Application of laser weld in ultra-high tensile steel welding and welding method

An ultra-high-strength steel and laser welding technology, applied in the metallurgical field, can solve the problems of limiting laser welding and the thickness of laser manufacturing level welding materials, and achieve the effect of low welding equipment cost, excellent polarization performance, and continuous production operations.
CN101284334AInactive Publication Date: 2008-10-15GUIZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUIZHOU UNIV
Publication Date
2008-10-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses the application of laser welding on Unimach and a welding method thereof, which comprises the steps of cutting a Unimach welded sample cut by adopting a molybdenum wire; polishing the welding joint of the sample with metallographical sand paper before welding; removing rust and chips; cleaning with acetone; and adopting a CO2 laser for laser welding. Compared with prior art, the method adopts the laser for welding the Unimach without the need of gas shielding, and penetration welding with welding thickness of 1mm results in good welding effect. The welding joint is smooth and fine macroscopically, without cracks or holes generated. The microstructure analysis and the stretching fracture analysis show that the welding joint is free of welding defects, impurities and pores, and has good fusion, thus greatly improving the anti-cracking performance of the Unimach welding joint.
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Description

Technical field:

[0001] The invention relates to the application and welding method of laser welding in the welding of ultra-high-strength steel, especially the application and welding method in the welding of 30CrMnSiNi2A or 300M ultra-high-strength steel, belonging to the field of metallurgy technology. Background technique:

[0002] Laser beam welding (LBW) is a high energy density fusion welding method. It is a welded joint formed by heating the metal to be welded above the melting temperature with a laser beam. 30CrMnSiNi2A ultra-high-strength steel is an aeronautical structural material with excellent comprehensive performance. Its high specific strength and high hardness make it capable of bearing static loads and large bending and impact loads. Steel for drop frame production. The aircraft landing gear system is the main part of the aircraft take-off and landing (excluding the wheels, tires and brakes), its mass accounts for about 2%-3.5% of the aircraft's own weig...

Claims

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