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Single-arc dual-wire pipeline welding method

A single-arc double-wire, welding method technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as low efficiency, and achieve the effects of reducing welding cracks, fast welding speed, and improving smoothness

Inactive Publication Date: 2019-01-15
天津依海管道有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, electrode arc welding and semi-automatic welding were mainly used, and the efficiency was low. In particular, the welding quality of oil and gas pipelines was very high. It was necessary to control the occurrence of defects and smooth the inner surface of the weld bead. Therefore, how to improve welding efficiency and welding quality became the primary problem. , the single-arc double-wire pipeline welding method proposed by the present invention can effectively solve the above-mentioned problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The single-arc double-wire pipeline welding method proposed by the present invention comprises the following steps:

[0020] S1. Preparations before welding: Check the specifications and quality of the two pipelines to be welded, select the basic flux SJ101, select the special welding wire for oil and gas pipelines, and the diameter of the welding wire is 8mm, and confirm that the quality of the welding pipeline materials used meets the national standards. , Use a pipe beveling machine to process the two pipe ports to be welded. The bevel after grinding is a U-shaped bevel, the bevel angle is 30°, and the bevel width is 5mm;

[0021] S2. Check the condition of the groove after processing and polishing in step S1, clean the 18mm range on both sides of the groove, remove processing burrs, water marks, and rust, and leave 7mm of the blunt edge of the liner to ensure that the groove is smooth and smooth;

[0022] S3. Send the two pipelines to be welded into the spot welding...

Embodiment 2

[0026] The single-arc double-wire pipeline welding method proposed by the present invention comprises the following steps:

[0027] S1. Preparations before welding: Check the specifications and quality of the two pipelines to be welded, select the basic flux SJ301, select the special welding wire for oil and gas pipelines, and the diameter of the welding wire is 5mm, and confirm that the quality of the welding pipeline materials used meets the national standards. , Use a pipe beveling machine to perform bevel processing on the two pipe ports to be welded. The bevel after grinding is a V-shaped bevel, the bevel angle is 45°, and the bevel width is 10mm;

[0028] S2. Check the condition of the groove after processing and polishing in step S1, clean the 22mm range on both sides of the groove, remove processing burrs, water marks, and rust, and leave 6mm of the blunt edge of the liner to ensure that the groove is smooth and smooth;

[0029] S3. Send the two pipelines to be welded ...

Embodiment 3

[0033] The single-arc double-wire pipeline welding method proposed by the present invention comprises the following steps:

[0034] S1. Preparations before welding: Check the specifications and quality of the two pipelines to be welded, select the basic flux SJ101, and select the special welding wire for oil and gas pipelines, and the diameter of the welding wire is 7mm. Confirm that the quality of the welding pipeline materials used meets the national standards. , Use a pipe beveling machine to process the two pipe ports to be welded. The bevel after grinding is a U-shaped bevel, the bevel angle is 25°, and the bevel width is 4mm;

[0035] S2. Check the condition of the groove after processing and polishing in step S1, clean the 15mm range on both sides of the groove, remove processing burrs, water marks, and rust, and leave 8mm of the blunt edge of the liner to ensure that the groove is smooth and smooth;

[0036] S3. Send the two pipelines to be welded into the spot welding...

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Abstract

The invention discloses a single-arc dual-wire pipeline welding method. The single-arc dual-wire pipeline welding method comprises the following steps of firstly, carrying out preparation before welding, wherein the specifications and the quality of two pipelines to be welded are checked, and groove preparation and polishing are carried out; secondly, carrying out groove condition checking, wherein the two sides of each groove are cleaned, and it is guaranteed that grooves are flat and smooth; thirdly, sending the two pipelines to be welded into a spot welder for butt joint, and completing root welding; fourthly, setting the mode and technological parameters of self-adaptation control automatic welding apparatus; and fifth, using the set self-adaptation control automatic welding apparatusto carry out hot welding, and filling welding and cosmetic welding on the pipelines subjected to root welding till completing the whole process of welding operation. With the single-arc dual-wire pipeline welding method, the welding deposition rate is large, the welding speed is high, welding cracks are effectively lessened, the welding speed is obviously increased, the welding quality is obviously improved, the degree of welding heat affected zone microstructure coarsening and softening is reduced, and it is beneficial for improvement on the mechanical properties of a welded joint.

Description

technical field [0001] The invention relates to the technical field of pipeline welding, in particular to a single-arc double-wire pipeline welding method. Background technique [0002] In recent years, the global demand for oil and natural gas has soared. In order to transport natural gas from the place of production to the user, in addition to shipping by liquefied natural gas carrier, it has to rely on long-distance pipeline transportation. The characteristics of pipeline transportation are economical, safe and uninterrupted. efficient. According to reports, the total length of oil and gas pipelines in the world has reached 230×104 km, and 60% of the oil and gas pipelines laid every year are natural gas pipelines. Due to the high strength grade of oil and gas steel pipes, large pipe diameter and wall thickness, automatic welding and semi-automatic welding are mainly used in pipeline construction, supplemented by manual welding. In the past, electrode arc welding and sem...

Claims

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Application Information

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IPC IPC(8): B23K9/235B23K9/16
CPCB23K9/235B23K9/16
Inventor 杨春芳
Owner 天津依海管道有限公司
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