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Technology of high-strength dual-phase steel sheet welded by high-speed laser wire filling welding

A technology of laser wire filling and dual-phase steel, applied in laser welding equipment, welding medium, welding equipment, etc., can solve problems such as softening of welding zone

Active Publication Date: 2018-04-20
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 the traditional welding method is used to connect dual-phase steel, the present invention adopts a welding wire containing Cu, Mo, V and other elements and high-energy rapid laser welding technology to provide optimized laser welding process parameters, In order 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 base metal of dual-phase steel, so as to meet the application requirements of the steel in automobiles, rail transportation, marine transportation, etc., and realize energy saving and reduction in structural lightweight. consume meaning

Method used

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  • Technology of high-strength dual-phase steel sheet welded by high-speed laser wire filling welding
  • Technology of high-strength dual-phase steel sheet welded by high-speed laser wire filling welding
  • Technology of high-strength dual-phase steel sheet welded by high-speed laser wire filling welding

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Effect test

Embodiment 1

[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 0.8mm, 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 0.22mm. Butt welding with IPG YLS-6000 fiber optic Nd:YAG laser, the defocus distance is +3 mm, the laser power is controlled at 1.8kW, and the welding speed is 24 mm the s -1 . The wire diameter is 0.6mm, and the wire feeding speed is 30mm the s -1 . High-purity argon is used as the shielding gas, the gas supply hose is fixed on...

Embodiment 2

[0035]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 1.3 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 0.25 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 2.4 kW, and the welding speed is 26 mm the s -1 . The wire diameter is 0.65 mm and the wire feed speed is 45 mm the s -1 . High-purity argon is used as the shielding gas, the gas supply hose is ...

Embodiment 3

[0037] 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 1.7 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 0.28 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 40 mm the s -1 . The wire diameter is 0.65 mm and the wire feed speed is 55 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 technology of high-strength dual-phase steel sheet welded by high-speed laser wire filling welding. The main technological parameters of welding are as follows that a fiber Nd: YAG laser is used for filling and butt welding; a welding seam prefabricated butt joint gap is 0.2-0.4mm; a focal length of a collecting lens is 15 cm; a defocusing distance is +3-3mm; a laser power is controlled to be 1. 8-6 kW the welding speed is 24-60 mm / s; the diameter of a welding wire ranges from 0.6-1.0 mm; and a wire feeding speed is 20-240 mm / s. The welding seam welding area is quite narrow, and is less than 0.65mm, a residual height is very small; the weld joint area is a thick martensite structure; a welding heat affected zone takes fine martensite tissue as main body and contains a small amount of ferrite. The hardness of a welding joint is in the range of 350-450 HV / 0, and the tensile strength of the welding joint is close to or even more than that of the base material;due to the effects of rapid cooling martensite strengthening and alloy strengthening, the hardness and strength of the welding joint are greatly improved.

Description

technical field [0001] The invention adopts high-speed laser wire-filled welding to perform heat conduction welding on high-strength dual-phase steel, thereby improving the mechanical properties of welded parts, and belongs to the field of special welding. technical background [0002] 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 suspension ...

Claims

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Application Information

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IPC IPC(8): B23K26/21B23K26/70B23K26/12B23K35/30
CPCB23K26/123B23K26/21B23K26/70B23K35/3073
Inventor 罗丰华周海铭姚谷李柘林李自刚
Owner CENT SOUTH UNIV
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