RU2400338C1 - Procedure for welding anode with contact and metal-ceramic insulator of chamber on plasma focus - Google Patents

Abstract

FIELD: machine building. ^ SUBSTANCE: invention refers to procedure for welding anode with contact and metal-ceramic insulator of chamber on plasma focus and can be implemented at fabrication of chamber on plasma focus. A solid copper anode is installed in a hollow metal-ceramic insulator with a collar; there is created a gap between the anode and an upper end of the insulator. A copper contact with a gap between the contact and the insulator collar is forced on another end of the anode. Value of the gap between the contact and the collar of the insulator is adjusted by means of installation of copper pads into the gap between the anode and the upper end of the insulator. An assembled structure is placed into the chamber; further, the anode, contact and metal-ceramic insulator are simultaneously electron-beam welded. ^ EFFECT: high quality of welding and increased percent of accepted production output. ^ 2 cl, 1 dwg, 1 tbl

Description

The invention relates to welded joints and is intended for welding complex structures, in particular in the manufacture of a chamber on a plasma focus.

A known method of soldering telescopic products (see, for example, RF patent No. 2109605, class B23K 1/00, 1996), based on the preliminary assembly of parts of the telescopic product with subsequent soldering.

This method offers a preliminary control of the adhesion density of the soldered surfaces, followed by coating, which complicates the soldering process.

A known method of welding telescopic products (see, for example, RF patent No. 2096143, class B23K 1/00, 1996), based on the preliminary assembly of parts with the installation of a gap between the outer and inner shells, followed by welding in a furnace in an inert gas atmosphere.

When implementing this method, to increase the yield of products, it is necessary to use an additional compensator with its subsequent removal, which complicates the process of welding parts.

The proposed technical solution is aimed at simplifying the implementation of the method while maintaining the quality of welding and yield.

To do this, in the method of welding the anode with the contact and the ceramic-metal insulator of the chamber on the plasma focus, a monolithic copper anode is installed in the ceramic-metal insulator made with a cuff to form a groove between the anode and the upper end of the insulator, a copper contact is inserted on the other end of the anode with a gap between the contact and the insulator cuff, adjust the gap between the contact and the insulator cuff by installing copper gaskets in the groove between the anode and the upper end of the insulator, the assembled structure is placed electron beam welding of the anode, the contact and the ceramic-metal insulator at the same time is carried out, the gap between the copper contact and the cuff of the insulator is set 0.2-0.3 mm.

The invention is illustrated by the drawing, which shows the design of the welded product.

In the drawing are indicated: anode 1, insulator 2 with a cuff 3, pin 4, copper gaskets 5, ELS - welding place.

The invention consists in the following.

All parts to be welded must be made of the same material. In the proposed method, all parts are made of copper. The insulator is made of cermet.

The anode is made integral to ensure the passage of current without local heating at the welds.

Before welding, the welded structure is assembled in the following sequence. First, the monolithic anode 1 is installed in the insulator 2 with the cuff 3. From the free end, the copper contact 4 is installed on the anode so that between the anode 1, the contact 4 and the cuff 3 of the insulator 2, a gap of 0.2-0 width remains at the welding site, 3 mm. The gap provides high-quality welding with a variable length of the insulator (within the tolerance). The gap is regulated by the selection of copper gaskets 5 with a thickness of 0.05 mm, placed in the upper groove between the anode 1 and the upper end of the insulator 2. If necessary, the operation of adjusting the gap is repeated. The assembled structure is placed in a special chamber and electron beam welding is performed. The welding mode is selected in such a way that the anode 1 and contact 4 are simultaneously welded by the metal remelting method (both materials are copper), while the penetration depth of the contact and the anode must be at least 0.3 mm in diameter to ensure the conductivity of the welded structure, and the contact is welded 4 with a ceramic-metal insulator by the method of deposition of copper of contact on the insulated cuff of the insulator.

Electron beam welding of the anode with a contact and a ceramic-metal insulator in the manufacture of a chamber on a plasma focus was carried out according to instruction OT.25395.00000 in the mode shown in the table.

Table Uus K., I St. V T St. I nar., I decline., kV ta rpm from tA / s mA / s 40 40 3 19.3 8 2

The tightness of the weld was controlled by a helium mass spectrometric leak detector. The tightness rate is not more than 5 · 10 ^-11 m ³ · Pa / s (W).

The proposed welding method has the following advantages:

- provides the installation of a monolithic anode in the product from the inside;

- provides welding of cylindrical parts with a diameter of more than 18 mm;

- provides manufacturability of assembly and welding operations;

- excludes selective machining of the insulator-anode compound;

- significantly reduces process waste.

Claims (2)

1. A method of welding an anode with a contact and a metal-ceramic insulator of the chamber at a plasma focus, characterized in that a monolithic copper anode is installed in the metal-ceramic insulator, made hollow and with a cuff, with a groove between the anode and the upper end of the insulator, a copper contact is inserted on the other end of the anode with the gap between the contact and the cuff of the insulator, adjust the gap between the contact and the cuff of the insulator by installing copper gaskets in the groove between the anode and the upper end of the insulator, assembled ruktsiyu placed in the chamber and produce electron beam welding simultaneously anode contact and the insulator cermet. 2. The method according to claim 1, characterized in that the gap between the copper contact and the cuff of the insulator is set 0.2-0.3 mm

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