Method for determining welding quality of longitudinal welded pipes

Abstract

The invention provides a method for determining welding quality of longitudinal welded pipes. According to the technical scheme, the method comprises the following steps: acquiring welded joint surface images of longitudinal welded pipes of different welding processes; detecting corresponding welded joint properties; dividing welding quality into N grades; preprocessing all the welded joint surface images marked with welding quality grades and extracting image feature values; establishing a BP neural network model between the welded joint quality grade of the longitudinal welded pipes and the image feature values of the corresponding preprocessed images by taking the welded joint quality grades of the longitudinal welded pipes as model output and taking the image feature values of the corresponding preprocessed images as model input; then substituting extracted image feature values of the welded joint surface images of the longitudinal welded pipes with to-be-determined welding quality into the established BP neural network model to obtain the welded joint quality grade of the to-be-determined longitudinal welded pipes. The method is accurate and reliable, and the welded joint quality of the longitudinal welded pipes can be evaluated and monitored in an online manner.

Description

technical field [0001] The invention belongs to the technical field of welding quality monitoring. Specifically, it relates to a method for determining the welding quality of straight seam welded pipes. Background technique [0002] Practice shows that: about 70% of the product quality problems of longitudinal welded pipes come from the welding production process. Therefore, the real-time monitoring of the welding quality of longitudinal welded pipes is very important to ensure the product quality of longitudinal welded pipes. However, in the production process of longitudinally welded pipes, the existing monitoring of welding quality is realized by the operator's observation and judgment, and manual adjustment of power output power or welding speed. Therefore, the quality of longitudinally welded pipes is affected by many human factors. Stability is often difficult to guarantee. The factors affecting the welding quality of straight seam welded pipes are very complicated. ...

AI Technical Summary

Problems solved by technology

However, in the production process of longitudinally welded pipes, the existing monitoring of welding quality is realized by the operator's observation and judgment, and manual adjustment of power output power or welding speed. Therefore, the quality of longitudinally welded pipes is affected by many human factors. Stability is often difficult to guarantee

The factors affecting the welding quality of straight seam welded pipes are very complicated. Although the X-ray, ultrasonic and other flaw detection equipment set up in the post-weld finishing process provide effective technical means for the on-line inspection of the welding quality of straight seam welded pipes, the distance between the installation position and the welding It is far away, so that it can only be used for post-inspection of welded pipe welding quality

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