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Double-side double-arc welding process for root layer of pipeline

A double-sided, double-arc, pipeline technology, applied in arc welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of welding quality welding defects, incomplete penetration, undercut, etc., to ensure welding quality, reduce welding costs, The effect of reducing welding distortion

Active Publication Date: 2012-10-24
CHINA NAT CHEM ENG NO 7 CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above-mentioned technical scheme, the parameters of the welding torches on both sides of the weld seam are exactly the same. In this way, compared with the process of single-side welding and double-side forming, although it reduces the welding difficulty and improves the welding efficiency, the welding quality is still inferior. Welding defects appear, such as undercut, weld bump, incomplete penetration, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: A double-sided double-arc welding process for the root layer of a pipeline, comprising the following steps:

[0031] (1) Preparation before welding

[0032] a) Make a V-shaped groove at the corresponding part of the weld seam of the pipeline 1 to be welded, and clean the oil, paint, scale, rust, burr and galvanized layer on the groove and its inner and outer surfaces within a range of not less than 20mm clean;

[0033] b) Assemble the pipe 1 with a V-shaped butt joint groove, and the welding position is all positions, such as figure 2 As shown, the groove angle of the V-shaped groove formed at the weld of the pipeline is 55-70°, the gap b is 2-3 mm, and the blunt edge p is 0.5-1 mm;

[0034] c) Tungsten argon arc welding is used for spot welding, the length of the spot welding is 30cm, the number of spot welding is 8 points and the current of the welding machine is 105A evenly distributed;

[0035] d) Set the main gun 3 on the outside of the pipe weld,...

Embodiment 2

[0048] Embodiment 2: A stainless steel pipe whose material is 00Cr19Ni10 and whose specification is φ1117×5 is welded at the root layer by double-sided double-arc welding, and the welding process is the same as that of Embodiment 1. Perform visual inspection, PT inspection, X-ray inspection on the weld, 100% qualified.

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Abstract

The invention discloses a double-side double-arc welding process for a root layer of a pipeline, and the process comprises preparation before welding and backing welding. By utilizing the backing welding process of the double-side double-arc welding for the root layer of a pipeline disclosed by the invention, the inside and outside welding seams of the pipeline can be formed once, and the both surfaces of a molten pool for the pipeline are always in the protection of argon, so that the generation of air vents is avoided, the formation for the inside and outside welding seams of the pipeline is good, the dimensional requirements are relatively decreased due to assembly, the welding difficulty of welders is decreased, welding deformations are reduced, welding speed is increased, welding efficiency is increased, welding defects are reduced, energy and welding materials are saved, and welding cost is reduced. Simultaneously, by virtue of the design for the process parameters of a welding gun for the inside and outside of the pipeline, and under the action of the blowing force of double arcs, the flowability of metals in the molten pool is improved, the heat energy of the double arcs is adequately exerted, the penetration capacity is improved, and the welding characteristics of stainless steel are adapted, thus improving the quality of welding joints, and guaranteeing the welding quality.

Description

technical field [0001] The invention relates to the technical field of welding technology, in particular to a double-sided double-arc welding technology suitable for the root layer of large-diameter pipelines (DN≥450). Background technique [0002] In pipeline construction, welding is the core link of the entire pipeline construction, and the quality of the project depends on the quality of welding. And adopt the method construction of high efficiency, high quality, low cost and easy operation, to solve the contradiction of construction schedule and construction quality, be the goal pursued by those skilled in the art always. [0003] Most of the current stainless steel pipes are formed by single-sided welding and double-sided forming, that is, a welding torch is used to perform bottom welding on the outside of the pipe, and an inert gas such as argon is filled inside the pipe to protect the weld seam and prevent oxidation. , for large-diameter pipes, it is necessary to con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235
Inventor 孙逊叶斌
Owner CHINA NAT CHEM ENG NO 7 CONSTR
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