CN107552995A - A kind of welding method and welding structure of titanium steel multiple tube - Google Patents

Abstract

The invention provides a welding method and welding structure of a titanium-steel composite pipe, belonging to the technical field of composite pipe welding, comprising the steps of: A. processing the pipe layer at the mouth of the titanium-steel composite pipe to be welded, and the outer pipe layer Each inner pipe layer inside is exposed in sequence and forms the reserved section of inner pipe layer respectively; B. welding the nozzle to be welded after step A; wherein, the reserved section of inner pipe layer of the innermost layer of the nozzle to be welded It is welded with the reserved section of the innermost layer of the other nozzle to be welded, and the outer pipe layer of the nozzle to be welded and the remaining sections of the inner pipe layer are respectively connected to the outer pipe layer and the other inner pipe layer of the nozzle to be welded. The reserved sections of the remaining inner pipe layers are welded one by one through corresponding connectors. The invention improves the welding strength, realizes the reliable welding of the titanium-steel composite pipe, and promotes the application and development of the titanium-steel composite pipe.

Description

A kind of welding method and welding structure of titanium-steel composite pipe

technical field

The invention belongs to the technical field of composite pipe welding, and in particular relates to a welding method and a welding structure of a titanium-steel composite pipe.

Background technique

The metal composite pipe is composed of two or more different materials, and the pipe layers are tightly combined through various deformation and connection techniques. The general design principle is that the base layer (carbon steel layer) meets the allowable stress of the pipeline design, and the cladding layer (alloy layer) to resist corrosion or abrasion, etc.

Since the metal composite pipe utilizes the best properties of the base material and cladding metal, it can effectively reduce the cost compared with the overall alloy pipe; and in the chloride and/or acidic environment that is sensitive to stress and corrosion cracking of the overall alloy pipe, Metal composite pipes can improve the safety and reliability of applications. Therefore, metal composite pipes have been widely used in highly corrosive fields such as petroleum, petrochemical enterprises, nuclear industries, medicine, and food processing.

At present, stainless steel clad pipes, nickel and nickel alloy clad pipes, and copper-steel clad pipes in metal clad pipes can all be butted by fusion welding, and high-quality weld structures can be obtained.

However, titanium-steel composite pipes are easy to form intermetallic brittle compounds due to Ti and Fe, Mn, Ni and other elements, so the direct welding method of fusion welding will form brittle joints, which not only has no practical value, but also restricts the use of titanium-steel composite pipes. The main factors of application and development.

Contents of the invention

In order to solve the above-mentioned problems existing in the prior art, the present invention provides a welding method and welding structure of titanium-steel composite pipes, so as to avoid the formation of brittle joints at the welded ends of titanium-steel composite pipes and promote the application and development of titanium-steel composite pipes .

The technical scheme adopted in the present invention is:

A welding method for a titanium-steel composite pipe, comprising the following steps:

A. Process the tube layer at the mouth of the titanium-steel composite tube to be welded, expose the inner tube layers in the outer tube layer in turn and form the reserved section of the inner tube layer respectively;

B. Weld the nozzle to be welded after being processed in step A; wherein, the reserved section of the innermost layer of the nozzle to be welded is carried out with the reserved section of the innermost layer of the innermost layer of the nozzle to be welded Welding, the outer pipe layer of the nozzle to be welded and the reserved sections of the remaining inner pipe layers are respectively welded with the outer pipe layer of the other nozzle to be welded and the reserved sections of the remaining inner pipe layers through corresponding connectors .

Preferably, the titanium-steel composite pipe is an outer layer steel-inner layer titanium structure; the welding method includes the following steps:

A. Cutting the tube layer of the titanium-steel composite tube to be welded, exposing the titanium tube layer in the steel tube layer and forming a reserved section of the titanium tube layer;

B. Weld the reserved section of the titanium tube layer of the nozzle to be welded after step A with the reserved section of the titanium tube layer of another nozzle to be welded;

C. Set the connecting piece outside the reserved section of the titanium tube layer of the nozzle to be welded, and connect the two ends of the connector with the steel pipe layer at the nozzle to be welded and the steel pipe layer at the other nozzle to be welded respectively. welding.

Preferably, the connector includes a semi-annular first support block and a semi-annular second support block, the first support block and the second support block are spliced into a ring; the inner diameter of the connector is the same as the The outer diameters of the reserved section of the titanium tube layer match, and the two end surfaces of the connecting piece are respectively attached to the cutout surfaces of the steel tube layer at the corresponding end.

Preferably, the inner ring surfaces of the first support block and the second support block are respectively provided with grooves for accommodating welding seams; the cross-sectional shapes of the first support block and the second support block are hexagonal shape; the sectional surface of the steel pipe layer is an inclined surface matching the two ends of the connecting piece, and the bottom waist of the connecting piece fits with the inclined surface, and the top waist of the connecting piece is formed with the inclined surface Triangular weld groove.

Preferably, the titanium-steel composite pipe is an outer titanium-inner steel structure, and the welding method includes the following steps:

A. Cutting the tube layer of the titanium-steel composite tube to be welded, exposing the steel tube layer in the titanium tube layer and forming a reserved section of the steel tube layer;

B. welding the reserved section of the steel pipe layer of the nozzle to be welded with the reserved section of the steel pipe layer of another nozzle to be welded after being processed in step A;

C. Install a connector outside the reserved section of the steel pipe layer at the nozzle to be welded, and connect the two ends of the connector with the titanium tube layer at the nozzle to be welded and the titanium tube layer at the other nozzle to be welded respectively Do the welding.

Preferably, the connector is a hollow sleeve; the inner diameter of the sleeve matches the outer diameter of the titanium tube layer, and the two ends of the sleeve are respectively welded to the outer surface of the titanium tube layer at the corresponding end , the sectional surface of the titanium tube layer is located in the casing.

Preferably, the sleeve is a titanium sleeve.

Preferably, the titanium-steel composite pipe is an outer titanium-middle steel-inner titanium structure; the welding method includes the following steps:

A. The pipe layer of the titanium-steel composite pipe to be welded is cut and processed, and the middle steel pipe layer and the inner titanium pipe layer in the outer titanium pipe layer are exposed in turn, and the reserved section of the middle steel pipe layer and the inner layer are respectively formed. Reserved section of titanium tube layer;

B. Weld the reserved section of the inner titanium tube layer of the nozzle to be welded with the reserved section of the inner titanium tube layer of another nozzle to be welded after being processed in step A;

C. Set the first connecting piece over the reserved section of the inner titanium tube layer of the nozzle to be welded, and connect the two ends of the first connecting piece with the reserved section of the middle steel pipe layer at the nozzle to be welded and the other 1. The reserved section of the middle steel pipe layer at the nozzle to be welded is welded;

D. Set the second connecting piece outside the first connecting piece, and connect the two ends of the second connecting piece with the outer titanium tube layer at the nozzle to be welded and the outer titanium tube at the other nozzle to be welded. Layers of titanium tubes are welded.

Preferably, the shape of the first connector is ring-shaped; the inner diameter of the first connector matches the outer diameter of the reserved section of the inner titanium tube layer, and the two ends of the first connector are respectively It fits with the sectional surface of the reserved section of the intermediate steel pipe layer at the corresponding end; the first connecting piece includes a semi-circular first support block and a second support block, and the first support block and the second support block The inner ring surface of each is respectively provided with grooves for accommodating weld seams;

The second connector is a hollow sleeve; the inner diameter of the sleeve matches the outer diameter of the outer titanium tube layer, and the two ends of the sleeve are respectively connected to the outer titanium tube layer at the corresponding end. The outer surface is welded, and the cut surface of the outer titanium tube layer is located in the casing.

Based on the above-mentioned welding method of titanium-steel composite pipe, the present invention also provides a welding structure of titanium-steel composite pipe, which includes: a first welded nozzle and a second welded nozzle; the first welded nozzle and the The second welded nozzles are respectively provided with an outer pipe layer and reserved sections of the inner pipe layers which are sequentially exposed;

The reserved section of the innermost inner pipe layer of the first welded nozzle is welded to the reserved section of the innermost inner pipe layer of the second welded nozzle, the outer pipe layer of the first welded nozzle and the rest Each reserved section of the inner pipe layer is respectively welded to the outer pipe layer of the second welding nozzle and the remaining reserved sections of the inner pipe layer through corresponding connecting pieces one by one.

The beneficial effects of the present invention are:

The welding method and welding structure of the titanium-steel composite pipe provided by the present invention directly weld the reserved section of the innermost layer of the pipe layer and pass the reserved sections of the outer pipe layer and the remaining inner pipe layers through corresponding The connecting parts are welded one by one, so that the welding ends of the pipe layers of different materials are welded separately, avoiding the brittle joints formed by the direct welding of titanium-steel composite pipes, so the welding strength is improved, and the reliable welding of titanium-steel composite pipes is realized. The application and development of titanium steel composite pipe.

Description of drawings

Fig. 1 is the structural representation of the steel pipe layer described in embodiment 1;

Fig. 2 is the structural representation of the first supporting block described in embodiment 1;

Fig. 3 is the welding structure schematic diagram described in embodiment 1;

Fig. 4 is the welding structure schematic diagram described in embodiment 2;

FIG. 5 is a schematic diagram of the welding structure described in Embodiment 3.

Labeled in the figure:

1. Reserved section of inner titanium tube layer; 2. Outer steel tube layer; 3. First support block; 4. Inner ring surface; 5. Groove; 6. Bottom waist; 7. Top waist; 8. Inner layer Steel pipe layer reserved section; 9, outer titanium pipe layer; 10, groove; 11, titanium casing; 12, middle steel pipe layer reserved section.

detailed description

Example 1

This embodiment provides a welding method for a titanium-steel composite pipe with an inner layer titanium-outer layer steel structure, which includes the following steps:

Processing of the nozzles to be welded of the titanium-steel composite pipe: machining the nozzles to be welded at the two ends of the titanium-steel composite pipe to be welded, exposing the inner titanium pipe layer in the outer steel pipe layer 2 and forming the inner titanium pipe layer Reserve segment 1. Preferably, the cut surface of the outer steel pipe layer 2 is a 120° slope; the reserved section 1 of the inner titanium pipe layer is reserved for 5-10 mm, and the surface of the reserved section 1 of the inner titanium pipe layer is machined to titanium 0.1-0.15mm below the joint surface of the pipe layer and the steel pipe layer.

Support block processing: There are two support blocks, namely the first support block and the second support block. The structure of the first support block and the second support block is the same, and two semi-rings that can be spliced to form a ring are processed by machining. support block. Among them, preferably, the cross-sectional shape of the two support blocks is hexagonal, the wall thickness is the same as that of the steel cladding tube layer, and the inner diameter is the tube outer diameter R+(0-0.02) of the reserved section 1 of the inner titanium tube layer mm; the angles between the inner ring surfaces 4 of the two support blocks and the two bottom waists 6 on both sides are 120°, the angles between the outer ring surfaces of the two support blocks and the two top waists 7 on both sides Both are 120°, and the waist corrugated at the junction of the bottom waist 6 and the top waist 7 of the support block is located at 1/3 of the wall thickness of the outer steel pipe layer 2. At the same time, the inner ring surfaces 4 of the two support blocks are also provided with a groove 5 distributed along the circumferential direction of the ring, which is used to accommodate the weld reinforcement at the butt joint end of the reserved section 1 of the inner titanium tube layer.

Through the support block, not only the outer steel pipe layer 2 can be connected to ensure the strength of the pipe-pipe butt joint; moreover, the support block has a binding force on the reserved section 1 of the inner titanium pipe layer, ensuring that the inner titanium pipe layer is reserved after welding. Segment 1 can withstand pressure.

Welding of the inner titanium tube layer: firstly align the nozzles of the two nozzles to be welded and ensure that the two tubes are concentric; welding, argon arc welding or friction stir welding to complete the welding of the inner titanium tube layer.

Support block welding: put two support blocks on the outside of the reserved section 1 of the inner titanium tube layer of the two nozzles to be welded, and splice them into a ring; the inner ring surface 4 of the two support blocks and the inner titanium tube layer The outer surface of the reserved end is attached, the bottom waist 6 on both sides of the inner ring surface 4 of the two support blocks is respectively attached to the cut surface of the corresponding outer steel pipe layer 2, and the two sides of the outer ring surface of the two support blocks The top waist 7 respectively forms a triangular welding groove with the cut surface of the corresponding outer steel pipe layer 2, and the welding groove is welded by manual arc welding, carbon dioxide gas shielded welding or submerged arc welding.

As shown in Figures 1-3, based on the above welding method, this embodiment also provides a welded structure of a titanium-steel composite pipe with an inner layer titanium-outer layer steel structure, which includes: a first welding nozzle and a second welding Nozzle; the first welded nozzle and the second welded nozzle are respectively provided with an outer steel tube layer 2 and an exposed inner titanium tube layer reserved section 1 .

Preferably, the sectional surface of the outer steel tube layer 2 is a slope of 120°; the reserved length of the reserved section 1 of the inner titanium tube layer is 5-10mm; the surface of the reserved section 1 of the inner titanium tube layer is located at the 0.1-0.15mm below the joint surface.

The first welded nozzle is docked with the second welded nozzle, and the reserved section 1 of the inner titanium tube layer of the first welded nozzle is welded with the reserved section 1 of the inner titanium tube layer of the second welded nozzle, and the first welding The outer steel pipe layer 2 of the nozzle and the outer steel pipe layer 2 of the second welded nozzle are welded by corresponding connecting pieces.

Wherein, preferably, the connector is two supporting blocks that can be spliced to form a ring-shaped semi-circular shape. The cross-sectional shape of the two supporting blocks is hexagonal, the wall thickness is the same as that of the outer steel pipe layer 2, and the inner diameter is The pipe outer diameter R+(0～0.02)mm of the reserved section 1 of the pipe layer; the included angles between the inner ring surfaces 4 of the two support blocks and the two bottom waists 6 on both sides are 120°, and the angles between the two support blocks The included angle between the outer ring surface and the two top waists 7 on both sides is 120°, and the waist corrugation at the connection between the bottom waist 6 and the top waist 7 of the support block is located at 1/3 of the wall thickness of the outer steel pipe layer 2 . At the same time, the inner ring surfaces 4 of the two support blocks are also provided with a groove 5 distributed along the circumferential direction of the ring, which is used to accommodate the weld reinforcement at the butt joint end of the reserved section 1 of the inner titanium tube layer.

The first support block 3 and the second support block are spliced into a ring, and are sleeved on the outer surface of the inner titanium tube layer reserved section 1 of the first welded nozzle and the second welded nozzle; the first support block 3 and the second The inner ring surface 4 of the support block is attached to the outer surface of the reserved section 1 of the inner titanium tube layer, and the bottom waist 6 of the first support block 3 and the second support block are both connected to the cutout of the outer steel tube layer 2 at the corresponding end. The top waist 7 forms a triangular welding groove with the cut surface of the outer steel pipe layer 2 at the corresponding end, and is welded at the welding groove.

Example 2

This embodiment provides a welding method for a titanium-steel composite pipe with an inner layer steel-outer layer titanium structure, which includes the following steps:

Processing of the nozzle to be welded of the titanium steel composite pipe: machining the nozzle to be welded at the two ends of the titanium steel composite pipe to be welded, removing the outer titanium pipe layer 9 and exposing the inner steel pipe layer in the outer titanium pipe layer 9 And form the reserved section 8 of the inner steel pipe layer. Preferably, the reserved length of the reserved section 8 of the inner steel pipe layer is 15-20mm; at the same time, a 30° groove 10 is processed on the end face of the reserved section 8 of the inner steel pipe layer, so that the reserved sections 8 of the two inner steel pipe layers After the butt joint, a triangular welding groove is formed on the outside of the butt end, which not only facilitates the welding process, but also improves the welding effect.

Processing of titanium sleeve 11: select titanium sleeve 11 of the same material as the outer titanium tube layer 9 for processing, wherein the inner diameter of the titanium sleeve 11 matches the outer diameter of the outer titanium tube layer 9, and the titanium sleeve 11 The wall thickness is consistent with the thickness of the outer titanium tube layer 9, and the length of the titanium sleeve 11 is 50±5mm.

Butt welding: first put the titanium sleeve 11 on one side of the titanium-steel composite pipe in advance, and then pair the nozzles of the two nozzles to be welded to ensure that the pipes are concentric; among them, the reserved section of the inner steel pipe layer 8 The butt joint ends are welded by manual arc welding, carbon dioxide gas shielded welding or submerged arc welding, and the weld reinforcement after welding is less than the thickness of the outer titanium tube layer 9.

Move the titanium sleeve 11 so that the titanium sleeve 11 is positioned at the outside of the reserved section 8 of the inner steel tube layer of the two nozzles to be welded, and connect the two ends of the titanium sleeve 11 with the outer sides of the corresponding outer titanium tube layer 9 respectively. The surface is welded by plasma welding, argon arc welding or friction stir welding, and a fillet weld is formed.

As shown in Figure 4, based on the above welding method, this embodiment also provides a welded structure of a titanium-steel composite pipe with an inner layer steel-outer layer titanium structure, which includes: a first welded nozzle and a second welded nozzle ; The first welded nozzle and the second welded nozzle are respectively provided with the outer titanium tube layer 9 and the reserved section 8 of the exposed inner steel tube layer. Preferably, the reserved length of the reserved section 8 of the inner steel pipe layer is 15-20 mm; and the end face of the reserved section 8 of the inner steel pipe layer is provided with a 30° bevel 10 .

The reserved section 8 of the inner steel pipe layer of the first welding nozzle is welded to the reserved section 8 of the inner steel pipe layer of the second welding nozzle, and the welding seam is located at the triangular welding groove formed by the two grooves 10; the first welding The outer titanium tube layer 9 of the nozzle and the outer titanium tube layer 9 of the second welded nozzle are welded by corresponding connecting pieces.

Preferably, the connector is a titanium sleeve 11, and the two ends of the titanium sleeve 11 are respectively welded to the outer surface of the outer titanium tube layer 9 of the first welded nozzle and the second welded nozzle, and formed at the welded end. Fillet welds. Wherein, the inner diameter of the titanium sleeve 11 matches the outer diameter of the outer titanium tube layer 9, the wall thickness of the titanium sleeve 11 is consistent with the thickness of the outer titanium tube layer 9, and the length of the titanium sleeve 11 is 50±5 mm.

In this embodiment, including but not limited to titanium sleeve 11, it can also be a hollow tube made of other welding materials that do not contain elements such as Fe, Mn, Ni, etc., so as to avoid contact with the outer titanium tube layer 9. Formation of intermetallic brittle compounds during welding.

Example 3

This embodiment provides a welding method for a titanium-steel composite pipe with an outer layer titanium-middle layer steel-inner layer titanium structure, which includes the following steps:

Processing of the nozzles to be welded of the titanium-steel composite pipe: Carry out mechanical processing on the two nozzles to be welded of the titanium-steel composite pipe, expose the middle steel pipe layer and the inner titanium pipe layer in the outer titanium pipe layer 9 sequentially and The reserved section 12 of the middle steel pipe layer and the reserved section 1 of the inner titanium pipe layer are respectively formed.

Wherein, preferably, the cut surface of the end face of the reserved section 12 of the middle steel pipe layer is a slope of 120°, and the reserved length of the reserved section 12 of the middle steel pipe layer is 15-20 mm; the reserved section 12 of the inner titanium pipe layer is reserved 5-10 mm is reserved, and the surface of the reserved section 1 of the inner titanium tube layer is machined to 0.1-0.15 mm below the joint surface of the middle steel tube layer and the inner titanium tube layer.

Support block processing: two semi-circular support blocks that can be spliced to form a ring are processed by machining. Wherein, preferably, the cross-sectional shape of the two support blocks is a regular hexagon, the wall thickness is the same as the thickness of the reserved section 12 of the middle steel pipe layer, and the inner diameter is the pipe outer diameter R+(0～ 0.02) mm; the angles between the inner ring surfaces 4 of the two support blocks and the two bottom waists 6 on both sides are 120°, and the angles between the outer ring surfaces of the two support blocks and the two top waists 7 on both sides The included angles are all 120°, and the girdle at the joint between the bottom waist 6 and the top waist 7 of the support block is located at 1/3 of the wall thickness of the reserved section 12 of the middle steel pipe layer. At the same time, the inner ring surfaces 4 of the two support blocks are also provided with a groove 5 distributed along the circumferential direction of the ring, which is used to accommodate the weld reinforcement of the butt joint end of the reserved section 1 of the inner titanium tube layer.

Processing of titanium sleeve 11: select titanium sleeve 11 of the same material as the outer titanium tube layer 9 for processing, the inner diameter of the processed titanium sleeve 11 matches the outer diameter of the outer titanium tube layer 9, and the titanium sleeve 11 The wall thickness is consistent with the thickness of the outer titanium tube layer 9.

Welding of the inner titanium tube layer: first, pair up the two nozzles to be welded and ensure that the two tubes are concentric; then connect the reserved section 1 of the inner titanium tube layer of the two nozzles to be welded, and use plasma welding, argon arc welding or friction stir welding.

Welding of the middle steel pipe layer: put two support blocks on the outside of the reserved section 12 of the middle steel pipe layer of the two nozzles to be welded, and splice them into a ring; the inner ring surface 4 of the two support blocks is connected with the inner titanium pipe layer The outer surfaces of the remaining ends are attached, the bottom waists 6 on both sides of the inner ring surface 4 of the two support blocks are respectively attached to the cut-out surface of the reserved section 12 of the middle steel pipe layer at the corresponding end, and the two sides of the outer ring surfaces of the two support blocks are The top waist 7 of the steel pipe respectively forms a triangular welding groove with the section surface of the reserved section 12 of the middle steel pipe layer at the corresponding end, and is welded at the welding groove by manual arc welding, carbon dioxide vapor shielded welding or submerged arc welding.

Welding of the outer titanium tube layer 9: move the titanium sleeve 11 so that the titanium sleeve 11 is located on the outside of the reserved section 12 of the middle steel tube layer of the two nozzles to be welded, and connect the two ends of the titanium sleeve 11 to the outer sides of the corresponding ends respectively. The outer surface of the titanium tube layer 9 is welded by plasma welding, argon arc welding or friction stir welding to form a fillet weld; wherein, preferably, the two ends of the titanium sleeve 11 are respectively connected to the outer titanium tube layer 9 at the corresponding end. The distance between the section surface is 30±5mm.

As shown in Figure 5, based on the above welding method, this embodiment also provides a welded structure of a titanium-steel composite pipe with an outer layer titanium-middle layer steel-inner layer titanium structure, which includes: a first welded nozzle and a second Welded nozzles; the first welded nozzle and the second welded nozzle are respectively provided with the outer titanium tube layer 9 and the reserved section 12 of the middle steel pipe layer and the reserved section 1 of the inner titanium tube layer exposed in sequence.

Preferably, the cut surface of the end face of the reserved section 12 of the middle steel pipe layer is a slope of 120°, and the reserved length of the reserved section 12 of the middle steel pipe layer is 15-20 mm; the reserved section 1 of the inner titanium pipe layer is reserved 5-10 mm, and the surface of the reserved section 1 of the inner titanium tube layer is machined to 0.1-0.15 mm below the joint surface of the middle steel tube layer and the inner titanium tube layer. At the same time, more specifically, the end face of the reserved section 1 of the inner titanium tube layer is provided with a 30° groove 10 .

The reserved section 1 of the inner titanium tube layer of the first welded nozzle is welded to the reserved section 1 of the inner titanium tube layer of the second welded nozzle, and the welding seam is located at the triangular welding groove formed by the two grooves 10; The reserved section 12 of the middle steel pipe layer of a welded nozzle and the reserved section 12 of the middle steel pipe layer of the second welded nozzle are welded by corresponding support blocks; the outer titanium pipe layer 9 of the first welded nozzle is connected with the second welded pipe The outer titanium tube layer 9 of the mouth is welded through the corresponding titanium sleeve 11 .

Wherein, the support block includes two semi-circular support blocks that can be spliced to form a ring. The pipe outer diameter R+(0～0.02)mm of the reserved section 1 of the pipe layer; the included angles between the inner ring surfaces 4 of the two support blocks and the two bottom waists 6 on both sides are 120°, and the angles between the two support blocks The included angle between the outer ring surface and the two top waists 7 on both sides is 120°, and the waist corrugation at the connection between the bottom waist 6 and the top waist 7 of the support block is located at 1/2 of the wall thickness of the reserved section 12 of the middle steel pipe layer. At the same time, a groove 5 distributed along the circumferential direction of the ring is also provided on the inner ring surface 4 of the two support blocks, which is used to accommodate the weld reinforcement at the butt joint end of the reserved section 1 of the inner titanium tube layer .

The inner diameter of the titanium sleeve 11 matches the outer diameter of the outer titanium tube layer 9 , and the wall thickness of the titanium sleeve 11 is consistent with the thickness of the outer titanium tube layer 9 .

The first support block 3 and the second support block are spliced into a ring, and are sleeved on the outer surface of the inner titanium tube layer reserved section 1 of the first welded nozzle and the second welded nozzle; the first support block 3 and the second The inner ring surface 4 of the support block is attached to the outer surface of the reserved section 1 of the inner titanium pipe layer, and the bottom waist 6 of the first support block 3 and the second support block are all connected with the reserved section 12 of the middle steel pipe layer at the corresponding end. The cut surface fits together, and the top waist 7 forms a triangular welding groove with the cut surface of the reserved section 12 of the middle steel pipe layer at the corresponding end, and is welded through the welding groove.

The two ends of the titanium casing 11 are welded to the outer surfaces of the outer titanium tube layer 9 of the first welding nozzle and the second welding nozzle respectively, and fillet welds are formed at the welding ends, and the two ends of the titanium casing 11 The distance from the cut surface of the outer titanium tube layer 9 at the corresponding end is 30±5mm.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a kind of welding method of titanium steel multiple tube, it is characterised in that comprise the following steps：

A. the tube layer at the mouth of pipe to be welded of titanium steel multiple tube is processed, by each interior tube layer in external tube layer successively exposure simultaneously Formed inner tube layer reserves section respectively；

B. the mouth of pipe to be welded after processing of step A is welded；Wherein, the interior tube layer of mouth of pipe innermost layer to be welded reserves section Section is reserved with the interior tube layer of another mouth of pipe innermost layer to be welded to be welded, the external tube layer of the mouth of pipe to be welded and remaining each interior tube layer Reserved section reserves section with the external tube layer of another mouth of pipe to be welded and remaining each interior tube layer and passes through a pair of corresponding connector 1 respectively It should be welded.

2. the welding method of titanium steel multiple tube according to claim 1, it is characterised in that the titanium steel multiple tube is outer layer Steel-internal layer titanium structure；The welding method comprises the following steps：

A. cutting processing is carried out to the tube layer of the mouth of pipe to be welded of titanium steel multiple tube, by the titanium tube layer exposure in steel pipe layer and formed Titanium tube layer reserves section；

B. the titanium tube layer of the mouth of pipe to be welded after processing of step A is reserved into section and the titanium tube layer of another mouth of pipe to be welded reserves section Welded；

C. reserve in the titanium tube layer of the mouth of pipe to be welded and be arranged connector outside section, and by the both ends of the connector respectively with it is to be welded The steel pipe layer at steel pipe layer and another mouth of pipe to be welded at the mouth of pipe is welded.

3. the welding method of titanium steel multiple tube according to claim 2, it is characterised in that the connector includes semi-circular The first support block and semiorbicular second support block, first support block and second support block splicing circularize；Institute State connector internal diameter and the titanium tube layer reserve section external diameter match, and the both ends of the surface of the connector respectively with respective end Steel pipe layer groove face fitting.

4. the welding method of titanium steel multiple tube according to claim 3, it is characterised in that first support block and described The inner ring surface of second support block is separately provided for accommodating the groove of weld seam；First support block and second support block Cross sectional shape be hexagon；The groove face of the steel pipe layer is the inclined-plane being engaged with the connector both ends of the surface, and described The bottom waist of connector and inclined-plane fitting, the top waist of the connector form the welding groove of triangle with the inclined-plane.

5. the welding method of titanium steel multiple tube according to claim 1, it is characterised in that the titanium steel multiple tube is outer layer Titanium-internal layer steel construction, the welding method comprise the following steps：

A. cutting processing is carried out to the tube layer of the mouth of pipe to be welded of titanium steel multiple tube, by the steel pipe layer exposure in titanium tube layer and formed Steel pipe layer reserves section；

B. the steel pipe layer of the mouth of pipe to be welded after processing of step A is reserved into section and the steel pipe layer of another mouth of pipe to be welded reserves section Welded；

C. reserve in the steel pipe layer of the mouth of pipe to be welded and be arranged connector outside section, and by the both ends of the connector respectively with it is to be welded The titanium tube layer at titanium tube layer and another mouth of pipe to be welded at the mouth of pipe is welded.

6. the welding method of titanium steel multiple tube according to claim 5, it is characterised in that the connector is hollow set Pipe；The external diameter of the internal diameter of described sleeve pipe and the titanium tube layer matches, and the both ends of the described sleeve pipe titanium tube with respective end respectively The outer surface welding of layer, the groove face of the titanium tube layer is located in described sleeve pipe.

7. the welding method of titanium steel multiple tube according to claim 6, it is characterised in that described sleeve pipe is titanium sleeve pipe.

8. the welding method of titanium steel multiple tube according to claim 1, it is characterised in that the titanium steel multiple tube is outer layer Titanium-middle level steel-internal layer titanium structure；The welding method comprises the following steps：

A. cutting processing is carried out to the tube layer of the mouth of pipe to be welded of titanium steel multiple tube, exposes the middle level steel in outer layer titanium tube layer successively Tube layer and internal layer titanium tube layer simultaneously form the reserved section of middle level steel pipe layer and the reserved section of internal layer titanium tube layer respectively；

B. the internal layer titanium tube layer of the mouth of pipe to be welded after processing of step A is reserved into section and the internal layer titanium tube of another mouth of pipe to be welded The reserved section of layer is welded；

C. reserve in the internal layer titanium tube layer of the mouth of pipe to be welded and be arranged the first connector outside section, and by the both ends of first connector The middle level steel pipe layer at section and another mouth of pipe to be welded is reserved with the middle level steel pipe layer at the mouth of pipe to be welded respectively and reserves section progress Welding；

D. be arranged the second connector outside first connector, and by the both ends of second connector respectively with adapter to be welded Outer layer titanium tube layer at mouthful and the outer layer titanium tube layer at another mouth of pipe to be welded are welded.

9. the welding method of titanium steel multiple tube according to claim 8, it is characterised in that the shape of first connector For annular；The external diameter that the internal diameter of first connector reserves section with the internal layer titanium tube layer matches, and first connection The groove face that the both ends of the surface of part reserve section with the middle level steel pipe layer of respective end respectively is bonded；First connector includes semi-circular The first support block and the second support block, and the inner ring surface of first support block and second support block is respectively arranged with use In the groove for accommodating weld seam；

Second connector is hollow sleeve pipe；The external diameter of the internal diameter of described sleeve pipe and the outer layer titanium tube layer matches, and The both ends of described sleeve pipe are welded with the outer surface of the outer layer titanium tube layer of respective end respectively, and the groove face of the outer layer titanium tube layer is located at In described sleeve pipe.

10. a kind of welding structure of titanium steel multiple tube, it is characterised in that including the first welding mouth of pipe and the second welding mouth of pipe；Institute State the first welding mouth of pipe and the second welding mouth of pipe is respectively provided with outer tube and each interior tube layer of exposure is reserved successively Section；

The interior tube layer of the first welding mouth of pipe innermost layer reserves section and the interior tube layer of the described second welding mouth of pipe innermost layer is reserved It is outer with the described second welding mouth of pipe respectively that section welding, the external tube layer of the first welding mouth of pipe and remaining each interior tube layer reserve section Tube layer and remaining each interior tube layer reserve section and correspond welding by corresponding connector.