Laser welding method for producing a semi-finished sheet metal product from hardenable steel, comprising an aluminum- or aluminum-silicon-based coating

A laser welding and semi-finished product technology, applied in laser welding equipment, layered products, metal layered products, etc., can solve the problems of cost and time, and achieve the effect of optimizing the weld geometry and good homogenization

Active Publication Date: 2018-05-11
WISCO TAILORED BLANKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still very costly and time-consuming to remove the metal coating on the edge of the steel plate to be welded by laser or mechanical stripping.

Method used

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  • Laser welding method for producing a semi-finished sheet metal product from hardenable steel, comprising an aluminum- or aluminum-silicon-based coating
  • Laser welding method for producing a semi-finished sheet metal product from hardenable steel, comprising an aluminum- or aluminum-silicon-based coating
  • Laser welding method for producing a semi-finished sheet metal product from hardenable steel, comprising an aluminum- or aluminum-silicon-based coating

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Embodiment Construction

[0034] figure 1 Schematically shows parts of a laser welding installation with which the laser welding method according to the invention can be carried out. The device comprises a floor or a movable carrier plate (not shown) on which two slabs or plates 1 , 2 made of steel with different material qualities are placed. One of the sheets 1 , 2 is produced from a press-hardenable steel, preferably a manganese-boron steel, while the other sheet 2 or 1 is produced from a steel with softer deep-drawing properties, preferably a microalloyed steel.

[0035] A press-hardenable steel may, for example, have the following chemical composition:

[0036] max. 0.4% by weight C,

[0037] 0.4% Si by weight max,

[0038] 2.0% by weight Mn max,

[0039] 0.025% by weight P max,

[0040] max. 0.010% by weight of S,

[0041] max. 0.8% by weight Cr+Mo,

[0042] 0.05% Ti by weight max,

[0043] a maximum of 0.007% by weight B, and

[0044] minimum 0.015% by weight Al,

[0045] The rest is i...

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Abstract

The invention relates to a method for producing a tailored hot-formable semifinished sheet metal product. At least two steel sheets (1, 2') with different degrees of material quality and / or thicknessare joined together by a butt joint by means of laser welding. At least one of the sheets is made of a press-hardened steel and has an aluminum- or aluminum-silicon-based metal coating (1.1, 2.1). According to the invention, the steel sheets (1, 2') are welded to each other with a gap (G) which is delimited by the sheet borders to be welded together and which has an average width (b) of at least 0.15 mm. Filler wire (8) material is introduced into the gap (G) to such a degree that the proportion of the filler wire volume introduced into the gap (G) to the volume of the steel sheet material melted by the laser beam is at least 20%. The method according to the invention does not require the coating to be removed from the edges of the sheet borders to be welded together in advance and thus offers substantial cost advantages.

Description

technical field [0001] The invention relates to a method for producing custom-made thermoformable sheet metal semi-finished products, in which method at least two steel sheets of different material qualities and / or thicknesses are joined by laser welding in a butt joint, wherein the sheets At least one of them is made of press-hardenable steel and has an aluminum-based or aluminum-silicon-based metal coating, wherein the laser welding is performed while feeding the filler electrode into the welding melt produced only by means of at least one laser beam, wherein the The filler electrode is substantially free of aluminum and contains at least one alloying element promoting austenite formation in a mass fraction of at least 0.1% by weight in the filler electrode than in press-hardened steel, and wherein the filler electrode is transported Heating is carried out by means of a heating device before being introduced into the welding melt. Background technique [0002] Tailor-made...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/26B23K26/322B32B15/01B23K35/30
CPCB23K35/3066B32B15/012C22C38/04B23K2103/08B23K26/26C22C38/002C22C38/02C22C38/06C22C38/28C22C38/32C22C38/44B23K26/322B23K35/30B32B15/01B23K2103/04
Inventor 阿恩特·布罗伊尔克里斯蒂安·博特
Owner WISCO TAILORED BLANKS
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