Differential measurement method and device for arc current density

A technology of differential measurement and arc current, which is applied in the direction of current density measurement, etc., can solve the problems of missed detection and jumping, and achieve the effects of preventing missed detection and sudden change, saving costs, and improving data accuracy

Active Publication Date: 2012-09-19
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems of missing detection and jumping in the prior art, and provide ...

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  • Differential measurement method and device for arc current density
  • Differential measurement method and device for arc current density
  • Differential measurement method and device for arc current density

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Embodiment Construction

[0022] The present invention is a test method for arc current density distribution, and the test system also includes a TIG welding machine, a space wave module 12 and a computer processing system 13 . The second motor 1 is connected with the second leading screw 8 and then connected with the motion auxiliary block 7, and the welding torch is fixed on the workbench 9 and is perpendicular to the current sensor 6, as figure 1 shown.

[0023] The arc is generated by the circuit formed between the TIG torch and the upper receiving copper plate 4. The upper receiving copper plate 4 is installed on the top of the current sensor 6, and the upper receiving copper plate 4 absorbs heat to protect the current sensor 6 from direct contact with the arc 3 for a long time. The outer layer of the current sensor 6 is made of aluminum alloy, which shields external interference signals and ensures that the internal signals of the current sensor 6 are provided by the penetration part of the slit ...

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Abstract

The invention relates to a differential measurement method and device for arc current density. An electrical arc performs periodical scanning on a current sensor, an upper reception copperplate is installed on the current sensor, a fine seam is processed at the centre of the upper reception copperplate, the scanning direction of the electric arc in each scanning process is parallel to the direction of the fine seam, a current signal through the fine seam is received and exported by the current sensor to be used for collection and storage. According to the differential measurement method provided by the invention, the fine seam is adopted to replace two parallel anodes in the original anode split method so as to improve the measurement accuracy in the scanning direction and effectively prevent defects such as detection omission or sudden change arising in the moving process of the electric arc between the two anodes. The differential measurement method provided by the invention does not need to make hypothesis on shapes of the electric arc spots, so that the problem of the difference between sizes of the electric arc spots in static state and dynamic state can be solved, and the non-circular electric arc current density distribution can be measured accurately.

Description

technical field [0001] The invention belongs to the technical field of arc processing, in particular to a differential measurement method and device for arc current density, which is suitable for quantitative analysis of arc current density. technical background [0002] Arc heat source and plasma arc heat source are commonly used welding heat sources at present, and are widely used in welding engineering. The heating of the arc and the phenomenon of the heating process are closely related to the energy density distribution of the arc. The arc energy directly affects its interaction with materials. [0003] At present, the main methods used at home and abroad are probe method, ablation method and split anode method. [0004] The ablation method relies on the traces of the arc ablated on the material after the arc is ablated on the material to analyze the arc energy density. This method requires high experience in the process of use, and the experimental results vary with di...

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Application Information

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IPC IPC(8): G01R19/08
Inventor 周琦景岩周芷兰王克鸿周彦松彭勇冯曰海朱军黄俊张德库章晓勇
Owner NANJING UNIV OF SCI & TECH
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