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Welding quality control system and method for arc temperature difference before and after plasma arc piercing

A plasma welding and control system technology, applied in plasma welding equipment, welding equipment, welding equipment, etc., can solve the problems that there is no standard for measuring the stability of the perforated molten pool, and there is no definite standard for evaluation, so as to improve welding efficiency, Good control and optimization of the results of the welding process

Active Publication Date: 2021-02-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no standard for measuring the stability of the perforated molten pool, and there is no definite standard for the stability of the perforated molten pool to evaluate the welding quality

Method used

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  • Welding quality control system and method for arc temperature difference before and after plasma arc piercing
  • Welding quality control system and method for arc temperature difference before and after plasma arc piercing

Examples

Experimental program
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Effect test

Embodiment 1

[0041] At first, the pre-welding work is ready, adjust the optical filter 9, the high-speed camera 8 and the welding plane to be on the same axis, and adjust the focal length, which remains unchanged during the welding process; after opening the ion gas cylinder 31 and the shielding gas cylinder Before switching 30 and cooling water tank 4, ensure that the welding torch and other necessary gas and water circuits are correctly connected during welding. According to requirements, various switches of the variable polarity plasma welding system 1 are turned on, and the acquisition window of the image processing unit 6 is opened at the same time. And in strict accordance with the requirements of variable polarity perforation plasma welding, the ion gas 26 is sent out in advance, and then the DC maintenance arc is started by high frequency; after the maintenance arc is stable, the shielding gas 25 is sent out, and the DC arc is started to preheat the workpiece; and then the variable ...

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PUM

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Abstract

The invention discloses a welding quality characterization and control system and method based on the arc temperature difference between the front and back sides of a variable polarity plasma arc. Add a specific narrow-band filter to the arc image. The entire arc image is filtered and symmetrized, and the temperature before and after the arc piercing is obtained by the standard temperature method, and the arc temperature difference between the front and the back is calculated, which is used to characterize the current welding quality. In addition, during the welding process, the temperature difference before and after the arc perforation is collected and calculated in real time and compared with the arc temperature difference of qualified welding quality, and the current welding arc temperature difference is adjusted in real time to within the error range of the qualified welding quality temperature difference, so as to realize plasma arc welding Performance characterization and control of quality.

Description

technical field [0001] The invention belongs to the field of welding quality control methods, and in particular relates to a welding quality characterization and control system and method based on the arc temperature difference between the front and back sides of a variable polarity plasma arc. Background technique [0002] The variable polarity perforating plasma arc is a new type of high-efficiency and zero-defect welding method developed for aluminum alloys. It combines the advantages of variable polarity TIG (non-melting gas shielded welding) and plasma high-energy beams, and reasonably distributes arc energy. In the case of melting the workpiece, removing the oxide film on the surface of the workpiece and discharging the pores in the welding joint at the same time, the burning loss of the tungsten electrode can be minimized, and the high energy density characteristics of the plasma beam can be effectively used. In the process, a perforated molten pool is formed to reali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K10/02B23K37/00
CPCB23K10/02B23K37/00
Inventor 陈树君闫朝阳蒋凡董善文
Owner BEIJING UNIV OF TECH
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