Laser welding method of high silicon steel

A technology of laser welding and high silicon steel, applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., which can solve the problems of decreased mechanical properties of welds and inability to meet the requirements of tension rolling of silicon steel strips.

Active Publication Date: 2016-10-26
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
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Problems solved by technology

In the end, the mechanical properties of the weld are significantly r...

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  • Laser welding method of high silicon steel

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Embodiment 1

[0032] Laser welding, using WLS series fiber laser, butt welding of silicon steel and silicon steel, the silicon content of silicon steel is 3.5%, warm rolled plate with a thickness of 0.28mm, pickling, cutting and grinding, clamp flattening, alignment, preheating, double-sided welding, The laser power is 140W and 170W respectively, the defocus is 30mm, the welding speed is 1.0m / min, the airflow is 15L / min, and the preheating temperature is 75°C.

[0033] Double-sided welding, no cracks in the weld, fewer defects on both sides of the weld, no weld leakage, uniform weld, and only a small amount of stress deformation in the middle part, avoiding the occurrence of weld leakage.

Embodiment 2

[0035] Laser welding, using WLS series fiber laser, butt welding of silicon steel and silicon steel, the silicon content of silicon steel is 6.5%, warm rolled plate with a thickness of 0.48mm, pickling, cutting and grinding, clamp flattening, alignment, preheating, double-sided welding, The laser power is 200W, 230W, the defocus is 30mm, the welding speed is 1.2m / min, the airflow is 15L / min, and the preheating temperature is 130℃.

[0036] Double-sided welding, no cracks in the weld seam, fewer defects on both sides of the weld seam, no weld leakage, more uniform weld seam, less weld deformation, beautiful weld seam, and avoid weld leakage.

Embodiment 3

[0038] Laser welding, using WLS series fiber laser, butt welding of silicon steel and silicon steel, the silicon content of silicon steel is 7%, hot-rolled plate with a thickness of 2mm, pickling, cutting, clamping, alignment, preheating, double-sided welding, The laser power is 730W and 890W respectively, the defocus is 30mm, the welding speed is 1.5m / min, the airflow is 20L / min, and the preheating temperature is 350℃.

[0039] Double-sided welding, no cracks in the weld, fewer defects on both sides of the weld, no weld leakage, uniform weld, small weld deformation, and beautiful weld.

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Abstract

The invention belongs to the field of the metallurgy technology and material science, and aims at providing a laser welding process method of brittle high silicon steel. Quick welding of strip tension rolling in the rolling preparation process of a high silicon steel thin strip is met. According to the mass ratio, an adopted alloy is prepared from 93%-96.5% of Fe and 3.5%-7% of Si; and the thickness ranges from 0.1 mm to 3.5 mm. According to the method, laser welding and a supplementary heat source are combined, and double-face or single-face welding is adopted; preheating carried out before welding is utilized for controlling the temperature rise speed, and heat preservation during welding and heat preservation carried out after welding are utilized for slow cooling to control the temperature reduction speed; and the temperature gradient and welding stress in the weld joint cooling process are reduced, and welding forming of the brittle high silicon steel is achieved. By means of the adoption of the method, cracks generated by the too high welding stress of the brittle high silicon steel can be avoided well, and the yield and the mechanical performance of the brittle high silicon steel are increased.

Description

technical field [0001] The invention relates to a laser welding technology for brittle high-silicon steel plates technical background [0002] High-silicon steel generally refers to silicon steel with a silicon content exceeding 3.5% (by weight, the same below). Compared with ordinary silicon steel (silicon content ≤ 3.5%), high-silicon steel, especially high-silicon steel containing 6.5% silicon, has higher resistivity and permeability, lower coercive force, and close to zero magnetic induction. The expansion coefficient and other characteristics, so it has low iron loss, which is of great significance to reduce energy consumption and noise. [0003] High-silicon steel is generally prepared into thin plates and processed into iron cores for transformers, motors, etc. During the preparation process of the plate, tension rolling is generally required to form a continuous plate and strip production. This requires continuous rolling of the plates welded together during the p...

Claims

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Application Information

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IPC IPC(8): B23K26/21B23K26/70
CPCB23K26/21B23K26/702B23K2103/04B23K2103/18
Inventor 叶丰梁永锋石祥聚林均品温识博刘斌斌
Owner UNIV OF SCI & TECH BEIJING
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