Vacuum electron beam welding method for variable cross-section structure connecting plate for rail transit

By optimizing the welding path and controlling the electron beam energy in a vacuum electron beam welding method, the problem of welding instability in variable cross-section structural connecting plates for rail transit was solved, achieving high-quality welding and efficient production.

CN116984722BActive Publication Date: 2026-06-05CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
Filing Date
2023-06-30
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing welding methods are insufficient to meet the high-efficiency welding requirements of variable cross-section structural connecting plates for rail transit, resulting in unstable welding processes, defects such as internal porosity and surface pits, and low production efficiency.

Method used

By employing the vacuum electron beam welding method, optimizing the welding path and controlling the electron beam energy, and combining the arc-starting and arc-ending plates, the welding speed and electron beam current are adjusted in segments to achieve a stable transition of the molten pool and avoid the generation of defects.

Benefits of technology

It achieves good weld appearance, high welding process reproducibility, high welding yield, and reliable welding strength, making it suitable for mass production of connecting plates for rail transit.

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Abstract

The application discloses an electron beam welding method for a variable cross-section structure connecting plate for rail transit, and steps are as follows: 1) welding joint design; 2) cleaning the welding piece; 3) assembling; 4) electron beam positioning welding on the assembled connecting plate; 5) electron beam penetration welding, which is divided into three parts, i.e. equal thickness S1, circular arc transition S2 and thickness uniform change S3; 6) electron beam modification welding; and 7) post-welding heat treatment. The process design is reasonable, the welding quality meets the standard requirements, effectively solves the problems of internal pores, surface depression and large deformation, has the characteristics of good welding appearance forming, good welding process reproducibility, high welding yield, durable and reliable welding strength, easy engineering implementation and the like, realizes electron beam welding of the medium-thick steel plate with unequal-thickness variable cross-section and single-sided welding double-sided forming, and can fully meet the manufacturing requirements of the connecting plate for rail transit.
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