Device and method for detecting electrical characteristics of laser welding small hole plasma
A detection device and plasma technology, applied in the directions of plasma, laser welding equipment, electrical components, etc., can solve the problems of devices and methods without plasma characteristics, and achieve long detection time, strong stability, and large detection range. Effect
Inactive Publication Date: 2017-07-25
TIANJIN UNIV
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Problems solved by technology
However, the current method of detecting plasma, whether using a photoelectric probe, a Langmuir probe or a passive electric probe, is limited to the plasma plume above the workpiece, and there is no method for detecting the plasma in the small hole under the laser deep penetration welding mode. Apparatus and method for bulk properties
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[0051] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.
[0052] as attached figure 1 -Shown in -5, laser welding pinhole plasma electrical characteristic detection device of the present invention comprises electric signal detection device, the first connecting wire, the second connecting wire, rheostat, amplifying circuit, data acquisition card and computer, wherein:
[0053] The electrical signal detection device is connected to the rheostat through the second connecting wire; one end of the first connecting wire is connected to the rheostat, and the other end is connected to the workpiece; the rheostat is connected to the amplifying circuit, the amplifying circuit is connected to the data acquisition card, and the data acquisition card is connected to the computer;
[0054] The entire electrical signal detection device is made of metal copper as a whole. The electrical signal detection device include...
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Abstract
The invention discloses a laser welding keyhole plasma electrical characteristics detection device and method. The detection device comprises an upper cover and a lower cover, wherein a detection mechanism, a water inlet nozzle, an air inlet nozzle, a water outlet nozzle, an air outlet nozzle and a connection pipe are arranged in the detection device; and an insulating layer is arranged on the bottom surface of the detection device and is used for insulating a workpiece and a welding line. The electrical characteristics detection device is utilized in a welding line laser welding process, and is connected with a computer through a varistor, an amplifier and a collection card; and an electrical characteristics signal of laser welding keyhole plasma is directly collected. According to the technical scheme disclosed by the invention, the laser welding keyhole plasma electrical characteristics detection device is relatively high in stability, relatively large in detection range, and relatively long in detection time, and has important practical significance in formation and evolution of keyholes in the laser welding process and online detection of the laser welding quality.
Description
technical field [0001] The invention belongs to laser processing technology, and more specifically relates to a detection device and method for detecting electrical characteristics of the plasma in the small hole and the plasma plume above the workpiece during the laser welding process. The meaning refers to the plasma in the small hole and the plasma ejected from the small hole under the condition of deep penetration welding. Background technique [0002] During the laser welding process, the high-energy laser beam interacts with the workpiece and the shielding gas to generate plasma, also known as laser plasma. Laser welding can be divided into two modes: heat conduction welding and deep penetration welding. Specifically, the plasma generated during laser deep penetration welding includes the plasma in the small hole and the plasma plume above the workpiece, which can be collectively referred to as plasma body. The plasma generated during the welding process has an impor...
Claims
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IPC IPC(8): H05H1/00B23K26/70B23K26/21
CPCB23K26/21B23K26/70H05H1/0018
Inventor 杨立军赵圣斌刘桐杨瑞霞刘莹何天玺
Owner TIANJIN UNIV