A Method of On-line Identifying Deviated State of Incident Laser

A state, laser technology, applied in laser welding equipment, welding equipment, metal processing and other directions, can solve the problems of limited application, high price, weakening the mechanical properties of sandwich structures, etc., to achieve the effect of wide application and simple installation
CN103909348BActive Publication Date: 2015-11-25SHANGHAI JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI JIAOTONG UNIV
Publication Date
2015-11-25

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Abstract

The invention discloses a method for identifying a deviation state of incident laser in an online manner. The method is used for carbon dioxide laser welding on metal plates which are of sandwich structures. The method includes shooting light-induced plasma cloud images by the aid of a high-speed camera in welding procedures; computing feature parameters of the plasma cloud images; computing process statistic quantities of the feature parameters of the images in set time periods; determining comprehensive indexes by the aid of a principle component analysis process; judging a position deviation degree of the incident laser according to the comprehensive indexes. The method has the advantages that the position deviation state of the incident laser can be accurately and quickly judged in the dioxide laser welding procedures for the metal plates which are of the sandwich structures, devices are simple, interference on the laser welding procedures can be prevented, and the method can be widely applied to the field of carbon dioxide laser welding on metal plates which are of sandwich structures.
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Description

technical field

[0001] The invention relates to the technical field of carbon dioxide laser welding, in particular to a method for on-line identification of incident laser deviation states during carbon dioxide laser welding of sandwich-structured metal plates. Background technique

[0002] As a lightweight structure, sandwich steel plate has the advantages of light specific gravity, good rigidity, and strong impact resistance. It is widely used in the fields of ships, bridges, and buildings. Usually, the panel and the core plate of the sandwich structure are connected by high-power laser welding of the T-shaped joint, that is, the laser is irradiated on the panel, reaches the core plate through the keyhole on the panel and causes the core plate to melt, and finally forms the panel and Welding between core plates. This special welding method requires the incident laser to be aligned with the center line of the core plate, but in the actual production process, factors such a...

Claims

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