Non-penetrating welding method of feed components through electron beams

Abstract

The invention discloses a non-penetrating welding method of feed components through electron beams. According to the non-penetrating welding method, the needed technological process is simple, efficiency is high, deformation is little, welding seams are regular, welding precision is high, and the product percent of pass can be 100%. The non-penetrating welding method is realized through the technical scheme that in the welding process, scanning waveforms of the electron beams are set to be oval, the scanning amplitude in the X direction is set to be 2 mm to 3 mm, the scanning amplitude in the Y direction is set to be 4 mm to 6 mm, the scanning frequency is set to be 80 Hz to 100 Hz, the acceleration voltage is set to be 50 kV to 60 kV, the beam current is set to be 10 mA to 15 mA, the focus current is set to be 800 mA to 900 mA, any one set of specific values of is selected from the process parameters, the beam slope is set to be in an isosceles trapezoid shape, ascending time and descending time of the electron beams are both set to be 3s to 5s, and the welding seams are welded in a deflection scanning mode; the electron beams penetrate through feed pieces on a sleeve pipe to weld the feed pieces and the sleeve pipe under the feed pieces together. The non-penetrating welding method solves the problems that a conventional welding process is complex, thermal deformation is serious, and burning through and open solder are likely to happen.

Description

technical field [0001] The invention relates to an electron beam non-penetrating welding method for a power feed assembly, in particular to the electron beam non-penetrating welding which is suitable for parts structure design requirements. Background technique [0002] The feed assembly is a typical product on the fuel measurement and control system, and its manufacturing accuracy directly affects the important characteristics of the fuel measurement and control system. Therefore, there are strict requirements on the welding of feed components. Generally, there are two main processing methods for welding feed components: brazing and fusion welding. As the last process, there is no residual processing after welding, so the requirements for welding deformation control are strict, and the weld seam is not allowed to penetrate the casing, otherwise the feeder cannot pass through. Using the conventional welding method—brazing, the output heat is too large, the heat-affected zo...

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Problems solved by technology

Using the conventional welding method—brazing, the output heat is too large, the heat-affected zone is too wide, and the welding deformation is serious. It cannot meet the design requirements of post-welding symmetry and flatness not greater than 0.1 mm. It is difficult to evaluate the welding quality from the process parameters. Effective control, unable to fundamentally avoid welding deformation, resulting in scrapped parts

The conventional electron beam welding method is adopted for the power feed assembly. The electron beam power density is too high, the penetrating power is too strong, and the energy is too concentrated. There is a concave defect on the surface of the section. The main reason for this defect is that the weld is too long, the heat capacity is relatively small, and the temperature rise of the parts varies greatly in different time periods during the welding process, especially in the second half of the welding seam. Due to the heating of the electron beam welding process and the heat conduction of the first half of the weld, the temperature of the parts has been higher, the melting amount of the weld metal is larger than that of the first half, the weld is formed wider than the first half and forms a depression of different depths, resulting in The deformation of the parts after welding is serious, and the symmetry and flatness cannot be controlled within 0.1mm. When the welding depth exceeds the seam line, local burn-through and welding leakage are very easy to occur, resulting in the scrapping of the parts

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