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A high-speed laser wire-filled deep penetration welding method for high-strength dual-phase steel thick plates

A technology of laser wire filling and deep penetration welding, used in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problem of softening of welding area

Active Publication Date: 2019-11-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of softening in the welding zone when ordinary welding methods are used to connect high-strength dual-phase steels, the present invention adopts a welding wire containing Ni, Cu, Mo, V and other elements and high-energy rapid laser welding technology, and provides optimized Laser welding process parameters to improve the mechanical properties of dual-phase steel joints, the purpose is to obtain the strength and hardness of the welded joints not lower than the dual-phase steel base material, so as to meet the application requirements of the steel in pressure vessels, rail transit, ocean transportation, bridges, etc.

Method used

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  • A high-speed laser wire-filled deep penetration welding method for high-strength dual-phase steel thick plates
  • A high-speed laser wire-filled deep penetration welding method for high-strength dual-phase steel thick plates
  • A high-speed laser wire-filled deep penetration welding method for high-strength dual-phase steel thick plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The steel plate used before welding is dual-phase steel, and its composition is listed in Table 1. The thickness of the steel plate is 4.6 mm, the steel plate is straight, the surface is clean, and there is no pollutants such as oil stains and water stains. Two duplex steel plates of the same length are fixed on the laser welding tooling table with a welding fixture, and then the butt joint surfaces of the two steel plates are cut out to be parallel to each other by a laser cutting method. With the help of the distance adjustment device of the welding table, the steel plate is moved in parallel to make the prefabricated butt joint gap of 1.02 mm. Filled butt welding with IPG YLS-6000 fiber optic Nd:YAG laser, the defocus distance is +3 mm, the laser power is controlled at 1.8 kW, and the welding speed is 10 mm the s -1 . The wire diameter is 1.2 mm and the wire feed speed is 30 mm the s -1 . High-purity argon is used as the shielding gas, the gas supply hose is ...

Embodiment 2

[0031] The steel plate used before welding is dual-phase steel, and its composition is listed in Table 1. The thickness of the steel plate is 6 mm, the steel plate is straight, the surface is clean, and there is no pollutants such as oil stains and water stains. Two duplex steel plates of the same length are fixed on the laser welding tooling table with a welding fixture, and then the butt joint surfaces of the two steel plates are cut out to be parallel to each other by a laser cutting method. With the help of the welding table distance adjustment device, the steel plate is moved in parallel to make the prefabricated butt joint gap of 1.15 mm. Filled butt welding with IPG YLS-6000 fiber optic Nd:YAG laser, the defocus distance is +2 mm, the laser power is controlled at 2.4 kW, and the welding speed is 12 mm the s -1 . The wire diameter is 1.4 mm and the wire feed speed is 30 mm the s -1 . High-purity argon is used as the shielding gas, the gas supply hose is fixed on ...

Embodiment 3

[0033] The steel plate used before welding is dual-phase steel, and its composition is listed in Table 1. The thickness of the steel plate is 7.5 mm, the steel plate is straight, the surface is clean, and there is no pollutants such as oil stains and water stains. Two duplex steel plates of the same length are fixed on the laser welding tooling table with a welding fixture, and then the butt joint surfaces of the two steel plates are cut out to be parallel to each other by a laser cutting method. With the help of the distance adjustment device of the welding table, the steel plate is moved in parallel to make the prefabricated butt joint gap of 1.28 mm. Filled butt welding with IPG YLS-6000 fiber optic Nd:YAG laser, the defocus distance is +1 mm, the laser power is controlled at 3.1 kW, and the welding speed is 14 mm the s -1 . The wire diameter is 1.6 mm and the wire feed speed is 30 mm the s -1 . High-purity argon is used as the shielding gas, the gas supply hose is ...

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Abstract

The invention discloses a penetration fusion welding method for a high-strength dual-phase steel thick plate through a high-speed laser filler wire. The main welding technical parameters are that theoptical fiber Nd:YAG laser filler wire is used for butt-joint penetration fusion welding, the welding seam prefabricated butt-joint gap is 1.0-1.6 mm, the focal length of a collecting lens is 15 cm, the defocus distance is -10-3 mm, the laser power is controlled to be 1.8-6 kW, the welding speed is controlled to be 10-60 mm.s<-1>, the welding wire diameter is 1.2-2.0 mm, and the wire feed speed is20-240 mm.s<-1>. The width of an obtained welding seam welding heat affected zone is smaller than 0.6 mm, the welding seam zone is of a coarse martensitic structure, the welding heat affected zone take a thin martensitic structure as priority, the hardness of a welded joint is 370-450 HV0.1, and the tensile strength of the welded joint is close to or even exceeds that of a base material. Throughthe effects of rapid cooling martensite strengthening and alloy strengthening, the hardness and strength of the welded joint are greatly improved.

Description

technical field [0001] The invention uses high-speed laser wire filling to carry out deep penetration welding of high-strength dual-phase steel, thereby improving the mechanical properties of welded parts, and belongs to the field of special welding. [0002] technical background [0003] As an advanced high-strength steel based on phase transformation, dual-phase steel is a dual-phase structure of ferrite soft phase and martensite (or bainite) hard phase obtained by controlling the cooling rate, which has good strength and plasticity. Performance, in line with the lightweight requirements of automobiles, has been widely used in the automobile manufacturing industry. The use of dual-phase steel in the body structure can not only reduce the weight of the body and reduce fuel consumption, but also increase the anti-sag ability of the body structure; the non-body structure adopts dual-phase steel Steel significantly increases the strength and fatigue performance of the suspensio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/211B23K26/60B23K26/70
CPCB23K26/211B23K26/60B23K26/70
Inventor 罗丰华周海铭姚谷李柘林李自刚
Owner CENT SOUTH UNIV
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