A kind of high silicon steel laser welding method

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...

AI Technical Summary

Problems solved by technology

In the end, the mechanical properties of the weld are significantly reduced, which cannot meet the tension rolling requirements of silicon steel

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