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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

AI Technical Summary

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 surface is small, and there is not a large enough bearing area, which affects the mechanical properties of the joint.
[0005] At present, for laser lap welding of galvanized steel, in order to obtain a good weld shape, methods such as preheating before welding, reserving lap gaps or reducing welding speed are generally used. These methods have many procedures and low production efficiency.

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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Experimental program
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Effect test

Embodiment 1

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

[0048] From the basic principle, the quality of the weld seam is largely related to the evaporation of Zn during the welding process. In order to improve the quality of the weld and increase the strength of the joint, a solution can be found in the direction of building 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 to improve the forming quality and joint performance of the lap weld of galvanized dual-phase steel sheets, which specifically includes the followin...

Embodiment 2

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

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

[0069] Step 1: Take a 1.75mm DP steel plate with Zn coating and a 1.8mm thick DP steel plate without coating, purify the surface, and prepare welding fixtures for use;

[0070] Step 2: Place two DP steel plates that have undergone surface purification treatment on the workbench, where the steel plate with Zn coating is placed on the steel plate without coating, and fixed with a welding fixture to ensure that the overlapping parts of the two test plates Fits perfectly and stays flat;

[0071] Step 3: Place the double-beam laser welding head above the test plate to be welded. The incident direction of the laser beam ...

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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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