Welding method of titanium alloy multilayer board and titanium alloy multilayer board
A welding method and technology of titanium alloy, applied in welding equipment, metal layered products, chemical instruments and methods, etc., can solve the problem of not meeting the quality requirements of navigation mark II welding seam, the brittleness of laser welding joints, and the inhomogeneous grain size, etc. The problem is to avoid the brittle laser welded joints of brazed multilayer boards, the grain size is small, and the structure phase transformation is avoided.
Active Publication Date: 2020-04-17
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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After many tests and analyzes, it was found that the matrix material of the multilayer plate structure, that is, the rolled plate is a two-state structure and equiaxed grain; while the brazing interface is a cast state and a dendrite structure, and its structure is relatively coarse and the grain size is not enough. Uniformity, especially the enrichment of solder elements, the above factors lead to high brittleness and low elongation of the laser welded joints in the brazed multi-layer plate area, which cannot meet the quality requirements of the navigation mark II weld seam specified in the manufacturing technical requirements
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[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0025] As shown in the figure, the welding method of the titanium alloy multilayer plate of the present invention comprises the following steps,
[0026] 1) Stack the titanium alloy plates to be welded in turn, and set brazing material on the surface to be welded between the plates, and at the same time, set metal foil between the titanium alloy plates on the side of the titanium alloy multilayer plate to be laser spliced to replace the brazing material;
[0027] 2) Apply pressure to the stacked plates and heat them in a vacuum environment and keep them warm for a predetermined time to complete brazing and diffusion welding simultaneously. The heating temperature must not exceed th...
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Abstract
The invention discloses a welding method of a titanium alloy multilayer plate. The welding method comprises the following steps: 1) to-be-welded titanium alloy plates are stacked in sequence, brazingsolders are arranged on the surface to-be-welded plates, and meanwhile metal foils are arranged between the alloy plates for laser splicing on the titanium alloy multiplayer plate to replace the brazing solders; and 2) pressure is applied to the stacked plates, the plates are heated in a vacuum environment and are subjected to heat preservation for a preset time, the brazing and the diffusion welding are synchronously completed, and the heating temperature does not exceed the phase change point of part materials. The metal foils for diffusion welding are free of melting, and other elements arecompletely not introduced or only a small number of other elements are introduced when element diffusion occurs between the metal foils and a substrate, so that the crystal grain growth and the tissue phase change of the substrate can be effectively avoided, and no corrosion to the substrate is avoided.
Description
technical field [0001] The invention relates to the field of welding technology, in particular to a welding method for a titanium alloy multilayer plate. Background technique [0002] Titanium alloy honeycomb panel structure has excellent properties such as light weight, high specific strength and specific stiffness, noise reduction, heat insulation, impact resistance, vibration reduction, and moisture resistance, and is widely used in the aerospace field. For the large titanium alloy honeycomb panel structure, it is necessary to use laser splicing method in the brazing multilayer panel area to connect it into an integral part. After many tests and analyzes, it was found that the matrix material of the multilayer plate structure, that is, the rolled plate is a two-state structure and equiaxed grain; while the brazing interface is a cast state and a dendrite structure, and its structure is relatively coarse and the grain size is not enough. Uniformity, especially the enrichm...
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IPC IPC(8): B23K28/02B32B15/01B32B7/04
CPCB23K28/02B32B7/04B32B15/01
Inventor 岳喜山静永娟高兴强潘鹏
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST