Method for eddy current sensing welding seam automatic following control of front dual probes

An automatic tracking, eddy current sensing technology, applied in manufacturing tools, welding equipment, arc welding equipment, etc., can solve the problems of low manufacturing cost, difficult to guarantee accuracy, poor real-time performance, etc., to simplify the calculation process and circuit structure, reduce the system Cost, control the effect of stable operation

Active Publication Date: 2014-10-01
XIANGTAN UNIV
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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.

Method used

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  • Method for eddy current sensing welding seam automatic following control of front dual probes
  • Method for eddy current sensing welding seam automatic following control of front dual probes

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Experimental program
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Embodiment 1

[0014] Embodiment 1. The present invention adopts a control system including a dual-probe eddy current sensor installed on a welding torch, a welding execution device and a welding control device, and combines the application of the non-contact linearized measurement characteristics of the dual-probe eddy current sensor to realize a dual-probe eddy current sensor. In the sensor-type welding seam automatic tracking control method, the welding execution device in the control system includes a welding power supply and a welding torch 5 connected to the welding control device. The welding torch 5 is aimed at the butt weld, that is, the butt metal plate 4. The welding control device mainly includes Double-probe eddy current sensor, pre-processor, welding trolley 3 and cross slider 6, the double-probe eddy current sensor is placed in front of the welding torch 5 and placed on the groove side, the double-probe eddy current sensor has two probes, and the probe Ⅰ1 passes through the heig...

Embodiment 2

[0015] Embodiment 2, the pre-processor is provided with a signal processing circuit, an A / H conversion circuit, a single-chip microcomputer processing circuit, and a drive control circuit to perform pre-processing on the input current. The signal collected by the double-probe eddy current sensor is converted into a voltage signal output. During the processing process, it is first processed by the signal processing circuit and the A / H conversion circuit, and then sent to the single-chip processing circuit for software processing and calculation. The single-chip processing circuit The adjustment signal is given and the welding actuator is controlled by the drive control circuit to achieve position control and real-time adjustment between the welding torch 5 and the workpiece-conductor surface, thereby realizing automatic welding seam tracking. refer to Figure 1 to Figure 2 , all the other are with embodiment 1.

Embodiment 3

[0016] Example 3, the two probes of the eddy current sensor can compensate each other, the voltage changes of the probe I1 and the probe II2 of the dual-probe eddy current sensor are used for surface fitting through lstopt, an appropriate surface equation is selected, and then the variables are separated, and the probe I1 is The height is compensated to the probe Ⅱ2, eliminating the influence of the distance H on the probe Ⅱ2, capturing the height and position information of the welding torch 5 and the weld seam, first converting the sampling signal into a digital signal and inputting it into the single-chip processing circuit, and then using Fuzzy according to the deviation of the weld seam —PID control adjusts the welding torch 5 to realize automatic tracking of the welding seam by the welding torch 5. refer to Figures 1 to 2 , and the rest are the same as the above-mentioned embodiment.

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Abstract

A method for eddy current sensing welding seam automatic following control of front dual probes mainly solves the technical problems that a control system of an existing traditional welding seam tracking sensor is complex and the existing traditional welding seam tracking sensor has complexity in calculation, is low in control precision, huge in size and large in noise, abrades easily and is high in cost and narrow in applied range, and misalignment influence in the welding process can be eliminated or weakened. The technical scheme is that after an input current of a dual probe eddy current sensor is subject to early treatment of each circuit in a preprocessor, the input current reaching a head coil impedor Z of the dual probe eddy current sensor, a measured value of a coil, the distance H between metal plates and a variation value of the relative area S form a voltage value signal U to be output, and accordingly linear relations between U and H and between U and S in the welding process are obtained to achieve welding seam automatic following control. The method is mainly used for welding seam automatic following of an automatic control system in the welding process.

Description

technical field [0001] The invention relates to a welding control method, in particular to a double-probe eddy current sensor type welding seam automatic tracking control method used for automatic welding seam tracking in a welding process. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/127
CPCB23K9/1276
Inventor 洪波廖亚华洪宇翔朱亚飞
Owner XIANGTAN UNIV
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