Method for direct omnidirectional observation of plasma in penetration fusion welding small holes of metal material

Abstract

The invention provides a method for direct omnidirectional observation of plasma in penetration fusion welding small holes of a metal material. A composite specimen is used and includes a metal specimen on the upper portion and a GG17 specimen on the lower portion, and n-degree included angle exists between the combination surface of the metal specimen and the GG17 specimen and the top surface ofthe composite specimen, wherein n is larger than zero and smaller than 90 degrees. The method includes the following steps that 1, the top surface of the composite specimen is located in a horizontalplane, a welding head is arranged on the upper portion of the composite specimen, the incident direction of the laser or electron beams of the welding head is vertically downward, and spectral signaldetection component including an optical fiber and a spectrometer is arranged; 2, the welding head is started for penetration fusion welding of the composite specimen, and the welding direction is thedirection, perpendicular to an intersection line L, in the horizontal plane. The provided method can be used for direct omnidirectional observation of plasma in the small holes, no blind angle of observation exists, and the accurate in-hole plasma parameter is provided for study of plasma inverse bremsstrahlung absorption.

Description

technical field [0001] The invention relates to the field of deep penetration welding, in particular to a method for omnidirectional direct observation of plasma in small holes of deep penetration welding of metal materials. Background technique [0002] As a high-quality and efficient welding method, deep penetration welding (including laser, electron beam, etc.) has the advantages of fast welding speed, large weld depth-to-width ratio, small heat-affected zone and welding deformation, and is widely used in steel, nuclear power, aerospace, etc. It has been more and more widely used in major military and civil projects such as railway transportation, automobile, electronic industry, etc., especially in the lightweight of transportation vehicles (welding of thin-walled components and lightweight materials such as aluminum and magnesium alloys). play an increasingly important role. [0003] (1) Current status of small hole observation technology [0004] The essential featur...

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Problems solved by technology

However, this method has a significant disadvantage: the metal film layer used for welding is a loose structure, which is very different from the actual situation of the dense workpiece used for welding, because the loose multi-layer aluminum film has a deep impact on the laser. The influence of heat transfer, mass transfer and laser energy absorption and transmission process in the fusion welding process is very different from the dense aluminum alloy materials used in engineering practice. The actual situation of the material is very different

[0011] To sum up, in the prior art, there is neither a device and method that can directly observe the shape of the small hole in the deep penetration welding of the metal material, nor a method that can directly observe the shape of the small hole in the deep penetration welding of the metal material. There is no device and method for direct observation of plasma distribution in all directions, and there is also no composite test piece that can be used for direct observation of small holes in deep penetration welding of metal materials.

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