Annular curved surface titanium alloy workpiece and welding method thereof

Abstract

The invention relates to an annular curved surface titanium alloy workpiece and a welding method thereof. The welding method comprises the following steps that 1, an angle alpha of an inclined weldingseam which is not perpendicular to a forming tension direction on a formed workpiece is calculated according to the tension direction of the workpiece during forming; 2, the size of a flat plate blanking workblank is determined according to the size of the formed workpiece and the angle alpha of the inclined weld joint, and the blanking workblank is prepared through blanking; 3, the blanking workblank is welded to form a welded barrel, and no welding wire is added in the welding process; and 4, postweld heat treatment is carried out on the inclined weld joint to finish welding. The forming tension direction is decomposed in one direction parallel to the weld joint and one direction perpendicular to the weld joint when the weld joint is designed into the inclined weld joint, the load of the weld joint in the vertical direction is reduced, the integrity of the surface of the weld joint is kept, the surface roughness is small, the crack sensitivity is low, and the problem of cold formingcracking of the weld joint of an annular curved surface titanium alloy metal plate weldment with large deep drawing amount is solved.

Description

technical field [0001] The invention belongs to the technical field of sheet metal welding, in particular to a titanium alloy workpiece with an annular curved surface and a welding method thereof. Background technique [0002] Titanium and titanium alloys have excellent properties such as light weight, high specific strength, high temperature resistance, corrosion resistance, etc., and they have a wide working temperature range and good welding performance, so they have been widely used in the aviation industry. Due to the practicability and economy of titanium alloy sheet weldments, they are often used in non-important bearing parts. For straight and cone sheet weldments with simple structure, the weld does not bear the forming load, or the forming load is very small, which is not enough to crack the weld, but for the curved surface welding with complex structure and large amount of deep drawing For parts, due to the large amount of deep drawing during cold forming, when t...

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Problems solved by technology

Generally, the roughness of the weld seam is difficult to reach a high level after grinding, and the roughness is often not as good as that of the substrate. For titanium alloy parts, it is highly sensitive to the surface roughness, and when the surface roughness is large, it is easy to induce cracks during molding. , and then crack

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