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Narrow-gap P-GMAW electric arc induction welding bead tracking method

A technology of P-GMAW and arc sensing, which is applied in the direction of arc welding equipment, welding equipment, manufacturing tools, etc., can solve the problem of no regression and achieve the effect of improving sensitivity

Active Publication Date: 2018-07-20
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above studies are all trying to improve the sensitivity of arc sensing from the perspective of signal processing and control methods to improve the tracking control accuracy, and have not returned to the essence of the physical process of narrow gap welding to deeply study the reasons why narrow gap welding affects the accuracy of arc sensing. analyze

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  • Narrow-gap P-GMAW electric arc induction welding bead tracking method

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Embodiment Construction

[0026] Further describe the present invention below in conjunction with embodiment and accompanying drawing thereof:

[0027] Digging effect: During the narrow gap P-GMAW experiment of the swinging torch, we found that when the welding torch swings to the sidewall position, the peak value of the pulse current gradually increases when the welding torch moves towards the sidewall, and when the welding torch reaches the sidewall and moves backward , the drop rate of the peak current is significantly faster than the rise rate. In order to eliminate the influence of mechanical error caused by screw wear, the above phenomenon still exists after replacing the high-precision ball screw.

[0028] Such as figure 1 As shown, the peak current is further extracted to draw the curve. It can be clearly seen from the figure that the decreasing speed of the peak current when the welding torch leaves the side wall is obviously higher than the rising speed when the welding torch moves towards ...

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Abstract

The invention disclose a narrow-gap P-GMAW electric arc induction welding bead tracking method which is applicable to narrow-gap welding with a bevel angle smaller than 10 degrees; a welder P-GMAW mode is selected; current values are sampled according to a sampling frequency through a current sensor; peak value current of each pulse cycle is extracted from current signals subjected to average filtering; a peak value current changing rate when a welder is far away from side walls at left and right limiting positions; the displacement value of the welder is calculated according to the formula that dev equals k(kL / kR); the calculated welder displacement value dev is transmitted to a welder swinging rectifying control system to control welder rectifying; and welding beam tracking control is realized. Through analysis on signal features in a narrow-gap P-GMAW welding process, the invention discloses the novel electric arc induction welding bead tracking method, and sensitivity of electric arc induction of the narrow-gap P-GMAW welding process is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of mechanical automatic control, and in particular relates to a narrow-gap P-GMAW arc sensing welding seam tracking method. Background technique [0002] During the swing or rotation of the welding torch, the distance from the contact tip to the workpiece is affected by the shape and position of the groove, and its length changes regularly. This change can be reflected by the change of the arc signal and used to monitor and control the position of the welding torch, which is the seam tracking technology based on arc sensing. [0003] Seam tracking control includes sensing and controlling the height and centering of the welding torch. The technical scheme of arc sensor for seam tracking was first proposed by Eichhorn F and Platz J of Aachen University of Technology in Germany. However, due to the stability of the welding arc, arc sensor seam tracking has not been widely used. With the continuous advancement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/127
CPCB23K9/127
Inventor 刘文吉李亮玉岳建锋颜培玉
Owner TIANJIN POLYTECHNIC UNIV