SU1296342A1 - Method of diffusion welding - Google Patents

Abstract

The invention relates to pressure welding, in particular to diffusion welding, and can be used in the manufacture of T-structures in various areas of diffusion. The aim of the invention is to improve the quality of the welded joint in the manufacture of T-structures. The pre-deformed part of the wall of the brand is made with a width less than eei thickness. A projection is made on the shelf of the brand depending on the height of the deformable part. The wall of the brand is installed on the protrusion, the node is heated and squeezed, providing a quality connection k 1 sludge.

Description

The invention relates to pressure welding, in particular to diffusion welding, and can be used in the manufacture of T-shaped structures in various industries.

The purpose of the invention is to improve the quality of the welded joint.

The drawing shows a scheme for implementing the method.

A preform of a T-shaped structure is made, consisting of wall 1 and shelf 2. Pre-deformable part 3 of wall 1 with height h is 0.8-0.95 width of its thickness, and projection 4 with height (h,) is carried out on shelf 2 0.4 - 1.0 height of the deformable part of the wall 1 and a width of 8 equal to the thickness of this part S. The wall 1 is mounted on the protrusion 4 of the shelf 2, clamped in the equipment 5, heated and squeezed. In the process of squeezing, the thinned part of the wall and the protrusion are deformed to a certain size, ensuring a good connection of the wall with the shelf. After welding, the parts are subjected to tests. The deformable part of the wall, equal to 0.80-0.95 of its thickness, allows for better deformability of the metal of the wall: due to the removal of the surface hardened layers. High deformability of this part provides high ductility. metal wall when welding pressure is applied. When the width of the deformable part of the wall is more than 0.95, its thickness cannot completely remove the surface nagged metal layers of the wall, which leads to uneven deformation along the length of the weld and causes a decrease in the toughness of the welded joint. When the width of the deformable part of the stekka is less than 0.80 of its thickness, its excessive thinning occurs and, with the application of welding pressure, local loss of its stability. This entails a distortion of the product geometry and leads to a decrease in the toughness of the welded joint.

A protrusion on a flange welded to the wall with a height of 0.40-1.0, the height of the deformable part of the wall and a width equal to its thickness, provides the most favorable conditions for the development of shear deformations in the contact zone welded over

0 5 about 5 0

five

five

0

application of welding pressure. The development of plastic deformations in the area of the contact surfaces provides a high value of the toughness of the welded joint when performing the process of diffusion welding. This also contributes to the equality of the thickness of the protrusion on the shelf and the deformable part of the wall.

When the protrusion height on the shelf is less than 0.40 the height of the deformable part of the wall, the development of shear deformations in the contact zone is insufficient, which leads to the preservation of the surface oxide films, which reduce the impact strength of the welded joints;

When the height of the protrusion on the shelf is more than 1.0 of the height of the deformable wall part, when welding pressure is applied during diffusion welding, the welded areas are affected due to the buckling of the deformable part of the wall and the shelf protrusion. This causes a distortion of the geometry of the welded product and a reduction in the toughness of the welded joints.

When the protrusion width on the shelf is less than the thickness of the deformable part of the wall, the shape of the welded joint is distorted, which leads to a decrease in toughness.

When the width of the protrusion is greater than the thickness of the deformable part of the wall, it deforms to a greater extent than the protrusion when welding pressure is applied. This reduces the development of shear deformations in the joint zone and, as a result, leads to a decrease in toughness,

Example. Make tavrovuyu construction of titanium alloy VT20. Previously on the wall tol-. 16 mm thick, the deformable part h is made with a height of 8 mm and a width

13.6 mm (0.85). The height is determined taking into account the stability of the wall. On a shelf 35 mm thick, a projection is made with a height of 5.6 mm.

(0.7 h) and a width of 13.6 mm .. Wall mounted on the ledge of the shelf. It is clamped in the tooling, the parts are heated to 980 ° C, compressed with a force of 2 kg / mm, and isothermally aged for 3 hours. Toughness tests have shown that the strength of the joint has reached the strength of the base metal.

Claims (1)

Invention Formula The method of diffusion welding of two elements in which a protrusion is made on one of the surfaces being welded, which differs in In order to improve the quality of the welded joint when manufacturing the T-structures, the deformable part of the wall of the brand is made thick, even 0.8-0.95 thick, and the protrusion is made on a shelf with a height of 0.4-1.0 the height of the deformable part of the wall and the width j equal to the thickness of this part. Editor M.Petrova Compiled by T. Olesova Tehred M. Khodanich. Proofreader M. Demchik Order 704/17 Circulation 976 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 4/5, Moscow, Zh-35, Raushsk nab. 113035 Production and printing company, Uzhgorod, st. Project, 4