Method and device for improving formability of tailor-welded steel plate

A formability and steel plate technology, applied in heat treatment equipment, furnaces, heat treatment furnaces, etc., can solve the problems of product dimensional accuracy decline, energy waste, metal oxidation, etc., achieve the effect of less energy consumption, less energy consumption, and improved formability

Inactive Publication Date: 2013-02-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Elimination of welding residual stress through overall or partial high temperature tempering process may cause a series of problems such as metal oxidation at high temperature, energy waste and environmental pollution.
More importantly, in the case of large differences in the thermal expansion coefficients of the base metal on both sides of the weld seam of tailor-welded steel plates, it is likely to cause new internal stress after high-temperature tempering and cooling, resulting in a decrease in product dimensional accuracy and even introducing new potential hazards. factor

Method used

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  • Method and device for improving formability of tailor-welded steel plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method in the present invention is applied to equal-thickness laser-welded steel plates whose parent material is No. 45 high-quality carbon structural steel. The No. 45 high-quality carbon structural steel is water-quenched at 860°C and tempered at 180°C with a thickness of 1.0mm.

[0024] 1) According to the ferromagnetic properties of No. 45 steel plate and the welding direction, determine the reasonable magnetic treatment process parameters: the magnetic induction intensity of the low-frequency alternating magnetic field is 1.5T~1.7T, to ensure that the base metal of the tailor-welded steel plate reaches the magnetic saturation state, and the magnetic field frequency is 0.2 Hz~2Hz, the magnetic treatment time is 260s~300s, and the magnetic treatment direction is perpendicular to the weld seam.

[0025] 2) Place the tailor-welded steel plate in a low-frequency alternating magnetic field, and perform magnetic field stress relief treatment on it according to the abov...

Embodiment 2

[0029] The method of the present invention is applied to the equal-thickness laser welded steel plate whose base material is 30CrMnMoTiA. The thickness of 30CrMnMoTiA is 0.75mm after oil quenching at 875°C and tempering at 440°C.

[0030] 1) According to the ferromagnetic properties of 30CrMnMoTiA steel plate and the welding direction, determine the reasonable magnetic treatment process parameters: the magnetic induction intensity is 1.8T~2.0T, to ensure that the base metal of tailor welded steel plate reaches the magnetic saturation state, the magnetic field frequency is 7Hz~10Hz, and the magnetic treatment time It is 120s~180s, and the direction of magnetic treatment is the direction perpendicular to the weld seam.

[0031] 2) Place the tailor-welded steel plate in a low-frequency alternating magnetic field, and perform magnetic field stress relief treatment on it according to the above-mentioned magnetic treatment process parameters.

[0032] 3) Take out the tailor-welded s...

Embodiment 3

[0035] The method in the present invention is applied to the laser tailor welded steel plate whose parent material is DX56D+Z hot-rolled galvanized steel and DP600 hot-rolled dual-phase steel. DX56D+Z hot-rolled galvanized steel and DP600 hot-rolled dual-phase steel have been treated with stress relief annealing at 500°C, and the thickness is 0.75mm.

[0036] 1) According to the ferromagnetic properties and welding direction of DX56D+Z steel plate and DP600 steel plate, reasonable magnetic treatment process parameters are determined: the magnetic induction intensity is 2.0T~2.2T, which ensures that the base materials of the two tailor-welded steel plates reach magnetic saturation; the magnetic field frequency 2Hz~5Hz, the magnetic treatment time is 40s~80s, and the magnetic treatment direction is perpendicular to the weld seam.

[0037] 2) Place the tailor-welded steel plate in a low-frequency alternating magnetic field, and perform magnetic field stress relief treatment on it...

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Abstract

The invention relates to a method and a device for improving the formability of a tailor-welded steel plate. The method is characterized in that a tailor-welded steel plate after welding is placed in a low-frequency alternating magnetic field to be subjected to magnetic field destressing treatment, the treatment time is 20 s to 300 s, the magnetic induction intensity of the low-frequency alternating magnetic field ensures that all base metals of the tailor-welded steel plate can reach a magnetic saturation state, the frequency of the low-frequency alternating magnetic field is 0.2 Hz to 10 Hz, and the welding direction of the tailor-welded steel plate is perpendicular to the direction of the low-frequency alternating magnetic field. The device comprises an iron core (9), an excitation coil winding (1), a variable velocity variable frequency (VVVF) device (10), an alternating current power supply (11) and a clamp (3) used for clamping the tailor-welded steel plate (6). Through the application of the method and the device, the welding residual stress of the tailor-welded steel plate can be reduced effectively, the formability of the tailor-welded steel plate is improved, the advantages of energy conservation and environmental protection are achieved, and meanwhile, various bad consequences caused by traditional high temperature tempering and destressing manners can be avoided.

Description

technical field [0001] The invention relates to the field of tailor-welded steel plates, and more specifically, to a method and device for improving the formability of tailor-welded steel plates. Background technique [0002] With the continuous improvement of automobile lightweight requirements, tailor-welded steel sheets, especially laser-tailored welded steel sheets, have been widely used in the manufacture of automobile panels. However, the stamping formability of tailor-welded steel plates is much lower than that of ordinary steel plates. Improving the formability of tailor-welded steel plates has important scientific research value and engineering practice significance. [0003] An important reason for the decline in the formability of tailor-welded steel plates is that there are drastic temperature changes in the steel plates during welding and subsequent cooling, which causes very large welding residual stress in the weld seam and heat-affected zone. The tailor-wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D10/00C21D9/50
Inventor 宋燕利华林刘佳宁
Owner WUHAN UNIV OF TECH
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