OCT-based laser welding quality detection system for continuous welds of metal parts

Abstract

The invention relates to an OCT-based laser welding quality detection system for continuous welds of a metal piece. The system is used for performing continuous weld quality detection on a metal piece channel with more than three welds, and comprises a fastener (7) used for establishing connection with a pipe head of the metal piece (8) to be detected; and a driving assembly which comprises a cylinder body (1), a piston (3), a piston rod (2), a first rolling wheel (10), a second rolling wheel (11) and a limiting block (6), wherein the limiting block (6) is used for making contact with the abutting end of the cylinder body (1) to achieve limiting of the cylinder body after descending. A hydraulic system can be matched with a transmission mechanism to realize movement of a metal welding piece with relatively large mass so as to realize online detection operation of a welding seam.

Description

technical field [0001] The present application relates to the technical field of laser welding quality detection design, in particular to a weld detection applied to large-mass, long-tube or strip-shaped metal parts. Background technique [0002] In the practice of industrial production, metal parts are widely used in chemical industry, construction, engineering infrastructure and other fields due to their advantages of high strength and stability; Weld together to meet the length requirements; although the welding process can make the length of the metal parts meet the requirements, the existence of the weld also weakens the strength of the metal parts objectively; this requires the welding quality of the weld to achieve extremely high stability Insufficient welding quality and airtightness will lead to fracture or leakage due to insufficient strength of the connection between metal parts; once the problem occurs, because the working environment of metal parts is relatively...

AI Technical Summary

Problems solved by technology

[0002] In the practice of industrial production, metal parts are widely used in chemical industry, construction, engineering infrastructure and other fields due to their advantages of high strength and stability; Weld together to meet the length requirements; although the welding process can make the length of the metal parts meet the requirements, the existence of the weld also weakens the strength of the metal parts objectively; this requires the welding quality of the weld to achieve extremely high stability Insufficient welding quality and airtightness will lead to fracture or leakage due to insufficient strength of the connection between metal parts; once the problem occurs, because the working environment of metal parts is relatively complicated, and some even act on the ground, this will lead to repairing The repair work is very cumbersome and the counterfeiting is expensive; based on the above problems, for the inspection of welding quality, especially for the inspection of welding quality of a large-mass, long metal piece, an online inspection system that can take into account the inspection accuracy and economic cost is designed. It is of great significance for mass production and quality control of enterprises

[0003] In the prior art, the technical solution for weld seam detection based on OCT generally moves the scanning device on the interferometer, and uses the displacement of the scanning device to scan the weld seam; the OCT method of weld seam detection can improve the detection accuracy; however, for For long metal parts that are welded and formed by multiple groups of strip parts, if the metal parts are kept still, a large moving space is required by the scanning device's mobile scanning method; conventional OCT operation devices do not have such In the corresponding equipment production workshop, the mobile OCT operation device is used to scan long-distance continuous welds. Factors to be considered include the construction space, separate drive mechanism, displacement mechanism and corresponding protection mechanism for the scanning device; It brings about space occupation and protection of scanning devices, which will undoubtedly increase the cost; OCT components themselves also have high requirements on the working environment, and large-scale mobile scanning components will also cause excessive consumption of components

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