Electron-bombardment welding technique

Abstract

The invention provides a vacuum electron beam welding process, which comprises a linear zooming welding control technology and welding parameters which can effectively eliminate black lines generated when the two materials of GH4169 and K4169 are combined for the electron beam welding, wherein the linear zooming welding control technology can be realized on a welding machine the electric parameters and mechanical parameters of which can be controlled by CNC; for the welding with abrupt change of cross-section, the mechanical position parameters are calculated, and the parameters of current and gathering current are controlled, thereby effectively eliminating the welding parameters under which the black lines are generated when the two materials of GH4169 and K4169 are combined for the electron beam welding, including direction, high pressure, high speed, critical beam flux, low frequency, triangular wave and medium amplitude. The welding process has the advantages that the welding process utilizes the characteristics of energy concentration, good formation of weld, high quality, little deformation after welding and the like of the electron beam welding, and changes the prior argon-arc welding process to the electron beam welding process, so as to improve the welding quality and reducing the welding deformation to the maximum degree.

Description

technical field [0001] The invention relates to the field of welding, and in particular provides a vacuum electron beam welding process. Background technique [0002] The rear casing of a certain type of turbine is an important load-bearing part of the turbine part of the engine. The center hole should support the turbine shaft. There are oil pipes and air pipes in the eight support plates. The structure is complex. very demanding (see figure 1 ), the applied materials are GH4169 and K4169. The casing is tailor-welded by thin plates (sheet metal parts, castings) and two mounting sides (forgings), with a diameter of Φ824mm. There are 34 argon arc welding seams on the casing, and the joints are prone to air holes, cracks and brittleness. At the same time, large stress and deformation will be formed in the welding area, making it difficult to achieve high-quality connections, resulting in two major problems after welding: [0003] a. Serious deformation cannot guarantee the ...

AI Technical Summary

Problems solved by technology

[0006] In view of the main technical key points and process difficulties targeted by this process technology research, technological research has been carried out mainly in the aspects of welding parameter optimization, material weldability test, welding process route layout, welding program control, etc. The main purpose is to effectively eliminate weld porosity and root forming defects, avoid the adverse effects of material "black line" defects, control and reduce welding deformation to the greatest extent, in order to achieve the highest quality welding quality and the most ideal dimensional accuracy after welding

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