MIG solder quality monitoring method based on electric arc multi-spectral coverage light information sensing

Abstract

A MIG welding quality monitoring method based on the electrical arc multiple-spectral-band light information uses the variation characteristic of the spectral information of the welding arc. Four characteristic spectrum bands (230-300nm, 370-450nm, 570-590nm and 800-830nm) are selected, the spectral information of the characteristic spectral band in the welding process are collected and convertedto electrical signal. The characteristic signal is extracted through the FFT filtering and is compared with the preset mathematic criterion for executing effective determination to the interference element in the welding process and realizing the real-time monitoring to the welding quality. Through the monitoring method of the invention, the monitoring to the a plurality of interference elements of wire feed rate variation, arc length variation, air amount variation, welding speed variation, surface condition of the weldment, exterior atmosphere interference, electrical arc shake and the like,and the welding quality problem caused thereby can be realized.

Description

technical field [0001] The invention belongs to the process control technology of molten electrode gas shielded arc welding (MIG welding), and relates to a quality monitoring method of MIG welding. The invention specifically relates to a MIG welding quality monitoring method based on arc multi-spectral optical information sensing. Background technique [0002] With the development of modern welding manufacturing technology, high-efficiency production methods such as welding robots have been widely used, and researchers have paid more and more attention to the inspection and control of welding quality brought about by automation. On-line welding quality inspection and control technology can not only reduce costs and improve production efficiency, but in many cases, post-weld non-destructive testing of large structures is not feasible, so online welding quality inspection technology is crucial for realizing high-quality and efficient welding important. [0003] For the detec...

AI Technical Summary

Problems solved by technology

However, there are still many problems in the above detection process: the sound signal is easily interfered and limited, and it is only used in the occasions where the light signal cannot play a role, such as submerged arc welding, or in laser and plasma arcs where the sound signal has obvious characteristics. , while relatively few for MIG welding applications

[0010] During the welding process, due to the droplet transfer and the arc length change in the normal welding process, the fluctuation of the welding arc spectrum will be caused, and the external interference factors will also cause the fluctuation of the arc radiation spectrum

The fluctuation of the same welding process may be caused by droplet transfer or interference factors. The effective identification of interference factors will be affected by droplet transfer fluctuations, which is far more complicated than TIG welding.

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