint connector of pipeline with large pipe diameter and thick wall

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1: For 5G1T / 5G2T positions, Weld the test pieces with a gap of 3.49mm

[0057] The specification of the welding test piece is That is, the pipe diameter is 873mm, the pipe wall thickness is 69mm, the material is stainless steel, and the grade is Z3CN20-09M. The equipment used in welding is:

[0058] The test pieces to be welded are assembled first, and 8 point fixing rods are set in the docking interface to fix the relative positions of the two test pieces to be assembled, and then welding is carried out according to the welding parameter table in the following steps.

[0059] (1) Combination of test pieces

[0060] The number of spot-fixing rods and welding parameters during spot-welding are shown in Table 1-1.

[0061] Table 1-1:

[0062]

[0063] Among them: L / min is liter / minute; A is ampere.

[0064] (2) TIG bottom welding

[0065] Welding parameters for backing welding are shown in Table 1-2.

[0066] Table 1-2:

[0067]

[0068] (3...

Embodiment 2

[0111] Example 2: Welding the 2GT position, group pair gap 3.62mm welding test piece

[0112] The specification of the welding test piece is The material is stainless steel, the grade is Z3CN20-09M. The equipment used in welding is

[0113] First, group the test pieces to be welded, and set 8 point fixing rods in the butt joint to fix the relative positions of the two test pieces in the pair, and then perform welding according to the welding parameter table in the following steps.

[0114] (1) Combination of test pieces

[0115] The number of spot-fixing rods and welding parameters during spot-welding are shown in Table 2-1.

[0116] table 2-1:

[0117]

[0118] (2) TIG bottom welding

[0119] The welding parameters for backing welding are shown in Table 2-2.

[0120] Table 2-2:

[0121]

[0122] (3) The 1st and 2nd TOCE wire welding is TOCE preliminary filling welding

[0123] When performing preliminary filler welding, use the "deviation welding" method fo...

Embodiment 3

[0160] Embodiment 3: For 2GT position, Weld the test pieces with a gap of 1.2mm

[0161] The specifications of the welded test pieces are The material is stainless steel, the grade is Z3CN20-09M. The equipment used in welding is:

[0162] The test pieces to be welded are assembled first, and 6 point fixing rods are set in the docking interface to fix the relative positions of the two test pieces to be assembled, and then welding is performed according to the welding parameter table in the following steps.

[0163] (1) Combination of test pieces

[0164] The setting quantity of spot-fixing rods and the welding parameters during spot-fixing welding are shown in Table 3-1.

[0165] Table 3-1:

[0166]

[0167] (2) TIG bottom welding

[0168] The welding parameters for backing welding are shown in Table 3-2.

[0169] Table 3-2:

[0170]

[0171] (3) The 1st and 2nd TOCE wire welding is TOCE preliminary filling welding

[0172] When performing preliminary filli...

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Abstract

The invention relates to a welding method of a butt-joint connector of a pipeline. The invention provides a method for welding a narrow-gap butt-joint connector of a pipeline with a large pipe diameter and a thick wall to solve the problems of a TIG+SMAW (Tungsten Inert Gas+Shielded Metal Arc Welding) welding method in the prior art that the working amount is great, a welding effect is poor and the welding period is long; and a TOCE welding method cannot weld the butt-joint connector with the assembling gap which is more than 1.0 mm so that the working period is prolonged and the cost is high. The diameter of the pipeline is more than 700 mm and the wall thickness is more than 30 mm; test pieces are assembled and are protected by back argon; TIG bottoming welding is carried out on the inner wall of the pipeline to be welded; bottoming original filling welding is carried out and a partial welding path is adjusted according to requirements; and TOCE filling welding and capping covering are carried out, so that the welding is finished. With the adoption of the welding method, the butt-joint connector with the assembling gap which is more than 1.0 mm can be welded and the pipeline butt-joint difficulty is reduced; a TIG manual welding method is used for welding when tack welding and bottoming welding are carried out; other welding work adopts a TOCE automatic welding method to weld; and the welding speed and the welding effect are improved, the working period is shortened and the cost is reduced.

Description

technical field [0001] The invention relates to a welding method for butt joints of pipelines, in particular to a welding method for narrow gap butt joints of large-diameter thick-walled pipelines. Background technique [0002] In many industries such as nuclear power plant construction and shipbuilding, as well as when installing equipment such as boilers or pressure vessels, it is necessary to connect stainless steel pipes with large diameters and thick walls, and to connect them The joints are welded to connect two pipes that are butted together. [0003] At present, when welding the butt joints of large-diameter and thick-walled pipelines, the following two methods are usually used: one is TIG+SMAW (manual welding: TIG, Tungsten Inert Gas Welding, tungsten argon arc welding, here Expressed as manual argon tungsten arc welding; SMAW, Shield Metallic Arc Welding, electrode arc welding), the other is TOCE (narrow gap automatic welding, TOCE is the French abbreviation for n...

Claims

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Application Information

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IPC IPC(8): B23K9/00B23K9/167B23K9/235
Inventor 韩乃山胡广杰张伟栋曹冬巍冯英超王海东
Owner CHINA NUCLEAR IND 23 CONSTR
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