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.

Inactive Publication Date: 2008-10-15
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the manufacturing level of lasers in the prior art, the laser output mode and the thickness of welding materials are not up to the aforementioned conditions, thus limiting the application of laser welding

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Embodiment 1 of the present invention: laser welding of 30CrMnSiNi2A ultra-high-strength steel: the 30CrMnSiNi2A ultra-high-strength steel welding sample is cut by molybdenum wire, and the welded joint of the sample is polished with metallographic sandpaper before welding, derusted and deburred, and used Wash with acetone, and then use narrow-band TJ-HL-T5000 continuous CO 2 Laser, the mixed low-order mode is selected in the cavity, the copper mirror is focused by transmission, the focal length is 310mm, and the laser welding is performed under the conditions of laser output power P = 2.8KW, scanning speed V = 180mm / min, and spot diameter d = 1.0mm. Thickness 1mm. The results of microstructure analysis and tensile fracture analysis show that the welded joint has no welding defects, no inclusions, no pores, and good fusion.

Embodiment 2

[0060] Embodiment 2 of the present invention: laser welding of 30CrMnSiNi2A ultra-high-strength steel: the 30CrMnSiNi2A ultra-high-strength steel welding sample is cut by molybdenum wire, and the welded joint of the sample is polished with metallographic sandpaper before welding, derusted and deburred, and used Wash with acetone, followed by narrow-band continuous CO 2 Laser, the mixed low-order mode is selected in the cavity, the copper mirror is focused by transmission, the focal length is 315mm, and the laser welding is performed under the conditions of laser output power P = 2.6KW, scanning speed V = 240mm / min, and spot diameter d = 0.7mm. Thickness 1mm. The results of microstructure analysis and tensile fracture analysis show that the welded joint has no welding defects, no inclusions, no pores, and good fusion.

Embodiment 3

[0061] Embodiment 3 of the present invention: laser welding of 300M ultra-high-strength steel: the 300M ultra-high-strength steel welding sample is cut by molybdenum wire, and the welding joint of the sample is polished with metallographic sandpaper before welding, derusted and deburred, and used Wash with acetone, followed by narrow-band continuous CO 2 Laser, select mixed low-order modes in the cavity, copper mirror transmission focus, focal length 300mm, laser welding under the conditions of laser output power P=3.2KW, scanning speed V=60mm / min, spot diameter d=0.5mm, welding Thickness 1mm. The results of microstructure analysis and tensile fracture analysis show that the welded joint has no welding defects, no inclusions, no pores, and good fusion.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/20B23K26/42B23K26/04B23K26/32B23K26/21B23K26/70
Inventor 刘其斌白丽锋
Owner GUIZHOU UNIV
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