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Back-chipping-free double-wire submerged arc welding method of pipe-shaped structure

A tubular structure, submerged arc welding technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of large labor consumption, large flux consumption, irregular grooves, etc., to reduce labor intensity and environmental pollution , The effect of improving the internal quality of welding, saving time and cost

Inactive Publication Date: 2018-10-19
蓬莱大金海洋重工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The wind power tower is an important structural part supporting the wind turbine head and an important part of wind power generation. Its main manufacturing process is monofilament submerged arc welding. The main manufacturing process of the wind power tower is longitudinal seam welding and assembly after coiling For the final girth welding, the welded groove generally adopts X-shaped groove with a groove angle of 60°. After welding on one side, carbon arc gouging is performed on the other side, and after root cleaning, the carbon arc gouging is removed. slag inclusions, scale and other impurities, and then single-wire submerged arc welding, which is widely used in the manufacture of towers, has a lot of disadvantages, due to cumbersome procedures and low efficiency; carbon arc gouging is used for The labor consumption of workers is large, and it will pollute the environment, causing a lot of noise and dust; the groove after carbon arc gouging is irregular, prone to welding defects, and the weld shape is not beautiful; single wire submerged arc welding is used during welding, and welding Inefficient, high flux consumption

Method used

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Embodiment 1

[0017] Embodiment 1: Referring to the accompanying drawings, a double-wire submerged arc welding method without root cleaning for a tubular structure is used to weld the longitudinal seam and the circumferential seam of a thin plate with a thickness of 25 mm, including beveling, rolling the cylinder, preheating, and root welding , weld filling cover and weld quality inspection, including:

[0018] a. Beveling: grooves are made on the inner and outer sides of the welds at both ends of the steel plate, the inner and outer grooves are 35° one-way grooves, and the blunt edge between the inner groove and the outer groove is 3mm. The depth of the inner groove is 12.5mm, and the depth of the outer groove is 9.5mm;

[0019] b. Coiled cylinder: roll the steel plate that has been beveled according to the diameter of the cylinder. After rolling, the butt joints of the cylinder formed are seamless and tight, and a V-shape with an angle of 70° is formed at the inner and outer grooves. wel...

Embodiment 2

[0024] Embodiment 2: Referring to the accompanying drawings, a double-wire submerged arc welding method without root cleaning for a tubular structure is used to weld the longitudinal seam and the circumferential seam of a thin plate with a thickness of 25mm, including beveling, rolling the cylinder, preheating, and root welding , weld filling cover and weld quality inspection, including:

[0025] a. Beveling: grooves are made on the inner and outer sides of the welds at both ends of the steel plate, the inner and outer grooves are 35° one-way grooves, and the blunt edge between the inner groove and the outer groove is 3mm. The depth of the outer groove is 12.5mm, and the depth of the inner groove is 9.5mm;

[0026] b. Coiled cylinder: roll the steel plate that has been beveled according to the diameter of the cylinder. After rolling, the butt joints of the cylinder formed are seamless and tight, and a V-shape with an angle of 70° is formed at the inner and outer grooves. weld...

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Abstract

The invention relates to the technical field of manufacturing of wind power generation tower frames, in particular to a back-chipping-free double-wire submerged arc welding method of a pipe-shaped structure. The welding method is aimed at the longitudinal seam and circular seam welding of a thin plate with the thickness smaller than or equal to 30 mm, and comprises the steps of carrying out beveling, rolling a barrel body, carrying out preheating, carrying out backing weld, filling a cover surface at welding joints and carrying out welding joint quality inspection. According to the back-chipping-free double-wire submerged arc welding method, the double-arc double-wire submerged arc welding is adopted, so that the welding efficiency is improved by one time; and the backing-chipping-free technology is adopted, so that the gouging process is omitted compared with a traditional carbon arc air gouging technology, the time and the cost are saved, the labor intensity and the environmental pollution are reduced, the welding surface after forming is attractive in appearance, and the welding internal quality is improved; and mixed gas of Ar and CO2 is adopted for consumable electrode gas shielded welding, so that the weld joints are smooth in molding, the grinding time is shortened, the welding quality is improved, and the qualified rate of the weld joints is high.

Description

technical field [0001] The invention relates to the technical field of wind power generation tower manufacturing, in particular to a double-wire submerged arc welding method without root cleaning of a tubular structure. Background technique [0002] The wind power tower is an important structural part supporting the wind turbine head and an important part of wind power generation. Its main manufacturing process is monofilament submerged arc welding. The main manufacturing process of the wind power tower is longitudinal seam welding and assembly after coiling For the final girth welding, the welded groove generally adopts X-shaped groove with a groove angle of 60°. After welding on one side, carbon arc gouging is performed on the other side, and after root cleaning, the carbon arc gouging is removed. slag inclusions, scale and other impurities, and then single-wire submerged arc welding, which is widely used in the manufacture of towers, has a lot of disadvantages, due to cum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/235B23K9/173
CPCB23K9/173B23K9/18B23K9/235
Inventor 贾跃东樊铭林白玉龙董巧传
Owner 蓬莱大金海洋重工有限公司
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