Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A high-speed laser wire-filled welding process for high-strength dual-phase steel sheets

A technology of laser wire filling and dual-phase steel, which is applied to laser welding equipment, welding equipment, welding media, etc., and can solve problems such as softening of the welding zone

Active Publication Date: 2019-11-12
CENT SOUTH UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A high-speed laser wire-filled welding process for high-strength dual-phase steel sheets
  • A high-speed laser wire-filled welding process for high-strength dual-phase steel sheets
  • A high-speed laser wire-filled welding process for high-strength dual-phase steel sheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 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. IPG YLS-6000 fiber optic Nd:YAG laser is used for butt welding with wire filling, the defocus distance is +3 mm, the laser power is controlled at 1.8kW, and the welding speed is 24 mm s -1 . The wire diameter is 0.6mm, and the wire feeding speed is 30 mm s -1 . High-purity argon is used as the shielding gas, the gas supply ho...

Embodiment 2

[0036]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. 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 s -1 . The wire diameter is 0.65 mm, and the wire feeding speed is 45 mm s -1 . High-purity argon is used as the shielding gas, the gas supply hose is fixed on the la...

Embodiment 3

[0038] 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. 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 s -1 . The wire diameter is 0.65 mm, and the wire feeding speed is 55 mm s -1 . High-purity argon is used as the shielding gas, the gas supply hose is fixed on the l...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

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. [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 sus...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com