SU1611648A1 - Method of diffusion welding - Google Patents

Abstract

The invention relates to pressure welding with heating, in particular to diffusion welding in vacuum or in a protective atmosphere, and can be used in mechanical engineering and the electronics industry. The aim of the invention is to improve the quality of the product to be welded by maintaining the original physical properties of the materials being welded. The method is carried out as follows. In the conical hole of one part, another part is installed at an incomplete depth with an outer conical surface and heated on the side of the female part at a speed of 30-150 ° C / s to a temperature 50 ° C below the welding temperature. At this temperature, the combination of welded parts. Isothermal aging is then carried out at the welding temperature. Due to the low heating temperature, the original physical properties of the materials being welded are retained. 1 il.

Description

The invention relates to pressure welding with heating, in particular to diffusion welding in vacuum or in a protective atmosphere, and can be used in the engineering and electronic industries.

The aim of the invention is to improve the quality of the product to be welded by maintaining the original physical properties of the materials being welded.

The drawing shows a scheme for implementing the method.

On the base 1 of the chamber 2 of the installation for diffusion welding, the female part 3 is installed, in the conical opening of which the female part 4 with the external conical surface is installed at an incomplete depth. The corners of the cones of the joined surfaces of the parts are the same. A technological pressure of 0.1-0.3 kg / mm is applied, a vacuum or protective atmosphere is created in the chamber, high-frequency heating is performed with inductor 5 or by another heating method with a speed of 30-150 degrees / s to a temperature 50 ° C below the temperature welding and isothermal aging. Due to the difference in thermal expansion coefficients at welding temperature, the necessary contact pressure is created at which welding takes place.

The combination of surfaces occurs due to the heating of the female part at a speed of 30-150 degrees / s, which allows, when the temperature reaches 50 ° C below the welding temperature, to create a temperature difference between the female and covered parts 300-500 ° C and to retain the original physical properties of the welded parts. materials, which allows to improve the quality of the welded product.

The use of heating rate below 30 degrees / s does not always allow to combine the parts to be welded, since the difference is

about

four

00

The rjeparyp between the covered and covered parts does not exceed 150 ° C.

When the heating speed of the female Parts is more than 150 degrees / s, the temperature difference between the parts being welded does not increase, but, on the other hand, it requires the use of expensive equipment to create heating at such a speed.

Example. In the manufacture of hydrostatic surfaces, the surfaces were treated with a roughness of U, 6.3 μm, the angle of the cones was 1.9 °. The prepared surfaces of the female and male parts were degreased and installed in the installation chamber. A technological pressure of 0.3 kg / mm was applied and the chamber was evacuated. Heated up to 710 ° C at a rate of 40 degrees / s, at this time there is a combination of the welded surfaces. Assembly

the chesc bearing was stainless-10 welded; 760 ° C throughout

and; 12H18N10T steel with composite 13 min. Cooling was carried out in vacuum to

| Material (20X13H + CaP3 + MoSa) .150 ° C. The maximum diameter of the male part is 100 mm, the average combination diameter is 64 mm, height is 86 mm.

Claims (1)

Invention Formula 15 The surfaces being welded were treated with a roughness of U, 6.3 μm, the angle of the cones was 1.9 °. The prepared surfaces of the female and male parts were degreased and installed in the installation chamber. A technological pressure of 0.3 kg / mm was applied and the chamber was evacuated. Heated up to 710 ° C at a rate of 40 degrees / s, at this time there is a combination of the welded surfaces. Assembly  kept at; 760 ° C throughout Invention Formula 15 The method of diffusion welding of parts from heterogeneous materials, in which another part is installed at an incomplete depth with another conical surface into a conical hole of one part, is preheated 20 parts to combine the surfaces to be welded due to the difference in thermal expansion coefficients of the materials being welded and isothermally held at A 306.04 with induction heat-welding temperature, characterized in that E | OM in a vacuum of 0 mm Hg. Art. The process aims to increase the quality of the welded products by preserving the original physical properties of the materials to be welded, preheating is carried out from the side of the female part and with: The bearing was manufactured as follows with a thickness of 30-150 degrees / s to a temperature of Obzom.50 ° C below the welding temperature. The heating rate of the covering detail was chosen based on the experimentally approved formula. (± 15 degrees / s), r | de di-diameter of the female part; I dz is the diameter of the male part. Diffusion welding was carried out on s | boiling was carried out with the following parameters: U, 760 ° C,, degrees / s, g (|, 3 kg / mm, min.) The product was cooled by EJ vacuum.