Laser welding method and laser welding device

Abstract

The invention discloses a laser welding method and a laser welding device, and is applied to the field of cold continuous rolling. The laser welding method comprises the steps that on the basis of the first preset matching relation, the current welding speed of a laser welding machine is adjusted to be matched with the thickness of current to-be-welded strip steel, and on the basis of the second preset matching relation, the current welding wire speed of the laser welding machine is adjusted to be matched with the thickness of the current to-be-welded strip steel, wherein the first preset matching relation represents the inverse correlation of the strip steel thickness and the welding speed of the laser welding machine, and the second preset matching relation represents the positive correlation of the strip steel thickness and the welding wire speed of the laser welding machine; the laser welding machine is started to weld a welding joint after the head and the tail of the current to-be-welded strip steel are cut. The technical problem that during rolling production of an existing DP980 steel ball in a continuous rolling unit, strip breakage happens is solved, and the continuous rolling production requirement is met.

Description

technical field [0001] The invention relates to the field of continuous cold rolling, in particular to a laser welding method and a laser welding device. Background technique [0002] High-strength DP980 steel is widely used in the automotive industry. The general tensile strength is not less than 980Mpa. It has stable mechanical properties and good formability. It can control the dimensional accuracy of parts more accurately and can apply various traditional welding methods. However, the production process of high-strength DP980 steel is complex and requires extremely high equipment, and it is generally produced in a single-stand rolling mill. In order to improve production efficiency, rolling production in the continuous rolling mill was considered. However, because the carbon equivalent and strength of DP980 steel exceeded the design capability of the strip cold continuous rolling laser welding machine, the quality of the welded joints could not be guaranteed, resulting i...

AI Technical Summary

Problems solved by technology

[0003] The embodiments of the present invention provide a laser welding method and a laser welding device, which solves the technical problem of the existing DP980 steel grade being broken during rolling production in a continuous rolling mill.

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