High-nitrogen steel double-beam laser and (N-MIG) electric arc composite welding method

A hybrid welding and laser welding technology, which is applied in the field of material processing, can solve the problems of low welding efficiency, undercut of welding tumors, nitrogen loss, etc., and achieve the effects of fast welding speed, small workpiece deformation, and reduced nitrogen loss

Inactive Publication Date: 2020-11-24
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of low penetration depth, serious nitrogen loss, undercutting and other defects and low welding efficiency when high-nitroge

Method used

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  • High-nitrogen steel double-beam laser and (N-MIG) electric arc composite welding method
  • High-nitrogen steel double-beam laser and (N-MIG) electric arc composite welding method
  • High-nitrogen steel double-beam laser and (N-MIG) electric arc composite welding method

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Embodiment

[0035] In this embodiment, the welding of 12mm thick high-nitrogen steel is taken as an example, and the double-beam laser + (N-MIG) arc hybrid welding method is used to weld it, including the following steps:

[0036] S1: Before welding, the parts to be welded are processed into I-shaped grooves, and the grooves and surfaces are cleaned, and the cleaned workpieces to be welded are clamped on the workbench;

[0037] S2: Along the welding direction, the dual-beam laser heat source is positioned in front and the N-MIG arc heat source is positioned behind. The distance between the double-beam laser heat source and the N-MIG arc heat source is 2mm. The test plate is at an angle of 90°, the MIG welding torch and the workpiece to be welded are at an angle of 60°, and the double-beam welding head, the MIG welding torch and the side blowing protective gas pipe are rigidly fixed with a fixture.

[0038] S3: Set welding process parameters:

[0039] The laser power is 8kW, the power rat...

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Abstract

The invention discloses a high-nitrogen steel double-beam laser and (N-MIG) electric arc composite welding method and relates to the field of material machining. Laser beams emitted by a solid laser are transmitted to a double-beam laser welding head through optical fiber, two beams of laser with adjustable energy are produced, reach a welding portion simultaneously and then are compounded with anN-MIG electric arc heat source in a paraxial manner, the laser and the N-MIG electric arc heat source jointly act on the to-be-welded portion, an eutectic pool is formed, and a high-quality welding seam is obtained. According to the method provided by the invention, a double-beam laser heat source with adjustable energy and the N-MIG electric arc heat source act on a high-nitrogen steel base material in a serial arrangement manner, efficient high-quality welding is achieved, and the method can be used for controlling distribution of welding temperature fields, improving the welding stabilityand the adaptability to connectors, effectively reducing nitrogen loss and improving the microstructure of the welding seam.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a double beam laser+(N-MIG) arc composite welding method for high nitrogen steel. Background technique [0002] As a new structural and functional steel with high strength, high plasticity, high resistance to high-speed impact, and high corrosion resistance, high nitrogen steel has a very wide and important application prospect. However, due to its unique physical and chemical properties and The relatively special smelting and preparation process makes it have relatively special welding performance and welding process bottlenecks. The solubility of nitrogen in high-nitrogen steel is extremely low. During smelting and preparation, high-nitrogen steel is prepared by "high-pressure nitrogen method" or "nitrogen composition synergy method". The process is complicated and difficult; Melting under the action of laser and electron beam heat sources, nitrogen escapes and i...

Claims

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Application Information

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IPC IPC(8): B23K26/348B23K26/60
CPCB23K26/348B23K26/60
Inventor 江俊龙王克鸿
Owner NANJING UNIV OF SCI & TECH
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