Eddy current sensor type automatic weld tracking control method

Abstract

The invention relates to an eddy current sensor type automatic weld tracking control method, which comprises a welding execution unit and a welding control unit, wherein the welding execution unit comprises a welding power supply and a welding gun, the welding control unit comprises eddy current sensors, a preprocessor, a welding tractor and a cross slider, and the preprocessor is provided with a signal processing circuit, an A / D conversion circuit, a singlechip processing circuit and a drive control circuit. After being preprocessed by each circuit in the preprocessor, the input current of the eddy current sensor arrives at the head coil impedance Z of the eddy current sensor, the output of a voltage signal U is generated according to the variation values of the measured value of the coil and the distance D between metal plates, and thereby automatic weld tracking control is realized according to the linear relation between U and D in the process of welding. The method overcomes the defects of the usage of the conventional weld tracking sensor, such as complex control system, complex operation, low control precision, large size, high noise, easy abrasion, high cost and narrow application range; and the method is applicable to the automatic weld tracking of an automatic welding process control system.

Description

technical field [0001] The invention relates to a welding control method, in particular to an eddy current sensor type welding seam automatic tracking control method used for automatic welding seam tracking in welding technology. Background technique [0002] The main problems to be solved by the welding process automatic control system are the automatic tracking of the welding seam and the automatic control of the welding torch. At present, the more common seam automatic tracking sensors include laser vision, mechanical contact and arc sensors. In the system, the arc itself is used as a sensor, which has strong real-time performance and low manufacturing cost, but the control accuracy is not too high, the volume is large, and the noise is large. Although the control accuracy of the laser sensor is relatively high, its cost is high and its application range is narrow. In some occasions, even laser tracking is difficult to meet the requirements. Contents of the invention ...

AI Technical Summary

Problems solved by technology

At present, the more common seam automatic tracking sensors include laser vision, mechanical contact and arc sensors. In the system, the arc itself is used as a sensor, which has strong real-time performance and low manufacturing cost, but the control accuracy is not too high, the volume is large, and the noise is large

Although the control accuracy of the laser sensor is relatively high, its cost is high and the scope of application is narrow. In some occasions, even laser tracking is difficult to meet the requirements.

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