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Electric arc length automatic controlling means in tungsten electrode argon-arc welding

A technology of argon tungsten arc welding and arc length, which is applied in arc welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of affecting control accuracy, inconvenient operation, and poor anti-drying ability, and achieves simple control method, control High precision and sensitivity, adaptable effect

Inactive Publication Date: 2005-12-07
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the above two methods, CCD camera can obtain more weld seam information, but the whole system has poor anti-drying ability, large volume, inconvenient operation and expensive price
The sensitivity of air ultrasonic sensing is determined by the acoustic impedance matching between the ultrasonic sensor and the air medium, and different protective gases will affect the control accuracy

Method used

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  • Electric arc length automatic controlling means in tungsten electrode argon-arc welding
  • Electric arc length automatic controlling means in tungsten electrode argon-arc welding
  • Electric arc length automatic controlling means in tungsten electrode argon-arc welding

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Embodiment 1, the basic structure of the present invention can be divided into four parts: arc voltage signal processing circuit, single-chip signal processing, PWM generation circuit, stepper motor drive circuit. The AD output of the arc voltage signal processing circuit connected to the two output terminals of the welding machine is connected to the single-chip microcomputer, and the DA signal output of the single-chip microcomputer is connected to the PWM generation circuit and connected to the stepping motor driving circuit and connected to the stepping motor. It adopts the method of combining hardware and software, by using the external characteristics of the welding machine, that is, the arc length and arc voltage are in a linear relationship, and judging the arc length change by judging the arc voltage deviation, thereby realizing automatic control of the arc length. The arc voltage change is detected by the hardware circuit, and the arc length is adjusted when th...

Embodiment 2

[0017] Embodiment 2, the arc voltage signal processing circuit of the butt welding machine is preprocessed by the adaptive inductance circuit to obtain the linear relationship between the arc length and the output voltage; It is judged whether the arc is in arc ignition, arc extinguishment or normal welding state, and then integrates and filters the signal of the previous stage through the integral circuit to increase the driving capability output of the subsequent circuit. The self-adaptive inductance circuit compares and amplifies the arc voltage signal of the two output terminals of the welding machine with a given voltage, and then connects with a differential median circuit to control the inductance. When the high-frequency arc is struck, the inductance is in a strong saturation state, which avoids the influence of high-frequency and high voltage on the subsequent circuit, and at the same time ensures the reliability of the arc. When there is no high frequency and high vo...

Embodiment 3

[0026] Embodiment 3, the control panel is connected between the single-chip microcomputer and the PWM circuit. Connect the control panel between the single-chip microcomputer and the PWM circuit. When the deviation exceeds the allowable range, it can be set within a certain range through the control panel. After the time set by the control panel, the single-chip microcomputer DA outputs the corresponding deviation signal. Port P gives the motor rotation direction signal; when the deviation is within the allowable range, the single-chip DA has no signal output, and the motor does not move. refer to figure 1 with figure 2 , and the rest are the same as the above-mentioned embodiment.

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Abstract

The invention relates to a tungsten argon welding electric arc length automatic control method in the field of an electric arc length automatic control method of tungsten argon welding. The main points of technical project is as follows: it uses self-adaptive electric inductance control technique, pulsed orthopedic technique, digital filter technique and PWM control technique; AD samples the arc voltage signal of welding machine's two lead-out terminals after signal processing circuit, and outputs the result to single-chip machine; the DA signal output of single-chip machine is connected with PWM to generate circuit; the circuit is connected with step motor which is then connected with step motor. It adopts eight general industrial single-chip machine, outer hardware circuit and PWM control technique to compute the bias of arc length and adjust arc length according to the change of arc voltage.

Description

technical field [0001] The invention relates to an automatic control device for welding, in particular to a device which can be simultaneously used for automatic control of arc length in AC and DC tungsten argon arc welding. Background technique [0002] With the rapid development of modern society today, more and more aluminum alloys, stainless steel and other non-ferrous metals are welded, and the requirements for welding quality are getting higher and higher. The application range of argon tungsten arc welding continues to expand. Semi-automatic welding with arc length adjustment is difficult to meet the requirements of welding quality and welding efficiency. [0003] At present, in terms of automatic control of the arc length of argon tungsten arc welding, the methods to realize these functions are: CCD camera and air ultrasonic sensor. The principle of CCD camera is to use CCD camera combined with modern computer image processing technology to obtain clear and enlarged...

Claims

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Application Information

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IPC IPC(8): B23K9/095
Inventor 洪波袁灿屈岳波尹懿黄俊
Owner XIANGTAN UNIV
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