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Tailor-welded pre-coated steel sheet and its hot-stamped components

A technology of hot stamping and laser tailor welding, which is used in layered products, welding equipment, metal layered products, etc.

Active Publication Date: 2021-04-27
IRONOVATION MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] While these two patents no longer require the removal of pre-coated metal alloy layers, they either use a complex laser-torch combination or introduce additional elements to solve the problem

Method used

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  • Tailor-welded pre-coated steel sheet and its hot-stamped components
  • Tailor-welded pre-coated steel sheet and its hot-stamped components
  • Tailor-welded pre-coated steel sheet and its hot-stamped components

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Embodiment Construction

[0061] The present invention will be described in more detail below with reference to exemplary embodiments. The following examples or experimental data are intended to illustrate the present invention, and it should be clear to those skilled in the art that the present invention is not limited to these examples or experimental data. In addition, the descriptions about the contents of chemical elements in the text all refer to percentages by weight.

[0062] The main chemical composition of the matrix steel plate that the present invention adopts is described in detail as follows:

[0063] C: about 0.08wt%~0.45wt%,

[0064]C is the most effective solid solution strengthening element in steel. In order to ensure the tensile strength of the steel is above 1000MPa, the carbon content is required to be greater than or equal to about 0.08wt%. However, if the carbon content exceeds 0.45wt%, its microstructure is mainly brittle high-carbon martensite, its ductility and toughness ar...

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Abstract

This application relates to laser tailor welding of pre-coated steel sheets and their hot stamped components. Tailor-made laser welding of pre-coated steel plates includes a first pre-coated steel plate, a second pre-coated steel plate and a weld between the edges of the two, wherein the composition of the weld in percent by weight makes the weld bead in an equilibrium state Fully austenitized temperature A e3 Satisfied: A e3 =898‑30× C Mn‑weld ‑231× C C‑weld +58× C Al‑weld 2 +37× C Al‑weld ≤820. The present invention controls the composition of the weld seam by controlling the composition and thickness of the base steel plate and its pre-coating thickness, so that no additional auxiliary means need to be utilized during laser welding. Welds of hot-stamped formed components made from laser-welded pre-coated steel sheets have improved properties for increased crash safety.

Description

technical field [0001] The present invention relates to a laser tailor-welded pre-coated steel sheet obtained by laser tailor welding and a hot stamping formed member made thereof, wherein the pre-coated steel sheet is a pre-coated steel sheet for hot stamping with an aluminum or aluminum alloy pre-coating . Background technique [0002] In recent years, with the urgent need for energy saving and environmental protection and the improvement of automobile safety requirements, automobile lightweight and safety have become urgent problems to be solved in the automobile manufacturing industry. In order to solve these two problems, more and more technicians are paying attention to ultra-high-strength steel, especially hot stamping steel with aluminum-silicon coating, which has obvious advantages in anti-collision performance and other aspects, and has become a guarantee of safety. And the direction of weight reduction. [0003] In automobile manufacturing, the laser tailor weld...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/01B32B15/18B23K31/12C22C38/06C22C38/04
CPCB32B15/011B23K31/12C22C38/06C22C38/04B23K2101/185B32B15/012C22C38/58C22C38/54C22C38/02C22C38/44C22C38/48C22C38/50C22C38/46B23K26/0006B23K26/24B23K2101/34B23K2103/04B32B37/0084B32B2310/0843B32B2038/0096
Inventor 易红亮李峥先崔青玲周澍李世宇熊小川王国栋
Owner IRONOVATION MATERIALS TECH CO LTD
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