Method for welding low-grade non-oriented silicon steel through laser welding machine

Abstract

The invention discloses a method for welding low-grade non-oriented silicon steel through a laser welding machine. The method sequentially comprises the following steps that a steel band is centered; shearing is conducted; a lapping table is centered; secondary shearing is conducted; preheating is conducted; weld joint pre-levelling is conducted; weld joint welding is conducted; postheating is conducted; and weld joints are cooled. In the weld joint welding process, the laser focal distance of the laser welding machine is set to be -3 mm, and the welding speed is lowered when silicon steel with the thickness being greater than 3 mm is welded. According to the method, the laser focal distance value is fixed, the range of a weld joint heat affected zone is adjusted through speed, and the weld joint band breakage rate is effectively lowered; and meanwhile, secondary shearing is additionally conducted before welding for improving the weld toe section size, and thus the welding quality is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for welding low-grade non-oriented silicon steel with a laser welding machine. Background technique [0002] Laser welding is the use of high-energy laser pulses to locally heat materials in a small area. The energy of laser radiation diffuses into the interior of the material through heat conduction, and the material is melted to form a specific molten pool. It is a new type of welding method, mainly aimed at the welding of thin-walled materials and precision parts, which can realize spot welding, butt welding, lap welding, sealing welding, etc., with high depth-to-width ratio, small weld width, and small heat-affected zone. The deformation is small, the welding speed is fast, the weld seam is smooth and beautiful, no treatment is required or only simple treatment is required after welding, the weld seam quality is high, there is no air hole, it can be precisely cont...

AI Technical Summary

Problems solved by technology

[0005] Low-grade non-oriented silicon steel is generally designed with low-carbon steel components. Silicon and manganese elements are added to low-carbon steel to improve the magnetic properties of the steel plate, especially when the silicon content exceeds 1.0%. Welding performance declines, making it more difficult for the stable operation of the production line

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