On-line decision-making method of narrow-gap arc welding based on vision detection

Abstract

The method belongs to the technical field of welding detection, in particular to an on-line decision-making method of narrow-gap arc welding based on vision detection. In the method, a vision sensor is installed at one side of a narrow-gap welding material to carry out vision detection on narrow gap welding, and a vision detection system detects the position of the electric arc, the boundary of a welding line, the swing center of the electric arc, the swing amplitude, the angle of deviation in swinging and the touching side of the electric arc in real time in the narrow-gap welding process, therefore, a process decision is made. In the invention, automatic planning of a welding path and an electric arc track can be realized, the uniform depth of penetration of the narrow-gap welding is ensured, and early warning can be made when a solder wire touches the side, thereby current pulse can be properly increased when the electric arc touches the side, and the depth of penetration at two sides can be ensured.

Description

technical field [0001] The invention belongs to the technical field of welding detection, and in particular relates to an online decision-making method for narrow-gap arc welding based on visual detection. Background technique [0002] In narrow-gap arc welding, uniform penetration of the weld seam and penetration on both sides can be achieved through the swing of the welding torch. Ideally, the swing range and swing center of the welding torch can be reasonably set through a predetermined process to ensure narrow gap Uniform penetration and penetration on both sides, as shown in Figure 1(a). However, in reality, due to the distortion and deformation of the welding wire and the influence of thermal stress, the welding wire will have a certain random deflection when it is sent out from the welding tip (as shown in Figure 1(b)), which will cause the deflection of the arc movement, resulting in Local lack of penetration results in welding defects. These defects are difficult ...

AI Technical Summary

Problems solved by technology

However, in reality, due to the distortion and deformation of the welding wire and the influence of thermal stress, the welding wire will have a certain random deflection when it is sent out from the welding tip (as shown in Figure 1(b)), which will cause the deflection of the arc movement, resulting in Partial lack of penetration, resulting in welding defects

These defects are difficult to prevent through the pre-setting of the mechanism, so the random deflection can only be detected through online detection, and the welding process can be adjusted in real time

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