Welding process quality evaluation method for shielded metal arc welding

Abstract

The invention discloses a welding process quality evaluation method for shielded metal arc welding. Discrete welding voltage signals and discrete welding current signals are collected in a welding process, and low-frequency voltage signals and low-frequency current signals are obtained through wavelet transformation analysis. The welding process is divided into m equal time slots. The average value of the low-frequency voltage signals in each time slot is worked out and then the average value of m low-frequency current signal average values is worked out. A variation coefficient of the m low-frequency voltage signal average values is worked out and compared with a series of variation coefficients in a welding process judgment database, and a basic score of the welding process is worked out. Then, long short circuit time is adopted for correcting the basic score, and a final quantitative evaluation score of the welding process is obtained and serves as a basic criterion for reflecting operational capacity. The operating skills of welders can be judged objectively and standardly.

Description

technical field [0001] The invention relates to a technique for evaluating welding quality, in particular to a method for quantitatively evaluating the process of arc melting welding with electrodes. Background technique [0002] In electrode arc welding, the welder's operation technology is an important factor in determining the welding quality. Reliable welding operation technology is needed in important engineering projects to ensure the welding quality of the project. But so far, the screening of welding engineering project operators still relies on human subjective judgment. On the one hand, this method will cause adverse effects on the screening results due to subjective factors; In the process of change, it is difficult to simply rely on the referee's "naked eyes" to judge the defects of welding operation in the process of high-speed change. Therefore, there is still a lack of effective methods to quantitatively evaluate the operation level of welding workers. [00...

AI Technical Summary

Problems solved by technology

[0005] 1) Lack of in-depth research and understanding of arc physics

Especially in the operation of electrode arc welding, due to the individual characteristics of the operator, the method of transporting the rod, the welding position, and the welding technique are different, resulting in a very different arc shape, and its physical characteristics are also very different, so it is difficult to achieve effective welding. quantitative evaluation method

[0006] 2) During the welding process, different welding positions such as flat welding, horizontal welding, overhead welding, vertical welding and different joint forms such as tube-sheet butt joint, T-joint, groove form, etc., have brought great difficulties to the evaluation

[0007] At the same time, due to the lack of reliable standards, a mature rating standard for electrode arc welding operation level has not yet been established, which also brings certain difficulties to the quantitative evaluation of the welding process quality

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