Arc method for measuring orifice size of molten bath for plasma welding and signal acquisition system

A plasma welding and plasma arc technology, applied in the field of plasma welding quality control, can solve problems such as poor sensor accessibility, and achieve the effects of good accessibility and simple system structure

Inactive Publication Date: 2003-06-18
TSINGHUA UNIV
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  • Abstract
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Problems solved by technology

The biggest defect of these two detection methods is that the sensor must be placed on the back of the workpiece, which makes its popularization and application limited by the workpiece and production conditions, that is, the accessibility of the sensor is very poor

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  • Arc method for measuring orifice size of molten bath for plasma welding and signal acquisition system
  • Arc method for measuring orifice size of molten bath for plasma welding and signal acquisition system
  • Arc method for measuring orifice size of molten bath for plasma welding and signal acquisition system

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Embodiment Construction

[0031] A kind of arc detection method and signal acquisition system embodiment of the small hole size of the plasma welding pool designed by the present invention are described in detail as follows in conjunction with the accompanying drawings:

[0032] Considering changes in heat dissipation conditions, workpiece thickness, and welding specifications in actual production, the workpiece with a gradual thickness change is used. The thickest part of the workpiece is 8mm, and the thinnest part is 3mm. The welding specification is set so that the thickness of the workpiece is 6mm. , welded on stainless steel workpieces using an inverter welder. The shape of workpiece with gradient thickness and its corresponding weld backside are as follows: Figure 8 a and Figure 8 As shown in b, it can be seen that the weld seam on the back side grows from nothing and gradually becomes thicker. Obviously, the molten pool has experienced a process from never perforated to perforated from small ...

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Abstract

A signal acquisition system is used to real-time acquire the voltage and current signals of plasma arc, which are then stored in computer. After said signals are processed, the quantitative sensed signal aboutthe orifice size of molten bath, which can be recognized by machine, is obtained. After the sensed signal is scaled, said orifice size can be rel-time obtained on the basis of the relation between the sensed signal and the orifice size. Its advantages are simple structure, high and feasibility.

Description

technical field [0001] The invention belongs to the technical field of plasma welding quality control. Background technique [0002] Among the high-energy beams, the plasma arc has the advantages of easy implementation and low cost. It is one of the welding methods for important structures and alloy materials, and is especially widely used in aerospace systems. Utilizing the characteristics of high energy density and penetrating power of plasma arc, plasma welding can obtain "small hole effect" under appropriate parameter conditions, such as figure 1 As shown, at this time, the plasma arc completely penetrates the workpiece 10 and forms a small hole 12 penetrating the workpiece in the molten pool 11 by means of the plasma flow force, and the small hole moves forward following the plasma arc. The "pinhole effect" is a unique phenomenon in plasma welding, which helps to fully penetrate the weld. However, the fluctuation of various conditions and specifications in the actual ...

Claims

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Application Information

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IPC IPC(8): G01B7/02G01B7/13
Inventor 王海燕陈强王耀文
Owner TSINGHUA UNIV
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