Method for welding eccentric circumferential seams by using electron beam scanning

Abstract

The invention discloses a method for welding eccentric circumferential seams by using electron beam scanning. The purpose of the invention is to provide the method for welding eccentric circumferential seams, which is easy to control and has stable quality and high efficiency. The method is implemented by the following technical scheme: the oxide of the surfaces of the workpiecesparts to be welded on workpieces is first removed, and organic cleaning agent is used for cleaning the parts of the an eccentric circumferential seams; the workpieces to be welded, which have the eccentric circumferential seams, are assembled together and clamped on a three-jaw chuck; the scanning program of an electron beam welder is set to drive an electron beam in an electron gun to oscillate and revolve within a certain deflection angle range, so that a surface heat source is generated, electron scanning process parameters are set, i.e., the energy of the electron beam is rapidly increased to a peak value, the beam rise time is set as 1s to 2s, the beam welding and scanning time for keeping heating is set as 25s to 30s, the fall time is set as 10s to 12s, the scanning frequency is 400Hz to 600Hz, and under the process parameters, the scanning track of the electron beam is controlled and the workpieces scanned by the electron beam are heated, melted and welded at the seams.

Description

technical field [0001] The invention relates to an electron beam scanning welding method for an eccentric circular seam, in particular, it is suitable for welding an eccentric circular seam that is not concentric with a clamping position, and requires welding of a high-pressure sealing product with strong pressure and low leakage rate. Background technique [0002] The mounting plate assembly is a typical high-pressure sealing product on the aviation fuel measurement system, and its manufacturing accuracy directly affects the important characteristics of the fuel measurement system. Therefore, there are strict requirements on the connection of the mounting disk components. Generally, there are two main methods of connection of mounting plate components: overall machining and welding. Whole mechanical processing is adopted, the process is complicated, the manufacturing cost is high, and the production efficiency is low, which is not convenient for mass production. If the co...

AI Technical Summary

Problems solved by technology

[0003] Using the conventional electron beam welding method, the difficulty in welding the parts is that the four circular seams evenly distributed on the indexing circle are eccentric welds, which are not concentric with the clamping position. The conventional welding method—A-axis rotation requires a special eccentric fixture, clamping, Vacuuming four times, the production efficiency is extremely low

X-Y interpolation is adopted, because the electron beam spot is elliptical, the weld seam after interpolation is uneven, the shape is poor, it is difficult to withstand 20MPa pressure, and the leakage rate is greater than 1.33×10 -7 Pa·m 3 / s, the sealing effect is poor, it is difficult to effectively control the welding quality from the process parameters, and it is difficult to fundamentally solve the welding strength and sealing

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