Manufacturing method of aluminum-silicon coated steel/high-strength hot-formed steel composite steel part

A hot forming steel and manufacturing method technology, applied in the field of auto parts manufacturing, can solve the problems of increased welding difficulty, unstable production, short residence time of welding pool, etc., to enhance strength and toughness, improve strength and Toughness, the effect of improving mechanical properties

Inactive Publication Date: 2020-10-30
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution still has the following disadvantages: first, the requirements for the gap between the tailor-welded blanks are relatively high, and the gap is generally required to be no greater than 0.1t, which is equivalent to increasing the difficulty of welding; second, in the process of welding , if the aluminum in the coating enters the welding pool, there will still be a risk of segregation, resulting in instability in the production process; third, the residence time of the welding pool is very short, and the oxidation reaction of aluminum is limited, resulting in poor results

Method used

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  • Manufacturing method of aluminum-silicon coated steel/high-strength hot-formed steel composite steel part
  • Manufacturing method of aluminum-silicon coated steel/high-strength hot-formed steel composite steel part
  • Manufacturing method of aluminum-silicon coated steel/high-strength hot-formed steel composite steel part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The oscillating vibrating mirror welding method of aluminum-silicon coated steel / high-strength hot-formed steel comprises the following steps:

[0063] Step (1): Select 1.5mm thick aluminum-silicon coated 22MnB5 steel and 1.5mm thick 2GPa hot-formed steel, and use alcohol to degrease; the thickness of the aluminum-silicon coated 22MnB5 steel is 20 μm to 40 μm.

[0064] Step (2): Place the two steel plates on the workbench in the form of splicing, and use a special welding fixture to make the two steel plates closely contact.

[0065] Step (3): Use the IPG-6kW fiber laser to weld the test plate. The laser power used is 3.0kW, the welding speed is 5.0m / min, the swing diameter is 0.5mm, the swing frequency is 50Hz, and the defocus amount is +5.0mm, the protective gas used is 80% Ar+20% CO 2 , the spot path is shifted by 0.5mm from the two-plate splicing path to the 2GPa hot-formed steel side during welding.

[0066] Step (4): After the tailor-welded blank is obtained, it...

Embodiment 2

[0069] Oscillating laser welding of aluminum-silicon-coated steel / high-strength hot-formed steel includes the following steps:

[0070] Step (1): Select 22MnB5 steel with 2.0mm thick aluminum-silicon coating and 1.5mm thick 1800MPa hot-formed steel, and degrease with alcohol; the coating thickness of the 22MnB5 steel with aluminum-silicon coating is 20 μm to 40 μm.

[0071] Step (2): Place the two steel plates on the workbench in the form of splicing, and use a special welding fixture to make the two steel plates closely contact.

[0072] Step (3): Use the IPG-10kW fiber laser to weld the test plate. The laser power used is 10.0kW, the welding speed is 6.0m / min, the defocus is 0mm, the swing diameter is 6.0mm, and the spot direction is 1800MPa The steel side is offset by 2.5mm and the oscillation frequency is 50Hz. The protective gas used is 100% CO 2 , the moving path of the spot during welding is the splicing path of two steel plates.

[0073] Step (4): After the tailor-w...

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Abstract

The invention discloses a manufacturing method of an aluminum-silicon coated steel/high-strength hot-formed steel composite steel part. The manufacturing method comprises the following steps of fixingan aluminum-silicon coated steel plate and a high-strength hot-formed steel plate on a workbench in a splicing manner, and enabling the two steel plates to be in close contact; under the protective atmosphere, carrying out laser galvanometer welding on the butt joint position of the two steel plates, melting and solidifying at a butt joint position, thereby forming a high-quality weld joint; carrying out hot stamping on the welded steel plate to obtain an aluminum-silicon coated steel/high-strength hot formed steel composite steel part, wherein the protective atmosphere contains 5-100 vol.% of oxidizing gas, and during galvanometer welding, a moving path of a light spot is controlled to deviate by 0-3 mm towards one side of the high-strength hot-formed steel plate. According to the laserwelding method of the aluminum-silicon coated steel/high-strength hot-formed steel, under the condition of not removing an Al-Si coating, good connection between the Al-Si coated steel and other high-strength hot-formed steel can be achieved, the mechanical property of a welding joint is improved, and formation of delta ferrite in a welding seam is reduced;

Description

technical field [0001] The invention relates to the technical field of auto parts manufacturing, in particular to a laser welding method without removing aluminum-silicon coating steel and high-strength hot-formed steel. Background technique [0002] Automobile lightweight is an important development direction of modern automobiles, and reducing body weight is an important way to realize automobile lightweight. The use of advanced high-strength steel or ultra-high-strength steel in the body instead of ordinary steel can reduce the weight of the car while ensuring the safety of the car. Press-harden steel (PHS) is currently one of the strongest steels used for automobile body-in-white, and its tensile strength can reach more than 1500MPa. Hot-formed steel has ultra-high strength, which can well maintain the internal structure of the car body during a car collision to avoid serious injuries to passengers and effectively improve the safety performance of the car. In the produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/24B23K26/12B23K26/082B23K26/60B23K26/70C22C38/02C22C38/04C22C38/06C22C38/28C22C38/32C22C38/38
CPCB23K26/24B23K26/123B23K26/0821B23K26/60B23K26/70C22C38/04C22C38/02C22C38/28C22C38/06C22C38/38C22C38/32
Inventor 孙茜朱天才王晓南胡增荣孙立宁
Owner SUZHOU UNIV
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