A welding method for multi-cavity structures of ultra-high-strength steel based on discrete stress distribution
An ultra-high-strength steel, discretely distributed technology, applied in welding equipment, electron beam welding equipment, metal processing equipment, etc., can solve the problems of cracking in the heat affected zone, workpiece deformation, rigid constraints, etc., to achieve effective welding deformation control, reduce Temperature gradient, effect of reducing welding heat input
Active Publication Date: 2021-05-11
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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Problems solved by technology
For the manufacture of multi-cavity structures, the use of welding to connect the cover plate and the cavity is undoubtedly more advanced than riveting; There is mutual influence between them, and there is a large shrinkage deformation of the weld; due to the gradual accumulation of heat, the entire workpiece is seriously deformed, and it is even easy to cause cracking of the weld or heat-affected zone in the case of continuous welding
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[0036] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The detailed description and accompanying drawings of the following embodiments are used to illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments, without departing from the spirit of the present invention Any modification, substitution and improvement of parts, components and connection methods are covered under.
[0037] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.
[0038] Such as Figure 1 to Figure 4 As shown, a welding method of an ultra-high-strength steel...
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Abstract
The invention relates to a welding method for a multi-cavity structure of ultra-high-strength steel based on discrete distribution of stress. The structure includes an ultra-high-strength steel cavity and a cover plate. Sealing welding, welding and slow cooling are performed in steps of welding, and the welding of a single closed weld is completed by arc starting, arc closing, and lap welding, and the multi-cavity is completed by using the layout method of staggered overlapping positions and symmetrical staggered welding sequence The overall electron beam welding of the structural workpiece under a vacuum reduces the influence between the welds, effectively controls the deformation and greatly improves the welding efficiency; at the same time, it adopts preheating before welding, slow cooling after welding and timely heat treatment. Effectively avoid the problem of weld cracking.
Description
technical field [0001] The invention relates to the technical field of electron beam processing, in particular to a welding method for a multi-cavity structure of ultra-high-strength steel based on discrete distribution of stress. Background technique [0002] Ultra-high-strength steel is mostly used for load-bearing parts due to its high strength. With the development of aviation, aerospace, ships and other fields, due to the continuous improvement of structural and functional requirements of load-bearing components, welding requirements are constantly being raised. For ultra-high-strength steel materials, welding is difficult, and the sensitivity coefficient to notch is high, and it is easy to crack after welding. At present, for ultra-high-strength steel workpieces with simple structures, electron beam welding can be used to achieve effective connection, and the tensile, impact, fatigue and other properties of the welded joints can meet the requirements. [0003] Compar...
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IPC IPC(8): B23K15/06
CPCB23K15/06
Inventor 赵桐唐振云毛智勇张桉刘昕付鹏飞
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST