A kind of laser arc hybrid welding method for girth weld of oil and gas long-distance pipeline

A long-distance pipeline, laser arc technology, applied in laser welding equipment, welding equipment, metal processing equipment and other directions, can solve the problems of large stress concentration coefficient at the weld, low fatigue strength of the weld, rough weld, etc. Increased efficiency, improved forming quality, and reduced welding costs

Active Publication Date: 2022-07-15
DAQING PETROLEUM ADMINISTRATION +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the existing laser welding seam roughness, large stress concentration coefficient at the weld seam, and low fatigue strength of the weld seam, the present invention provides a laser arc hybrid welding method for the circumferential weld seam of long-distance oil and gas pipelines. The long-distance oil and gas pipeline The laser arc hybrid welding method of the girth weld uses the composite heat source formed by the welding arc and the laser beam to realize the control of the penetration ability of the overall heat source, which can meet the adjustment of different parameters at different positions of the pipeline girth weld, and greatly improve the quality of the pipeline girth weld. Excellent welding efficiency and welding quality, expanding the application field of laser welding

Method used

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  • A kind of laser arc hybrid welding method for girth weld of oil and gas long-distance pipeline
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Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1: Laser-induced arc hybrid welding of Φ813×16mm pipe fittings made of X80 material.

[0025] The MIGAW arc is perpendicular to the groove position of the pipe, and the laser is obliquely incident. The angle between the arc and the laser is A = 30°, the arc current is 180A, the laser adopts the pulse mode, and the average laser output power is 500W. The distance between the laser action point and the center point of the heat source Dla=1.0-5.0mm, and the welding speed is 1.5m / min. The above-mentioned process can realize the welding of φ813×16mm pipeline with beautiful shape, high efficiency and low deformation.

Embodiment 2

[0026] Example 2: Laser-induced arc hybrid welding of Φ1422×22mm pipe fittings made of X80 material.

[0027] The MIGAW arc is perpendicular to the groove position of the pipe, and the laser is obliquely incident. The angle between the arc and the laser is A = 30°, the arc current is 180A, the laser adopts the pulse mode, and the average laser output power is 500W. The distance between the laser action point and the center point of the heat source Dla=1.0-5.0mm, and the welding speed is 1.5m / min. The above-mentioned process can realize the welding and manufacturing of φ1422×22mm pipeline welds with beautiful shape, high efficiency and low deformation.

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Abstract

A laser arc hybrid welding method for a girth weld of an oil and gas long-distance pipeline. It mainly solves the problems of rough welding seam, large stress concentration coefficient at the welding seam and low welding seam fatigue strength in the existing laser welding. It is characterized in that: (1), adjust the position of the pipeline, the arc welding heat source and the laser beam, firstly fix the position of the arc welding gun, so that the arc electrode is perpendicular to the tangential direction of the pipeline weld, the laser beam is located at the front end of the arc electrode on the upper part of the weld, and makes the The laser beam and the arc overlap; (2), adjust the parameters of the laser beam and the arc heat source, and align the composite heat source formed by the laser beam and the arc to the pipeline welding seam; (3), make the laser beam and the arc electrode move forward along the welding seam together Move and weld the pipe. The laser arc composite welding method for the girth weld of the oil and gas long-distance pipeline utilizes the composite heat source formed by the welding arc and the laser beam to realize the regulation of the penetration ability of the overall heat source, and can greatly improve the welding efficiency and welding quality of the girth weld of the pipeline.

Description

technical field [0001] The invention relates to the field of oil fields, in particular to a laser arc composite welding method for a girth weld of an oil and gas long-distance pipeline. Background technique [0002] Pipe girth welding is a key link in pipeline construction. At present, most of them are carried out by electrode arc welding, flux-cored semi-automatic welding and gas metal arc welding (GMAW). layer weld. At present, laser welding technology is applied to the welding of pipeline girth welds. It does not need to be grooved or the groove size is small, and it can even penetrate through one time. It is undoubtedly another revolution in pipeline welding technology, but pure laser welding and laser wire filling The welding seam is rough, the stress concentration coefficient at the welding seam is large, and the joint assembly accuracy is required during the welding process (the joint assembly gap is less than 0.5mm). affect the quality of the pipeline. SUMMARY OF...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B23K26/348B23K26/70
CPCB23K26/348B23K26/702
Inventor刘家发赵洪元董利苹张先龙朱宪宝姜威蒋风松
OwnerDAQING PETROLEUM ADMINISTRATION