Welding wire filling laser welding method utilizing non-oriented silicon steel

Abstract

A welding wire filling laser welding method utilizing non-oriented silicon steel includes steps of (1), taking plain carton steel with the silicon content smaller than 1.0% or low-grade non-oriented silicon steel as a leading tape for laser splice welding, taking non-oriented silicon steel with the silicon content ranging from 1.0%-3.5% as a base material for laser splice welding, cutting the tail of the leading tape and the head of the base material and the splicing the two together; (2), performing laser welding by a laser welder with the laser power of 5.0-9.0KW, the welding speed of 2.0-5.8meter / minute and the welding wire filling speed of 3.0-5.8meter / minute; and (3), selecting the plain carton steel with the silicon content smaller than 1.0% or low-grade non-oriented silicon steel as a leading tape after finishing welding, and then repeating the above steps to realize continuous productions. The welding wire comprises, by weight, C< / =0.10%, Si< / =0.85%, Mn< / =0.98%, P< / =0.015%, S< / =0.015%, Cr< / =0.013%, Al< / =0.010% and the balance being Fe; and helium gas is selected as a protective gas for protecting and cooling welded joints during laser welding.

Description

technical field [0001] The invention relates to laser welding technology, in particular to a laser wire-filling welding method for non-oriented silicon steel. Background technique [0002] In the cold rolling continuous production process, it is very important to weld the end of the forward hot-rolled strip to the head of the subsequent strip to form a weld, and then make it pass through the rolling line to form continuous rolling, which can greatly improve Productivity. At this time, if the quality of the weld is poor, the weld will break when passing through the rolling line, resulting in production interruption. Due to the high quality of laser welding, no contact, large aspect ratio, small deformation, beautiful welding, and the mechanical properties of the weld are basically consistent with the base metal, it is suitable for welding in many fields, especially steel strips. However, for silicon steel products, since the silicon content in the material is much higher th...

AI Technical Summary

Problems solved by technology

On the one hand, pre-weld preheating and post-weld annealing require new weld seam heating devices, which increases equipment investment and maintenance costs; on the other hand, pre-weld preheating and post-weld annealing are equivalent to increasing the process flow and prolonging the welding time. , which has a greater impact on the production capacity of continuous units

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