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Method for obtaining whole martensite welding part of coated manganese-boron steel plate

A technology for welding parts and martensite, applied in welding media, welding equipment, welding equipment, etc., can solve the problems of high cost, high energy consumption, low production efficiency, etc., achieve good mechanical properties, reduce processing costs, and improve work. Efficiency and economic benefits

Inactive Publication Date: 2019-06-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, this method is relatively slow, and the production efficiency is low. The simultaneous introduction of arc and laser leads to high energy consumption and low economic benefits of this method.
[0006] During the welding process of aluminum-silicon-coated manganese-boron steel plate, the coating elements enter the welding melt to aggregate and segregate, resulting in the formation of hard and brittle intermetallic compounds or the induction of δ-ferrite, which is harmful to the first part along the weld under load. Two-phase breakage, resulting in failure
Therefore, it is necessary to inhibit the plating elements from entering the weld pool to form harmful second phases. The current methods of removing coatings or composite welding have problems such as high cost, low production efficiency, and insufficient suppression of harmful second phases. A new method is needed. Method to inhibit the flow and accumulation of coatings in the molten pool

Method used

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  • Method for obtaining whole martensite welding part of coated manganese-boron steel plate
  • Method for obtaining whole martensite welding part of coated manganese-boron steel plate
  • Method for obtaining whole martensite welding part of coated manganese-boron steel plate

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Embodiment 1

[0035] Such as figure 1As shown, the aluminum-silicon-coated manganese-boron steel sheet involved in the present invention consists of a manganese-boron steel sheet substrate 3 and a coating, wherein the coating consists of an aluminum-silicon alloy layer 1 placed on the outer layer and an aluminum-iron intermetallic compound layer 2 placed on the inner layer Composition, the thickness of the aluminum-silicon alloy layer 1 is 20 μm, the thickness of the aluminum-iron intermetallic compound layer 2 is 3 μm, the thickness of the manganese-boron steel plate substrate 3 is 1.5 mm, the length is 500 mm, and the width is 200 mm. First select the area 5 to be welded, and use a rapid heat source 6 to form a stable temperature of 750 ° C in the in-situ modified area 4 of the surface coating of the area 5 to be welded, that is, within the width range of 2 to 3 mm from the edge of the manganese-boron steel plate substrate 3. For the temperature field, the length direction of the in-situ ...

Embodiment 2

[0040] In the aluminum-silicon-coated manganese-boron steel sheet involved in the present invention, the thickness of the aluminum-silicon alloy layer is 30 μm, the thickness of the aluminum-iron intermetallic compound layer is 10 μm, and the thickness of the manganese-boron steel sheet substrate is 2 mm. Using a high-frequency induction heating heat source to in-situ modify the surface coating within the width range of 1-2 mm from the edge of the manganese-boron steel plate, the temperature is heated to 850 ° C and kept for 5 minutes. During the heating and cooling process, the continuous flow rate is 20l / min nitrogen protection gas. Finally, the two coated manganese-boron steel plates after the in-situ surface modification above were butt welded by laser welding, the laser power was 4kw, the laser beam spot diameter was 0.6mm, the defocus amount was 0, and the welding speed was 6m / min.

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Abstract

The invention discloses a method for obtaining a whole martensite welding part of a coated manganese-boron steel plate, and relates to the field of material processing. The method is characterized bycomprising the following steps of 1, selecting a to-be-welded region on the edge of the coated manganese-boron steel plate; 2, carrying out in-situ modification treatment on the surface of the to-be-welded region to prepare a steel plate to be welded; and 3, welding the steel plate to be welded. According to the method, Al elements in the coating can be prevented from entering a welding molten pool in the welding process, and the weld seam mircostructure is obtained as a single martensite structure, so that the mechanical property is good, and meanwhile, the surface coating of the steel platedoes not need to be removed in advance, so that the early-stage processing cost is reduced, and the modification treatment process can be conveniently combined into an existing welding industrial production line, so that the working efficiency and the economic benefit are improved.

Description

technical field [0001] The invention relates to the field of material processing, in particular to a method for obtaining a fully martensitic welded part from a manganese-boron coated steel plate. Background technique [0002] Under the trend of automobile lightweight, automobile-related parts have higher requirements on material performance, and materials with excellent mechanical properties, good impact resistance and light and thin performance have attracted much attention. Compared with traditional vehicle materials, advanced high-strength steel plates have higher strength. Under the premise of ensuring the required performance, the thickness of the steel plate can be reduced to reduce the weight of the car body. It is a promising material in the field of vehicle manufacturing. Among them, manganese-boron steel is the most used, and the manganese-boron steel after hot stamping has a tensile strength of 1.5GPa-2GPa. In the actual production process of vehicle manufacturi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/082B23K26/21B23K26/60B23K26/70B23K35/38
Inventor 李芳华学明林文虎王琼燕张跃龙
Owner SHANGHAI JIAO TONG UNIV
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