Automatic tracking control method for submerged-arc welding seam

Abstract

The automatic tracking control method for submerged-arc welding seam belongs to the field of automatic welding control technology. The technological scheme includes adopting welding arc as the sensor for detecting weld seam shape and position, obtaining the horizontal and vertical deviation information of the welding torch and weld seam from varying arc and voltage, and combining AC shaping, hardware and digital filtering, photocoupling and PWM technology. The deviation signal is processed in signal processing circuit, A / D converter circuit, sampling circuit, and monolithic computer circuit, control signal is output via the HSO port to control PWM generator circuit, and step motor is driven to regulate cross block for the arc to align the weld seam center and realize automatic seam tracking. The present invention has high accuracy, high anti-jamming capacity, high stability and reliability.

Description

technical field [0001] The invention relates to a welding technology, in particular to a control method for automatic tracking of submerged arc welding seams. Background technique [0002] Submerged arc welding is widely used in the manufacture of petrochemical equipment and pressure vessels. However, during the welding process, since the arc is buried in the flux, the arc and its weld seam cannot be observed with the naked eye. In order to ensure that the welding head is aligned with the center of the weld seam, the position must be adjusted before welding. Even so, because it is difficult to ensure that the groove gap is consistent when the workpiece is assembled, the welding wire cannot always be aligned with the center of the weld seam during the welding process. Therefore, automatic seam tracking of submerged arc welding has become an urgent problem to be solved. [0003] At present, four methods are mainly used for submerged arc welding seam tracking: one is the dire...

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Problems solved by technology

[0004] Among the above methods, the photoelectric sensor tracking system needs to draw a white line parallel to the weld in advance. When the weld is bent, the tracking accuracy cannot be guaranteed; the ultrasonic sensor tracking system has higher requirements on the metal surface. High, so that the scope of application is limited; the visual sensor tracking system is susceptible to welding spatter, smoke, arc flicker and rust, scratches and oxide scales on the workpiece, which affects tracking; and the above methods are quite costly due to the additional components high

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