Laser welding method for high-grade silicon steel plate

A technology of laser welding and silicon steel plate, which is applied in laser welding equipment, welding equipment, furnaces, etc., can solve the problems of high weld seam breakage rate and high energy consumption, so as to improve weld seam quality, reduce energy consumption, and reduce welding The effect of stress

Active Publication Date: 2021-12-03
ZHANGJIAGANG YANGTZE RIVER COLD ROLLED PLATE CO LTD +2
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Problems solved by technology

[0011] Therefore, the technical problem to be solved by the present invention is to overcome the defects of high weld rate and high energy consumption in

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  • Laser welding method for high-grade silicon steel plate
  • Laser welding method for high-grade silicon steel plate
  • Laser welding method for high-grade silicon steel plate

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Embodiment

[0044] A laser welding method for high-grade silicon steel plates, comprising the following steps:

[0045] Step S1: Obtain the silicon content Si1 and thickness h1 of the front silicon steel plate, and the silicon content Si2 and thickness h2 of the rear silicon steel plate; wherein, the silicon content and thickness of the front silicon steel plate and the rear silicon steel plate must meet the following preset conditions at the same time : 4.0mm≤h1+h2≤5.5mm, 4.0%≤Si1+Si2≤6.4%, and │h1-h2│≤0.30mm, │Si1-Si2│≤0.5%.

[0046] Step S2: According to the range interval of the total silicon content (Si1+Si2) of the two silicon steel plates before and after, obtain the total silicon content (Si1+Si2) in the database corresponding to the total silicon content, welding speed and heating annealing power. The welding speed V and heating annealing power corresponding to the range interval of +Si2), the welding power P is calculated according to the welding speed V and the total thickness ...

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Abstract

The invention discloses a laser welding method for a high-grade silicon steel plate. The purposes are to improve the quality of a welding seam before a normalizing process and the quality of the welding seam after the normalizing process, avoid welding defects and cracks, reduce the strip breakage rate of the silicon steel plate in the continuous production process and improve the production efficiency. The Si content of the silicon steel plate is 1.75-3.45% in a mass ratio, and the thickness is 1.85-2.90 mm. The method is characterized in that the laser welding power and the heating and annealing power of a post-heating and annealing process are adjusted according to the total Si content (Si1 + Si2) and the total thickness (h1 + h2) of a front roll and a rear roll of high-grade silicon steel plates, and single-side splicing welding is achieved. According to the method, specific laser welding process parameters are provided according to the difference of the total Si content and the total thickness of the steel. By adopting the method, the weld microstructure can be improved, the hardness difference between a weld area and a base metal area is reduced, the welding stress is reduced, and the weld quality is improved; and in addition, the method further has the advantage of low welding energy consumption.

Description

technical field [0001] The invention relates to the fields of metallurgy technology and material science technology, in particular to a laser welding method for high-grade silicon steel plates. Background technique [0002] High-grade silicon steel refers to silicon steel with a silicon content exceeding 1.7% (mass ratio, the same below). Compared with ordinary silicon steel, the production of high-grade silicon steel requires a normalization process. In order to achieve continuous production, before the normalization process, it is necessary to use Welding technology connects the front and rear strips. Due to the high-grade silicon steel plate during the normalization heat treatment process, the internal grains become coarse, and the distribution of residual stress is uneven, which easily leads to broken belts in the furnace during the normalization process. At the same time, the wide application of the pre-rolling heating system enables some high-grade silicon steel sheet...

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Application Information

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IPC IPC(8): B23K26/21B23K26/60B23K26/70B23P15/00C21D1/26C21D9/50
CPCB23K26/21B23K26/60B23K26/702C21D9/50C21D1/26B23P15/00
Inventor 朱赫男岳重祥吴圣杰李慧
Owner ZHANGJIAGANG YANGTZE RIVER COLD ROLLED PLATE CO LTD
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