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Laser-electric arc hybrid welding process for steel for medium-thickness plate ocean platform

A hybrid welding and offshore platform technology, applied in laser welding equipment, welding equipment, manufacturing tools, etc., can solve problems such as hindering arc welding droplet transfer, increasing laser reflectivity, reducing energy utilization, etc. The effect of refinement, promotion of droplet transfer, and arc energy concentration

Inactive Publication Date: 2022-02-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when using laser-arc hybrid welding of medium and thick plate steel, if only one welding is performed, a large laser power is required. At this time, the plasma gas generated by laser irradiation on the steel surface will increase the reflectivity of the laser and reduce energy utilization. At the same time, it will hinder the arc welding droplet transfer, resulting in difficult droplet transfer and other problems

Method used

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  • Laser-electric arc hybrid welding process for steel for medium-thickness plate ocean platform
  • Laser-electric arc hybrid welding process for steel for medium-thickness plate ocean platform
  • Laser-electric arc hybrid welding process for steel for medium-thickness plate ocean platform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Using 20mm EH36 steel thick plate as the welding base material, the sample size is processed to 100mm×50mm by wire cutting, the groove is Y-shaped groove angle is 30°, the blunt edge is 6mm, and no gap is left. The joint form is plane butt joint; alcohol is used for cleaning before welding.

[0020] The first layer of root welding uses laser alone as the welding heat source, and the equipment uses TruDisk 6002 laser. The angle between the laser and the plate is 90°, the defocus is ±3mm, the laser power is 4kW, the welding speed is 0.01m / s, the shielding gas is argon, the flow rate of the shielding gas on the surface is 35L / min, and the flow rate on the back is 20L / min; The second and third layers of filling welding adopt laser arc composite heat source, the angle between the laser and the plate is 90°, the arc equipment adopts Fronius TPS5000 welding machine, the angle between the arc and the plate is 60°, and the distance between the arc and the laser arc is 5-6mm. Th...

Embodiment 2

[0023] Using 20mm EH36 steel thick plate as the welding base material, the sample size is processed to 100mm×50mm by wire cutting, the groove is Y-shaped groove angle is 30°, the blunt edge is 6mm, and no gap is left. The joint form is plane butt joint; use alcohol to clean the workpiece before welding.

[0024] The first layer of root welding uses laser alone as the welding heat source, and the equipment uses TruDisk 6002 laser. The angle between the laser and the plate is 90°, the defocus is ±3mm, the laser power is 4kW, the welding speed is 0.01m / s, the shielding gas is argon, the flow rate of the shielding gas on the surface is 35L / min, and the flow rate on the back is 20L / min; The second and third layers of filling welding adopt laser arc composite heat source, the angle between the laser and the plate is 90°, the arc equipment adopts Fronius TPS5000 welding machine, the angle between the arc and the plate is 60°, and the distance between the arc and the laser arc is 5-6m...

Embodiment 3

[0027] Using 20mm EH36 steel thick plate as the welding base material, the sample size is processed to 100mm×50mm by wire cutting, the groove is Y-shaped groove angle is 30°, the blunt edge is 6mm, and no gap is left. The joint form is plane butt joint; use alcohol to clean the workpiece before welding.

[0028] The first layer of root welding uses laser alone as the welding heat source, and the equipment uses TruDisk 6002 laser. The angle between the laser and the plate is 90°, the defocus is ±3mm, the laser power is 4kW, the welding speed is 0.01m / s, the shielding gas is argon, the flow rate of the shielding gas on the surface is 35L / min, and the flow rate on the back is 20L / min; The second and third layers of filling welding adopt laser arc composite heat source, the angle between the laser and the plate is 90°, the arc equipment adopts Fronius TPS5000 welding machine, the angle between the arc and the plate is 60°, and the distance between the arc and the laser arc is 5-6m...

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Abstract

The invention discloses a laser-electric arc hybrid welding process for steel for a medium-thickness plate ocean platform, and belongs to the field of laser-electric arc hybrid welding. Aiming at the problems of high carbon equivalent and poor weldability of steel for the medium-thickness ocean platform, low welding efficiency, high cost, obvious incomplete penetration phenomenon during welding and the like of a traditional process, a laser-electric arc hybrid welding heat source is adopted, and meanwhile, a three-layer and three-pass welding method is matched, butt welding of the EH36 steel plate with the thickness of 20 mm is achieved, the continuity and uniformity of a welding seam are good, and the surface of a weld joint is well formed without obvious welding defects. According to the process, the welding efficiency can be remarkably improved, and meanwhile the welding seam forming quality is improved. The method has important significance in promoting the application and development of the laser-arc hybrid welding process in the field of butt welding of medium-thickness plates.

Description

technical field [0001] The invention proposes a laser-arc hybrid welding process for medium-thick plate offshore platform steel, which belongs to the field of laser-arc hybrid welding, and is suitable for the multi-layer and multi-pass welding process of medium-thick plate offshore platform steel butt joints. Background technique [0002] The traditional welding method of medium and heavy plate steel is difficult to meet the high-speed development of the industry's demand for welding quality and efficiency. At the same time, when the composition design and preparation of medium and heavy plate steel, more alloying elements will be added to ensure its good mechanical and technological properties, but this will lead to an increase in the carbon equivalent of the steel, a decrease in weldability, and the formation of Martensitic alloys during welding. Body and carbide, have a greater hardening tendency and restraint. Therefore, in the actual welding production process, it has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/24B23K26/348
CPCB23K26/348B23K26/24
Inventor 魏艳红金洪西孔斌王猛王新栋王翰喆
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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