SU1507553A1 - Method of diffusion welding - Google Patents

Abstract

The invention relates to diffusion welding and can be used for the manufacture of hollow annular parts in various fields of engineering. The purpose of the invention is to improve the precision of the compound and simplify the process by eliminating preparatory operations. The welded surfaces of the hollow ring parts are pre-cut at an angle corresponding to the friction angle for the materials to be welded. Parts are installed in the welding chamber, a vacuum is created in it and longitudinal ultrasonic vibrations are applied to them. The parts are then heated to the welding temperature, compressed, and isothermally conditioned. The ultrasonic treatment process prevents relative displacement of the parts to be welded.

Description

The invention relates to diffusion welding and can be used for the manufacture of hollow annular parts in various fields of C 1 .- (- eni.

The aim of the invention is to improve the precision of the joint and simplify the process by eliminating preparatory operations for welding hollow ring parts.

The method is carried out as follows.

The welded surfaces of the hollow annular parts are milled at an angle corresponding to the angle of baking for the materials to be welded. Parts are installed in the welding chamber, a vacuum is created in it and longitudinal ultrasonic vibrations are applied to them. The parts are heated to the welding temperature, compressed, and an isothermal charge is carried out.

Due to the angle of inclination of the surfaces to be welded, which corresponds to the angle of friction, the relative displacement of the parts to be welded is prevented, as a result of which a precise connection is achieved without the use of special fixation parts to be welded.

When the angle of inclination of the surfaces to be welded is less than the friction angle, the relative displacement of parts occurs during ultrasonic action and heating. When the angle of inclination of the surfaces to be welded is greater than the friction angle, the covering of the workpiece is observed from ultrasonic action and heating, a change in the geometric dimensions, the appearance of microcracks on the surfaces of the workpieces, which reduces the quality of the products obtained.

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Example. Got a hollow ring billet and-z two ring parts. Parameters details: material - steel SHH15Sh; outer diameter - 100 mm, inner diameter - 70 mm; width - 10 mm; wall thickness - 3 mm

On one of the parts, both annular weldable noBepxHocTH were made in the form of internal chamfers under. an angle of 15 ° to the plane of the connector (or to the end surface), on the other - reciprocal weldable surfaces in the form of external chamfers also at an angle of 15 to the plane of the connector. Then, the parts without finishing machining and any preparatory operations on the contact surfaces (cleaning, degreasing, pickling, washing and drying) were combined and installed in a vacuum chamber. The hub (waveguide) of longitudinal ultrasonic vibrations with a force of 0.1 kg / mm was pressed to each other by a concentrator (waveguide). The concentrator was introduced into the chamber through an appropriate seal and connected through a magnetostrictive transducer with a generator U 31 1P. The chamber was closed, evacuated to 1 -10 pm Hg. n

included ultrasonic count. : .a.1i with an amplitude close to maxima.

After some time, due to the friction and plastic strength forces, the surfaces to be welded heated and a contract phase occurred. When reaching 400 ° C, forced heating was turned on and the temperature was raised to this Mar. and steel. The squeeze force was increased to 2 kg / mm, and the amplitude of oscillations was reduced and dried, and an isothermal output for 3 minutes.

Claims (1)

Invention Formula The method of diffusion welding, with F l, where longitudinal ultrasonic co-tubes are applied to the parts to be welded. The heat waves, c / aniniB,:) are isothermal, and are isothermal, characterized in that, in order to improve performance and simplify the technology by eliminating preparatory operations during the pairing of hollow ring parts, the surfaces being welded the angle corresponding to the friction angle for mating materials.