CN219457523U - Tube shell welding structure and traveling wave tube composite tube shell - Google Patents

Abstract

The utility model provides a tube shell welding structure, which comprises a pole shoe, a connecting ring and two welding pieces, wherein the pole shoe and the connecting ring are coaxially arranged, the two welding pieces are respectively arranged on the side surfaces of two sides of the connecting ring, and the pole shoe, the connecting ring and the two welding pieces are connected into a whole through welding; the connecting ring comprises a second circular ring, a second central hole and two second annular bosses; the soldering lug comprises a circular gasket and a third central hole; the third center holes of the two welding lugs are respectively sleeved at the two second annular bosses of the connecting ring. According to the tube shell welding structure, the welding lug is designed into the gasket type structure and is arranged between the pole shoe and the connecting ring, and mass production and processing of the welding lug can be facilitated during production, so that the use amount of welding materials can be accurately controlled, the flow track of the welding lug can be controlled during welding, the welding seam between the connecting ring and the pole shoe is uniform, the thickness is consistent, and the welding quality and the integral strength of the tube shell welding structure are improved. The utility model also provides a traveling wave tube composite tube shell.

Description

Tube shell welding structure and traveling wave tube composite tube shell

Technical Field

The utility model relates to the technical field of traveling wave tubes, in particular to a tube shell welding structure and a traveling wave tube composite tube shell.

Background

The travelling wave tube is a microwave electron tube which realizes the amplifying function by continuously modulating the speed of electron beam. In traveling wave tubes, electrons are passed through a long slow wave circuit structure and kinetic energy is imparted to a microwave signal field continuously in the slow wave circuit, thereby amplifying the signal. The traveling wave tube is applied to the fields of radar, electronic countermeasure, communication and the like and used as a core device for microwave power amplification.

At present, most of common traveling wave tubes in the market adopt a composite tube shell high-frequency structure, and especially, the heat dissipation capacity of the traveling wave tube can be improved by adopting a composite tube shell technology in a high-power traveling wave tube. Compared with the common thin-wall tube shell structure, the composite tube shell structure has the advantages of small contact thermal resistance, strong magnetic focusing capability, good heat dissipation, large power capacity and the like. Especially, when the traveling wave tube is in a high-low temperature environment test, the traveling wave tube adopting the composite tube shell structure has more excellent heat radiation capability and magnetic focusing capability than the traveling wave tube adopting the common thin-wall tube shell structure.

The composite tube shell adopted in the existing millimeter wave high-power traveling wave tube is welded into a whole by a plurality of tube shell welding structures, and pole shoes and connecting rings in the tube shell welding structures are mutually stacked and fixed through welding. In the existing structure, welding seams are formed by the mutual abutting surfaces of the pole shoes and the connecting rings, then welding materials (gold nickel wires or gold copper wires) are wound around the outer side ends of the welding seams manually, and the welding materials are fused into the welding seams by utilizing capillary fluidity through brazing. In the actual welding process, the existing tube shell welding structure has the defects that the depth and uniformity of welding flux entering a welding line are uncontrollable due to the errors of the processing precision of a pole shoe and a connecting ring, so that the welding flux flows unevenly and has gaps after the composite tube shell is welded, obvious cracks can appear after the composite tube shell is stressed and bent, even some welding lines do not have the problem of welding flux, and therefore the integral welding defects of the composite tube shell are more, the strength is low, the performance of the subsequent traveling wave tube composite tube shell is influenced, and the production requirements of the traveling wave tube composite tube shell on mass and consistency cannot be ensured.

Disclosure of Invention

The utility model aims to solve the defects that in the tube shell welding structure of the existing traveling wave tube, the depth and uniformity of a welding line entering the welding line are uncontrollable in the brazing process, so that the welding line flows unevenly in a composite tube shell, particularly obvious cracks appear after the composite tube shell is stressed, and the welding line is free of welding line.

The technical scheme adopted for solving the technical problems is as follows: the shell welding structure comprises a pole shoe and a connecting ring which are coaxially arranged, and two welding pieces which are respectively arranged on the side surfaces of two sides of the connecting ring, wherein the pole shoe, the connecting ring and the two welding pieces are connected into a whole through welding;

the connecting ring comprises a second circular ring, a second central hole arranged at the center of the second circular ring and two second annular bosses which are respectively arranged at two sides of the second circular ring and are arranged around the second central hole;

the welding lug comprises a circular gasket and a third central hole arranged at the center of the circular gasket;

and the third center holes of the two welding lugs are respectively sleeved at the two second annular bosses of the connecting ring.

In one embodiment, the circular pad of the lug has an outer diameter equal to the outer diameter of the second circular ring of the connecting ring.

In one embodiment, the third central hole of the lug has an aperture equal to the outer diameter of the second annular boss of the connecting ring.

In one embodiment, the thickness of the circular pad of the lug is equal to the height of the second annular boss of the connecting ring.

In one embodiment, the connecting ring is made of a non-magnetic material, and the soldering lug is made of oxygen-free copper, gold copper or gold nickel.

In one embodiment, the pole shoe comprises a first circular ring, a first central hole arranged at the center of the first circular ring, and two first annular bosses which are respectively arranged at two sides of the first circular ring and are arranged around the first central hole.

In one embodiment, the second annular ring of the connecting ring has an outer diameter greater than an outer diameter of the first annular boss of the pole piece.

In one embodiment, the first central bore of the pole piece is coaxially disposed with the second central bore of the connecting ring.

The tube shell welding structure provided by the utility model has the beneficial effects that: the welding pieces are designed into a gasket type structure and are arranged on the side surfaces of the two sides of the connecting ring, the welding pieces are directly arranged between the pole shoe and the connecting ring, and during production, batch production and processing of the welding pieces can be facilitated, so that the use amount of welding materials can be accurately controlled, and during welding, the flow track of the welding pieces can be controlled, so that the welding seam between the connecting ring and the pole shoe is uniform, the thickness is consistent, the welding quality of a tube shell welding structure is improved, and the integral strength of the tube shell welding structure after welding is ensured; the second annular boss is arranged on the side face of the connecting ring and used for placing the welding lug, so that a welding seam between the connecting ring and the pole shoe is a space enclosed between the second annular boss and the pole shoe, the problem of uneven solder fluidity of the pole shoe and the connecting ring caused by processing errors can be solved, the effect of shaping the whole thickness of the pole shoe, the connecting ring and the welding lug is achieved, the thickness of the pole shoe and the connecting ring after welding is controlled, the whole thickness of a welded shell and tube welding structure after welding is accurately controlled, and the yield after welding is high.

The utility model also provides a traveling wave tube composite tube shell, which is formed by welding a plurality of tube shell welding structures.

In one embodiment, a mounting hole is formed in the center of the traveling wave tube composite tube shell, and the aperture of the mounting hole is larger than the outer diameter of the second annular boss.

The traveling wave tube composite tube shell provided by the utility model has the beneficial effects that: by adopting the tube shell welding structure, the welding lug is designed into a gasket type structure, so that the flow track of the welding lug during welding can be controlled, the welding seam between the pole shoe and the connecting ring is uniform, the thickness is consistent, the whole length of the welded traveling wave tube composite tube shell can be effectively controlled, and a good foundation is laid for the subsequent processing of the traveling wave tube; the welding quality and the overall strength of the welded traveling wave tube composite tube shell can be improved, so that the welded traveling wave tube composite tube shell can meet the production and processing requirements of traveling wave tube batch and consistency.

Drawings

Fig. 1 is a schematic view of a three-dimensional exploded structure of a tube shell welding structure according to the present utility model;

fig. 2 is a side view of a cartridge soldering arrangement in accordance with the present utility model;

FIG. 3 is a cross-sectional view of a cartridge soldering configuration provided by the present utility model;

FIG. 4 is a cross-sectional view of a pole shoe in a cartridge weld configuration provided by the present utility model;

fig. 5 is a cross-sectional view of a connecting ring in a tube shell welding structure provided by the utility model;

fig. 6 is a cross-sectional view of a lug in a welded structure of a package provided by the utility model;

fig. 7 is a schematic perspective view of a traveling wave tube composite tube shell provided by the utility model.

Reference numerals illustrate:

100-tube shell welding structure, 200-traveling wave tube composite tube shell;

the device comprises a pole shoe 10-a first circular ring 11-a first central hole 12-a first annular boss 13-a first annular boss;

20-connecting rings, 21-second circular rings, 22-second central holes and 23-second annular bosses;

30-welding tabs, 31-circular gaskets and 32-third center holes;

40-mounting holes; the aperture of the L1-mounting hole and the aperture of the L2-third central hole;

h1-the height of the second annular boss and H2-the thickness of the soldering lug;

d1-the outer diameter of the second circular ring and D2-the outer diameter of the second annular boss;

d3-outer diameter of the circular gasket, D4-outer diameter of the first annular boss.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Referring to fig. 1-6, a tube and shell welding structure 100 is provided in accordance with the present utility model. The tube shell welding structure 100 is applied to the technical field of traveling wave tubes. Fig. 1 is a perspective exploded view of a tube welding structure 100 according to the present utility model. The shell welding structure 100 comprises a pole shoe 10 and a connecting ring 20 which are coaxially arranged, and two welding pieces 30 which are respectively arranged on two side surfaces of the connecting ring 20, wherein the pole shoe 10, the connecting ring 20 and the two welding pieces 30 are connected into a whole through welding. Wherein the pole piece 10 is located on one side of the connecting ring 20 and a weld tab 30 is provided at the interface of the pole piece 10 and the connecting ring 20. When two shell-and-tube welded structures 100 are joined together, one side face of the connecting ring 20 in one shell-and-tube welded structure 100 is welded to the pole piece 10 in the structure by the lug 30 located on the side face, and the other side face is welded to the side of the pole piece 10 in the adjacent shell-and-tube welded structure 100 where the connecting ring 20 is not located by the lug 30 located on the side face. In this way, a plurality of tube shell welding structures 100 provided by the utility model can be welded to form the traveling wave tube composite tube shell 200 provided by the utility model as shown in fig. 7. The traveling wave tube composite tube shell 200 is applied to a traveling wave tube and provides a shell structure for a slow wave circuit in the traveling wave tube.

As shown in fig. 1 to 3, the shell welding structure 100 provided by the present utility model includes a pole shoe 10, a connecting ring 20, and two welding tabs 30, wherein one welding tab 30 fixes the pole shoe 10 and the connecting ring 20 in the structure, and the other welding tab 30 fixes the connecting ring 20 and the pole shoe 10 in the adjacent shell welding structure 100. In the same shell weld 100, the connecting ring 20 and the two lugs 30 are located on the same side of the pole piece 10. While the gap between the connecting ring 20 and the pole piece 10 forms a weld for receiving the tab 30 so that the tab 30 may be incorporated therein during welding, securing the two together.

As shown in fig. 4, a cross-sectional view of the pole piece 10 in the can welding configuration 100 provided by the present utility model is shown. The pole shoe 10 provided by the utility model comprises a first circular ring 11, a first central hole 12 arranged at the center of the first circular ring 11, and two first annular bosses 13 respectively arranged at two sides of the first circular ring 11 and surrounding the first central hole 12. The pole shoe 10 is processed by high magnetic conductive materials, and the outline dimension of the pole shoe 10 is adaptively adjusted according to different design requirements of different traveling wave tubes. And the first central hole 12 arranged at the center of the first circular ring 11 is coaxially arranged with the connecting ring 20, and in the traveling wave tube, the electric motor can pass through. The outer circumferential surface of the first ring 11 forms a heat radiating fin to increase a heat radiating area for the entire composite shell 200, thereby improving a heat radiating effect of the entire composite shell 200. And the first annular bosses 13 provided at both side surfaces of the pole shoe 10 are used for welding with the connection ring 20. The outer side of the first annular boss 13 is intended to contact the lug 30 and to effect a fixed connection with the connecting ring 20.

As shown in fig. 5, a cross-sectional view of the connection ring 20 in the case soldering structure 100 according to the present utility model is shown. The connecting ring 20 provided by the utility model comprises a second ring 21, a second central hole 22 arranged at the center of the second ring 21, and two second annular bosses 23 respectively arranged at two sides of the second ring 21 and surrounding the second central hole 22. In this embodiment, the connecting ring 20 is made of a non-magnetic material, i.e. the connecting ring 20 is made of a non-magnetic material. In this embodiment, the first central hole 12 of the pole shoe 10 is coaxially disposed with the second central hole 22 of the connecting ring 20, so that the first central hole 12 of the pole shoe 10 can be sleeved on the core rod before welding, and the second central hole 22 of the connecting ring 20 can be sleeved on the core rod, so that the pole shoe 10 and the connecting ring 20 are coaxially disposed and are ready for subsequent welding. The second annular boss 23 disposed on the connecting ring 20 is used for fixing the welding lug 30, and the second annular boss 23 is used for limiting the whole thickness of the welded pipe shell welding structure 100, so that the thickness of the welded pipe shell welding structure 100 is effectively controlled, the welding joint in the pipe shell welding structure 100 provided by the utility model can be formed by using the clearance enclosed between the protruding part of the second annular boss 23 and the first annular boss 13 of the pole shoe 10 to accommodate the welding lug 30, and all the welding flux is filled in the clearance, so that the welding lug 30 can be fully melted in the clearance, and the purpose of controlling the flow track of the welding lug 30 is achieved.

As shown in fig. 6, a cross-sectional view of the soldering lug 30 in the soldering structure 100 of the package provided by the present utility model is shown. The soldering lug 30 provided by the utility model comprises a circular pad 31 and a third central hole 32 arranged at the center of the circular pad 31. The whole soldering lug 30 is in a flat pad type structure, so that mass production and processing are facilitated, and the total amount of solder used by each soldering lug 30 can be well controlled, so that the aim of controlling the processing cost is fulfilled. In the tube shell welding structure 100 provided by the utility model, due to the adoption of the flat pad type structure, the welding lug 30 can be processed by adopting the gold-nickel solder or the gold-copper solder with higher cost used by the traditional traveling wave tube composite tube shell 200, and can also be processed by adopting the oxygen-free copper solder with lower cost. In this embodiment, the soldering lug 30 provided by the utility model can be processed into the round pad 31 structure by using the oxygen-free copper solder with lower cost, and the oxygen-free copper solder can not only greatly reduce the processing cost of the soldering lug 30, but also has better thermal conductivity compared with the traditional gold-nickel solder or gold-copper solder after welding, thereby improving the heat dissipation effect of the pole shoe 10, and meanwhile, the oxygen-free copper solder has better tensile strength compared with the gold-nickel solder and is more suitable for being used in the pipe shell welding structure 100 provided by the utility model.

Further, as shown in fig. 2 and 3, in the case welding structure 100 provided by the present utility model, the third central holes 32 of the two welding lugs 30 are respectively sleeved at the two second annular bosses 23 of the connecting ring 20, so that the two welding lugs 30 are respectively disposed at two side surfaces of the connecting ring 20, and the two side surfaces of the welding lugs 30 can be respectively and completely attached to the welding surfaces of the pole shoes 10 and the welding surfaces of the connecting ring 20. During welding, the flow track of the welding lug 30 is melted between the second annular boss 23 of the connecting ring 20 and the side surface of the pole shoe 10, so that the welding of the joint surface of the pole shoe 10 and the connecting ring 20 is controllable during welding, the welding quality is ensured, and the overall strength after welding is ensured.

As shown in fig. 2, the outer diameter D3 of the circular spacer 31 of the lug 30 is equal to the outer diameter D1 of the second ring 21 of the connecting ring 20, so that the joint surface between the lug 30 and the connecting ring 20 can be completely bonded. In the actual welding process, the two side surfaces of the connecting ring 20 are both connecting surfaces fixed with the pole shoe 10, and when the outer diameter D3 of the circular pad 31 of the soldering lug 30 is equal to the outer diameter D1 of the second circular ring 21 of the connecting ring 20, the soldering lug 30 can completely cover the outer side surface of the connecting ring 20, thereby ensuring full-coverage solder during welding between the connecting ring 20 and the pole shoe 10.

To better utilize the tabs 30 to join the attachment ring 20 to the pole piece 10. The aperture L2 of the third central hole 32 of the lug 30 is equal to the outer diameter D2 of the second annular boss 23 of the connecting ring 20. In actual operation, the first center hole 12 of the pole shoe 10 is sleeved on the core bar; then, the two welding tabs 30 are respectively sleeved on the second annular bosses 23 at the two sides of the connecting ring 20; then, the connecting ring 20 sleeved with the soldering lug 30 is sleeved on the core bar; finally, a plurality of the tube-shell welding structures 100 provided by the utility model are sleeved on the core rod in a repeated and circulating way and then welded, and in the welding process, the welding lugs 30 are melted and connect the connecting rings 20 and the pole shoes 10 positioned at two sides into a whole, and finally the composite tube shell 200 is formed. If the aperture L2 of the third central hole 32 of the lug 30 is smaller than the outer diameter D2 of the second annular boss 23 of the connecting ring 20, the mounting of the lug 30 on both sides of the connecting ring 20 is not facilitated. If the aperture L2 of the third central hole 32 of the soldering lug 30 is larger than the outer diameter D2 of the second annular boss 23 of the connecting ring 20, the bottom of the core rod is easy to be hollowed out when the core rod is installed, and if the hollowed-out space is small, the gap can be filled in subsequent processing. If the hollow space is large, the welding quality of the pole shoe 10 and the connecting ring 20 is affected.

Further, in order to control the thickness of the whole of the shell-and-tube welded structure 100, it is ensured that the thickness of the whole of the shell-and-tube welded structure 100 is not greatly increased after the welding and the melting of the lug 30. As shown in fig. 2, the thickness H2 of the circular spacer 31 of the lug 30 disposed on the side of the connection ring 20 is equal to the height H1 of the second annular boss 23 of the connection ring 20, so that the lug 30 can sufficiently fill the gap enclosed by the second annular boss 23 of the connection ring 20 and the pole shoe 10 after melting. If the thickness H2 of the soldering lug 30 is greater than the height H1 of the second annular boss 23, the soldering lug 30 will cause a gap between the second annular boss 23 and the first annular boss 13 of the pole shoe 10 when being mounted, and during the soldering process, solder will flow into the first central hole 12 of the pole shoe 10 or the second central hole 22 of the connecting ring 20, thereby affecting the soldering quality of the composite envelope 200. If the thickness H2 of the welding tab 30 is smaller than the height H1 of the second annular boss 23, the welding tab 30 cannot fully fill the welding space formed between the pole piece 10 and the connecting ring 20 during welding, and the welding quality is also directly affected. In the traditional traveling wave tube composite tube shell, as the welding ring is sleeved on the outer side of the welding line, and the welding line is penetrated into the welding line along with capillary action, a gap between the pole shoe and the connecting ring can be expanded after the welding line is led to be filled with the welding material, so that the thickness of the whole structure is increased by 0.3-1.5 mm before welding, and the thickness of the whole structure after welding is uncontrollable and is not beneficial to batch processing of the follow-up traveling wave tube. By adopting the pipe shell welding structure 100 provided by the utility model, the welding lug 30 is sleeved on the outer side of the second annular boss 23 of the connecting ring 20, the thickness H2 of the welding lug 30 is controlled by the height H1 of the second annular boss 23, and the width of the welding seam between the pole shoe 10 and the connecting ring 20 is limited between the second annular bosses 23, so that the effect of controlling the whole thickness after welding is achieved, and the thickness of the whole pipe shell welding structure 100 after welding is controllable.

Specifically, as shown in fig. 2, in the case welding structure 100 provided by the present utility model, the outer diameter D1 of the second ring 21 of the connecting ring 20 is larger than the outer diameter D4 of the first annular boss 13 of the pole shoe 10, so that two side surfaces of the welding tab 30 can be completely attached to the outer side surface of the first annular boss 13 of the pole shoe 10 and the outer side surface of the connecting ring 20, thereby connecting the pole shoe 10 and the connecting ring 20 into a whole. The outer diameter D1 of the second ring 21 of the connecting ring 20 in the pipe shell welding structure 100 provided by the utility model is matched with the magnetic ring in the traveling wave pipe, namely the outer diameter D1 of the second ring 21 is the same as the inner diameter of the magnetic ring of the traveling wave pipe.

According to the pipe shell welding structure 100 provided by the utility model, the welding lug 30 is designed into a gasket type structure and is arranged on the side surfaces of the two sides of the connecting ring 20, and the welding lug 30 is directly arranged between the pole shoe 10 and the connecting ring 20, so that mass production and processing of the welding lug 30 can be facilitated during production, the use amount of welding materials can be accurately controlled, and the flow track of the welding lug 30 can be controlled during welding, so that the welding seam between the connecting ring 20 and the pole shoe 10 is uniform and consistent in thickness, the welding quality of the pipe shell welding structure 100 is improved, and the integral strength of the pipe shell welding structure 100 after welding is ensured. Meanwhile, in the tube shell welding structure 100, the second annular boss 23 is arranged on the side surface of the connecting ring 20 and used for placing the welding lug 30, so that a welding seam between the connecting ring 20 and the pole shoe 10 is a space enclosed between the second annular boss 23 and the pole shoe 10, the problem that the welding flux of the pole shoe 10 and the connecting ring 20 is not used due to processing errors can be solved, the effect of shaping the whole thickness of the pole shoe 10, the connecting ring 20 and the welding lug 30 is achieved, the thickness of the welded pole shoe 10 and the connecting ring 20 is controlled, the whole thickness of the welded tube shell welding structure 100 is accurately controlled, and the welded finished product rate is high.

As shown in fig. 7, the present utility model further provides a traveling wave tube composite tube shell 200, which is formed by welding a plurality of tube shell welding structures 100. The traveling wave tube composite tube shell 200 is formed by sequentially arranging and welding a plurality of tube shell welding structures 100. And the traveling wave tube composite envelope 200 is provided with a mounting hole 40 at the center thereof. The mounting hole 40 is a center hole that is secondarily machined at the center of the pole shoe 10 and the connection ring 20 after the welding is completed. The aperture L1 of the mounting hole 40 is larger than the aperture of the first central hole 12 of the pole piece 10 and also larger than the aperture of the second central hole 22 of the connecting ring 20. The mounting hole 40 is machined on the one hand to ensure that all pole shoes 10, connecting ring 20 are kept at the same aperture at the center and all on the same axis. On the other hand, the machining process of the mounting hole 40 can also improve the welding quality of the composite tube shell 100. In the actual machining process, after the welding and cooling of the welding lug 30, a tiny cavity is formed at the outer circular surface of the second annular boss 23 of the connecting ring 20, and when the aperture L1 of the mounting hole 40 is larger than the outer diameter D2 of the second annular boss 23, the second machining process of the mounting hole 40 can completely cut the second annular boss 23, and the tiny cavity around the outer part of the second annular boss 23 after welding can be removed together, so that the welding quality and the air tightness of the machined composite tube shell 200 can be greatly ensured.

The traveling wave tube composite tube shell 200 provided by the utility model adopts the tube shell welding structure 100, and the welding lug 30 is designed into a gasket type structure, so that the flow track of the welding lug 30 during welding can be controlled, the welding seam between the pole shoe 10 and the connecting ring 20 is uniform, the thickness is uniform, the whole length of the welded traveling wave tube composite tube shell 200 can be effectively controlled, and a good foundation is laid for the subsequent processing of the traveling wave tube; the welding quality and the overall strength of the welded traveling wave tube composite tube shell 200 can be improved, so that the welded traveling wave tube composite tube shell 200 can meet the production and processing requirements of traveling wave tube batch and consistency.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. The shell welding structure is characterized by comprising a pole shoe and a connecting ring which are coaxially arranged, and two welding pieces which are respectively arranged on the side surfaces of two sides of the connecting ring, wherein the pole shoe, the connecting ring and the two welding pieces are connected into a whole through welding;

the connecting ring comprises a second circular ring, a second central hole arranged at the center of the second circular ring and two second annular bosses which are respectively arranged at two sides of the second circular ring and are arranged around the second central hole;

the welding lug comprises a circular gasket and a third central hole arranged at the center of the circular gasket;

and the third center holes of the two welding lugs are respectively sleeved at the two second annular bosses of the connecting ring.

2. A cartridge welding structure as defined in claim 1, wherein the circular pad of said lug has an outer diameter equal to the outer diameter of the second ring of said attachment ring.

3. A cartridge weld as defined in claim 1, wherein the third central aperture of the lug has an aperture equal to the outer diameter of the second annular boss of the attachment ring.

4. A cartridge weld as defined in claim 1, wherein the thickness of the circular pad of the lug is equal to the height of the second annular boss of the attachment ring.

5. The package welding structure as defined in claim 1, wherein said connecting ring is made of a non-magnetic material, and said soldering lug is made of oxygen-free copper, gold copper or gold nickel.

6. A cartridge welding structure as defined in claim 1, wherein the pole piece includes a first ring, a first center hole provided at a center of the first ring, and two first annular bosses provided on both sides of the first ring, respectively, and surrounding the first center hole.

7. A cartridge weld assembly as defined in claim 6, wherein the second annular ring of the connecting ring has an outer diameter greater than an outer diameter of the first annular boss of the pole piece.

8. A cartridge weld assembly as defined in claim 6, wherein the first central bore of the pole piece is coaxially disposed with the second central bore of the connecting ring.

9. A traveling wave tube composite tube shell, characterized by being welded by a plurality of tube shell welded structures according to any one of claims 1-8.

10. The traveling wave tube composite tube shell as claimed in claim 9, wherein a mounting hole is provided at the center of the traveling wave tube composite tube shell, and the aperture of the mounting hole is larger than the outer diameter of the second annular boss.