Serial double-beam high-speed laser welding method and system for galvanized double-phase steel plates and medium

A laser welding, double beam technology, applied in laser welding equipment, welding equipment, metal processing equipment and other directions, can solve the problems of reducing the mechanical properties of welding joints, reducing welding heat input, low production efficiency, etc., to prolong the cooling of the molten pool. time, the effect of reducing the hardening tendency of the weld and improving the quality of the weld

Active Publication Date: 2020-11-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existence of Zn vapor will have a strong impact on the welding pool, and the molten metal will be rushed out of the pool, resulting in a large number of welding defects such as splashes and pores, thereby seriously reducing the mechanical properties of the welded joint.
However, when the welding speed is fast, due to the reduction of welding heat input, the area of ​​the welding joint

Method used

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  • Serial double-beam high-speed laser welding method and system for galvanized double-phase steel plates and medium
  • Serial double-beam high-speed laser welding method and system for galvanized double-phase steel plates and medium
  • Serial double-beam high-speed laser welding method and system for galvanized double-phase steel plates and medium

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Example Embodiment

[0046] Example 1:

[0047] Due to the presence of the Zn coating on the galvanized steel sheet, there is a huge difference between the Zn evaporation temperature and the steel melting temperature. The Zn vapor evaporated during the welding process will impact the molten pool, forming a large number of spatters, holes and other defects, which seriously affect the mechanical properties of the joint.

[0048] Starting from the basic principles, the quality of the weld is largely related to the evaporation of Zn during the welding process. In order to improve the quality of the weld and the strength of the joint, a solution can be found in the direction of constructing a stable escape channel for Zn vapor.

[0049] Based on the above principles, such as figure 1 As shown, the present invention provides a tandem dual-beam laser welding process for improving the forming quality and joint performance of lap welds of galvanized dual-phase steel sheets, which specifically includes the followi...

Example Embodiment

[0066] Example 2:

[0067] This example provides a tandem dual-beam laser welding process for improving the lap weld formation and joint performance of galvanized dual-phase steel sheets.

[0068] In this case, the experimental material is a 1.75mm thick Zn-coated DP steel sheet and a 1.8mm thick non-galvanized DP steel sheet, and the Zn coating is about 10μm.

[0069] Step 1: Take a 1.75mm DP steel plate with Zn coating and a 1.8mm thick non-coated DP steel plate, clean the surface, and prepare welding fixtures for use;

[0070] Step 2: Lap two DP steel plates with surface purification treatment on the workbench. Among them, the Zn-coated steel plate is placed on the uncoated steel plate and fixed with a welding fixture to ensure the overlap of the two test plates Fully fit and keep flat;

[0071] Step 3: Place the dual-beam laser welding head above the test board to be welded. The incident direction of the laser beam on the test board is inclined by about 7° along the welding directi...

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Abstract

The invention provides a serial double-beam high-speed laser welding method and system for galvanized double-phase steel plates and a medium. The method includes the steps that a double-phase DP steelplate with Zn cladding and a double-phase DP steel plate without cladding are obtained, and the surfaces are purified; the two DP steel plates obtained after surface purification are lapped and arranged on a workbench; a double-beam laser welding working head is arranged above a to-be-welded test plate; a shielding gas side blowing device is arranged in front of the laser welding working head, ablowing port is adjusted to point to a welding pool, and a 45-degree included angle is formed between the direction of the blowing port and the laser incidence direction; and laser welding process parameters are adjusted according to the steel plate thickness combination, and laser welding of a lapping connector for the DP steel plate with the Zn cladding and the DP steel plate without the cladding is completed. It is only needed to adjust proper double-beam laser welding parameters, the influences of Zn steam in the welding process are reduced through the mutual effect of a front laser beam and the test plate, the front laser beam and a rear laser beam mutually cooperate to achieve high-speed welding, welding defects are eliminated, and the connector strength is improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method, system and medium for tandem double-beam high-speed laser welding of galvanized dual-phase steel sheets. In particular, it relates to a tandem dual-beam high-speed laser welding method for improving the forming quality and joint performance of lap welds of galvanized dual-phase steel sheets. Background technique [0002] In order to meet the current automotive industry's demand for automotive safety and lightweight, advanced high-strength steels have been widely used in domestic and foreign automotive industries. Advanced high-strength steel has excellent performance and low processing cost, and can meet the needs of automobile safety and lightweight at the same time. Among them, galvanized dual-phase (DP) steel is one of the most widely used advanced high-strength steels. Dual-phase steel is a steel with a dual-phase structure of martensite and ferrite, which has hig...

Claims

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Application Information

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IPC IPC(8): B23K26/12B23K26/21B23K26/60
CPCB23K26/21B23K26/60B23K26/123
Inventor 唐新华朱正辉崔海超芦凤桂徐力栋张若林
Owner SHANGHAI JIAO TONG UNIV
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