CN113000963A

CN113000963A - Welding method for titanium window of CT tube

Info

Publication number: CN113000963A
Application number: CN202110331248.6A
Authority: CN
Inventors: 丁凯; 余以智; 汤炜; 舒春根
Original assignee: HANGZHOU KAILONG MEDICAL INSTRUMENTS CO Ltd
Current assignee: HANGZHOU KAILONG MEDICAL INSTRUMENTS CO Ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2021-06-22
Anticipated expiration: 2041-03-29
Also published as: CN113000963B

Abstract

The invention discloses a welding method of a titanium window of a CT tube, which is characterized by comprising the following welding steps: the first step is as follows: molding; the second step is that: pre-welding; the third step: performing primary positioning; the fourth step: fixing; the fifth step: welding; and a sixth step: and (6) cooling. This through carrying out prewelding with titanium window and solder earlier, then when welding the titanium window to CT pipe shell between titanium window and CT pipe shell increase a slice solder, make the solder connect the solder on CT pipe shell and the titanium window during the welding to avoid the solder to lead to the titanium window to weld insecurely because of the affinity reason, it is effectual to weld, and the leakproofness is strong, product quality height.

Description

Welding method for titanium window of CT tube

Technical Field

The invention relates to the field of welding of titanium windows of CT tubes, in particular to a welding method of the titanium windows of the CT tubes.

Background

The existing CT tube usually needs to be provided with a titanium window as a radiation window, the CT tube has very high requirement on the sealing property and cannot leak a little, otherwise, the CT tube fails; at present, when a titanium window is installed, the titanium window is basically fixedly connected by welding, the shell of the existing CT tube is basically made of Monel alloy, the titanium window is made of titanium, when the titanium window and the CT tube are welded by welding materials in the prior art, the welding materials have stronger affinity with the shell of the CT tube, the affinity with the titanium window is poorer, and the difference between the titanium window and the shell of the CT tube is overlarge, so that the titanium window is welded on the shell of the CT tube insecure, and ray leakage and the titanium window falls off from the outside of the CT tube due to insufficient strength are caused by the insecure welding;

although the welding is not firm, the secondary repair welding can be adopted for adjustment, the success rate of the secondary repair welding is low, the risk of damage to a product is high even after the welding is finished, and the production process and the production cost are increased.

Disclosure of Invention

The invention aims to provide a method for welding a titanium window of a CT tube, which aims to solve the problem of infirm welding of the titanium window.

In order to achieve the above purpose, the invention provides the following technical scheme; a welding method of a titanium window of a CT tube is characterized by comprising the following welding steps:

the first step is as follows: molding; performing a solder and a titanium window through a die, then placing the solder and the titanium window into a heating furnace for high-temperature shaping, and naturally cooling along with the heating furnace after the high-temperature shaping;

the second step is that: pre-welding; prewelding the solder and the titanium window in a vacuum environment;

the third step: performing primary positioning; installing the prewelded titanium window on the CT tube shell, and adding a welding flux between the titanium window and the CT tube shell;

the fourth step: fixing; installing a compaction assembly on the CT tube shell, and fixing the prewelded titanium window and the welding flux on the CT tube shell through the compaction assembly;

the fifth step: welding; performing brazing welding in a vacuum environment, welding the added welding flux between the titanium window and the CT tube shell and the CT tube together, and simultaneously welding the welding flux and the welding flux on the titanium window subjected to pre-welding, thereby fixedly welding the titanium window to the CT tube shell;

and a sixth step: and (5) after cooling, removing the pressing assembly, and completing welding.

Preferably, the vacuum degree of the vacuum cavity is-1 to-4 Pa when the solder in the second step and the fifth step is welded.

Preferably, the solder is one or more of silver, copper and nickel.

The compressing assembly comprises a fixing plate, a plurality of fixing screws arranged on the fixing plate, a compression post movably arranged on the fixing plate and a pressing plate movably arranged on the fixing plate, and a guide post slidably connected with the fixing plate is also arranged on the pressing plate.

The invention performs prewelding on the titanium window and the welding flux, then adds a piece of welding flux between the titanium window and the CT tube shell when welding the titanium window on the CT tube shell, and enables the welding flux to be connected with the welding flux on the CT tube shell and the titanium window during welding, thereby avoiding the titanium window from being welded firmly due to affinity, having good welding effect, strong sealing performance and high product quality.

Drawings

FIG. 1 is a schematic view of a welding process of the present invention;

FIG. 2 is a schematic structural diagram of the present invention during welding;

FIG. 3 is a schematic view of a partially broken and enlarged structure of the present invention during welding;

fig. 4 is a schematic structural view of a pressing assembly of the present invention.

Illustration of the drawings: 1. welding flux; 2. a titanium window; 3. a CT tube housing; 4. a compression assembly; 41. a fixing plate; 42. a set screw; 43. pressing the column; 44. pressing a plate; 45. and a guide post.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Example 1:

referring to fig. 1-3, the method for welding a titanium window of a CT tube according to the present embodiment is characterized by the following steps:

the first step is as follows: molding; performing a solder 1 and a titanium window 2 through a die, then placing the solder 1 and the titanium window 2 into a heating furnace for high-temperature shaping, and naturally cooling along with the heating furnace after the high-temperature shaping;

the second step is that: pre-welding; prewelding the solder 1 and the titanium window 2 in a vacuum cavity;

the third step: performing primary positioning; installing the prewelded titanium window 2 on a CT tube shell 3, and adding a welding flux 1 between the titanium window 2 and the CT tube shell 3;

the fourth step: fixing; a compaction component 4 is arranged on the CT tube shell 3, and the prewelded titanium window 2 and the welding flux 1 are fixed on the CT tube shell 3 through the compaction component 4;

the fifth step: welding; performing brazing welding in a vacuum chamber, so that welding flux added between the titanium window 2 and the CT tube shell 3 is welded with the CT tube, and simultaneously welding the welding flux on the titanium window subjected to pre-welding, thereby fixedly welding the titanium window 2 to the CT tube shell 3;

and a sixth step: and (5) after cooling, removing the compression assembly 4 to finish welding.

Further, when the welding materials in the first step and the fifth step are welded, the vacuum degree of the vacuum cavity is-1 to-4 Pa.

Further, the solder 1 is one or more of silver, copper and nickel.

Further, referring to fig. 2-4, the pressing assembly 4 includes a fixing plate 41, a plurality of fixing screws 42 mounted on the fixing plate 41, a pressing post 43 movably mounted on the fixing plate 41, and a pressing plate 44 movably mounted on the fixing plate 41, wherein a guiding post 45 slidably connected with the fixing plate 41 is further mounted on the pressing plate 44; the position of the fixing plate on the CT tube shell is limited through the arrangement of a plurality of fixing screws, so that the position of the pressing plate corresponds to the position of the titanium window on the CT tube shell, the titanium window can be accurately fixed, and the titanium window is convenient to weld and fix; through the setting of guide post, play the guide effect to the clamp plate.

Example 2:

example 2 differs from example 1 only in that the degree of vacuum of the vacuum chamber at the time of welding was-2 Pa;

example 3:

example 3 differs from examples 1 and 2 only in that the degree of vacuum of the vacuum chamber at the time of welding was-4 Pa;

the scope of protection of the invention is not limited to the above embodiments and variations thereof. The present invention is not limited to the above embodiments, but may be modified in various ways.

Claims

1. A welding method of a titanium window of a CT tube is characterized by comprising the following welding steps:

the first step is as follows: molding; performing a solder (1) and a titanium window (2) through a die, then placing the solder (1) and the titanium window (2) into a heating furnace for high-temperature shaping, and naturally cooling along with the heating furnace after the high-temperature shaping;

the second step is that: pre-welding; carrying out vacuum pre-welding on the solder (1) and the titanium window (2) in a vacuum environment;

the third step: performing primary positioning; mounting the prewelded titanium window (2) on a CT tube shell (3), and adding a welding flux (1) between the titanium window (2) and the CT tube shell (3);

the fourth step: fixing; a pressing component (4) is arranged on the CT tube shell (3), and the prewelded titanium window (2) and the welding flux (1) are fixed on the CT tube shell (3) through the pressing component (4);

the fifth step: welding; carrying out brazing welding in a vacuum environment, so that the added welding flux between the titanium window (2) and the CT tube shell (3) is welded with the CT tube, and simultaneously, the welding flux is welded with the welding flux on the titanium window which is subjected to pre-welding, thereby fixedly welding the titanium window (2) to the CT tube shell (3);

and a sixth step: and (5) after cooling, removing the pressing assembly (4) to finish welding.

2. The welding method of the titanium window of the CT tube according to claim 1, characterized in that: and the vacuum degree of the solder in the second step and the fifth step is-1 to-4 Pa during vacuum welding.

3. The welding method of the titanium window of the CT tube according to claim 2, characterized in that: the solder (1) is one or a combination of more of silver, copper and nickel.

4. The welding method of the titanium window of the CT tube according to claim 1, characterized in that: compress tightly subassembly (4) and contain fixed plate (41), install a plurality of set screw (42) on fixed plate (41), movable mounting pressure post (43) and movable mounting clamp plate (44) on fixed plate (41), still install guide post (45) with fixed plate (41) sliding connection on clamp plate (44).