CN113070596B - Steel pipe embedded type bidirectional welding process - Google Patents
Steel pipe embedded type bidirectional welding process Download PDFInfo
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- CN113070596B CN113070596B CN202110020810.3A CN202110020810A CN113070596B CN 113070596 B CN113070596 B CN 113070596B CN 202110020810 A CN202110020810 A CN 202110020810A CN 113070596 B CN113070596 B CN 113070596B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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Abstract
The invention discloses a steel pipe embedded two-way welding process, belonging to the welding field, a steel pipe embedded two-way welding process, through the arrangement of two-way welding-assisted pipes, when welding at high temperature, an outer-coated welding sheet can form radial welding seams on the cross sections of two steel pipes, an inner welding powder block is melted to be contacted with the inner wall of the steel pipe after being heated, a transverse welding seam can be formed inside, compared with the prior art which only has a radial welding seam, the welding strength is obviously improved, the welded steel pipe is not easy to crack and break, meanwhile, the high heat-conducting gas expands after being heated by matching with the temporary sealing environment in the transverse welding pipe, on one hand, the melted inner welding powder block is pushed by a metal elastic sheet, a welding layer formed by the melted inner welding powder block and the inner wall of the steel pipe is more compact and stable, the welding strength is further improved, on the other hand, the high heat-conducting gas pushes a hollow pre-sealed ball to be separated from the transverse welding pipe to be contacted with the sealing performance of the transverse welding pipe, effectively avoiding the high heat-conducting gas of the expansion from easily causing the explosion of the transverse welded pipe due to the over expansion.
Description
Technical Field
The invention relates to the field of welding, in particular to a steel pipe embedded type bidirectional welding process.
Background
Welding, also known as fusion welding, is a manufacturing process and technique for joining metals or other thermoplastic materials, such as plastics, in a heated, high temperature or high pressure manner.
The energy sources for modern welding are many, including gas flame, electric arc, laser, electron beam, friction, and ultrasonic, among others. In addition to use in a factory, welding can be performed in a variety of environments, such as the field, underwater, and space. Wherever welding can be dangerous for the operator, appropriate precautions must be taken while welding is being performed. The possible injuries to human body caused by welding include burn, electric shock, visual impairment, toxic gas inhalation, over-irradiation of ultraviolet rays, etc.
In the conventional welding of two steel pipes, the two steel pipes are generally welded at the cross section where they are close to each other, and the connection is achieved only at the cross section.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a steel tube embedded type two-way welding process, through the arrangement of a two-way welding-aid tube, when in high-temperature welding, an outer wrapping welding sheet can form radial welding seams on the sections of two steel tubes, an inner welding powder block is melted to be contacted with the inner walls of the steel tubes after being heated, a transverse welding seam can be formed inside, compared with the prior art that only radial welding seams are used, the welding strength is obviously improved, the welded steel tubes are not easy to crack and break, meanwhile, the high heat-conducting gas expands after being heated by matching with the temporary sealing environment in the transverse welding tube, on one hand, the melted inner welding powder block is pushed by a metal elastic sheet, a welding layer formed by the melted inner welding powder block and the inner walls of the steel tubes is more compact and stable, the welding strength is further improved, on the other hand, the high heat-conducting gas pushes a hollow pre-sealing ball to be separated from the transverse welding tube to be contacted with the sealing performance of the transverse welding tube, effectively avoiding the high heat-conducting gas of the expansion from easily causing the explosion of the transverse welded pipe due to the over expansion.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A steel pipe embedded type bidirectional welding process comprises the following steps:
s1, firstly, carrying out rust and oil removal treatment on the to-be-welded part of the steel pipe, and cleaning and drying;
s2, tearing off the protective film on the outer surface of the bidirectional welding-assistant tube, then clamping one end of the protective film into the end of the steel tube to be welded, clamping the other steel tube to be welded into the other end of the bidirectional welding-assistant tube and compacting the steel tube;
s3, aligning the middle parts of the two steel pipes for welding:
s31, heating and melting the middle part of the bidirectional welding-assistant pipe, and gradually and uniformly contacting the side walls, close to each other, of the two steel pipes to form a radial welding seam;
s32, gradually melting the two ends of the bidirectional welding-assistant tube, and gradually expanding the high-heat-conductivity gas in the bidirectional welding-assistant tube to push the upper melting part of the bidirectional welding-assistant tube to fully contact with the inner wall of the steel tube to form a transverse welding line;
and S4, standing, cooling, knocking to remove welding slag, and polishing to finish welding.
Furthermore, before installation in S2, at first tear the protection film of two-way welding-assistant pipe surface, the protection film can effectively protect interior welding powder piece and be difficult for spilling because of accident colliding with, makes when welding, and the welding layer that two-way welding-assistant pipe and steel pipe inner wall formed is comparatively even, makes welding strength higher, and the protection film effectively protects interior welding powder piece when not using is difficult for oxidizing with the outside air contact, makes welding strength better when welding simultaneously.
Furthermore, when the welding is carried out in S3, the two steel pipes are respectively extruded towards the positions of the two-way welding-assistant pipes, so that the welding strength between the sections of the two steel pipes and the two-way welding-assistant pipes is higher, and a gap is not easy to exist in a welding seam formed by the melted outer wrapping welding sheet.
Further, two-way welding-assistant pipe includes radial soldering lug, two horizontal welding pipes at both ends about radial soldering lug fixed connection respectively, it has the inlay powder groove to open the chisel to horizontal welding pipe outer end, it has interior welding powder piece to inlay in the powder groove, the protection film parcel is at horizontal welding pipe surface, and protection film and interior welding powder piece are attached to each other, and during the welding, on the one hand, radial soldering lug melts under the high temperature effect, can form radial welding seam at the cross-section that two steel pipes are close to each other, and on the other hand, interior welding powder piece melts and fully contacts with the steel pipe inner wall after being heated, can form horizontal welding seam in inside after the cooling, and two-way welding effectively improves the welding effect, makes the difficult fracture disconnection of steel pipe after the welding.
Further, interior welding powder piece is formed for the metal powder suppression, and interior welding powder piece is that the melting point is less than the metal material of steel pipe and makes, and it is located for the outsourcing soldering lug, and there is a certain distance apart from the welding, and the temperature does not have outsourcing soldering lug department high, therefore the melting point is lower, makes it equally can melt the welding that realizes from inside, and interior welding powder piece upper surface and horizontal welded tube surface looks parallel and level, makes the welded layer of formation more closely knit even, is difficult for there being the space.
Furthermore, the radial welding piece comprises an embedded framework layer and an outer coating welding piece wrapped on the outer surface of the embedded framework layer, the outer coating welding piece is wrapped by a coating far away from the surface of the transverse welding pipe, the coating surface is in a plurality of convex hemispherical shapes, so that welding slag cannot be generated or is not easy to generate on the part of the outer coating welding piece contacting with the end part of the steel pipe during welding, and meanwhile, the coating on the outer side of the outer coating welding piece is melted to generate gas, and the purpose of carrying out physical protection on a welding position can be achieved.
Further, horizontal welded tube is hollow structure, and horizontal welded tube is inside to be filled has high heat-conducting gas, make under the welded high temperature condition, high heat-conducting gas is heated the inflation, thereby can produce the motive force to the metal shrapnel, this motive force acts on interior welding powder piece, and produce the extrusion force to it, and then make the welded layer that fused interior welding powder piece and steel pipe inner wall formed more closely knit and stable, further improve welding strength, and high heat-conducting gas's fillibility is not less than 80%, the filling volume is too much, lead to it to be heated the back quick expansion easily, lead to hollow pre-sealing ball to be extruded fast and go out, and lead to gaseous promotion effect variation to interior welding powder piece, fill too little, can produce the motive force to interior welding powder piece after leading to its inflation several times easily.
Furthermore, vent top holes are formed in the upper inner wall and the lower inner wall of the transverse welding pipe and are communicated with the hollow part in the transverse welding pipe and the powder embedding groove, a metal elastic sheet is arranged at the inner bottom end of the powder embedding groove, the edge of the metal elastic sheet is fixedly connected with the powder embedding groove, and other parts of the metal elastic sheet are in contact with the inner bottom end of the powder embedding groove.
Further, the tip that radial soldering lug was kept away from to horizontal welded pipe is opened and is dug there is the special-shaped hole sealing, hollow pre-sealing ball has been placed at the special-shaped hole sealing middle part, and the hole diameter of special-shaped hole sealing towards inboard oral area is less than the hole diameter of special-shaped hole sealing towards outside oral area, effectively guarantees the special-shaped hole sealing under the effect of received force, is difficult for dropping towards the inboard oral area department of special-shaped hole sealing, makes it outwards drop to can follow steel pipe other end oral area and take out the recovery, the reuse of the resource of being convenient for.
Further, hollow pre-sealing ball is hollow stainless steel ball, and its inside packing has the air that is not less than 80%, and hollow pre-sealing ball diameter is greater than the aperture of dysmorphism hole sealing towards the outside oral area, make it be difficult for coming off from special-shaped hole sealing under the normal condition, under the very big gaseous driving force in inside, hollow stainless steel atress deformation, extruded in the special-shaped hole sealing gradually, it is penetrating inside and outside messenger's horizontal welded tube, thereby effectively avoid the high heat-conducting gas of inflation to be difficult for causing because of the inflation excessively bursting apart of welding department, effectively alleviate the gaseous limit of the high heat-conducting gas of inflation.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) by the arrangement of the bidirectional welding-assistant pipe, the outer wrapping welding sheet can form a radial welding seam on the cross section of the two steel pipes during high-temperature welding, the inner welding powder block is melted after being heated and contacts with the inner wall of the steel pipe, can form a transverse welding seam inside, obviously improves the welding strength compared with the prior art which only has a radial welding seam, ensures that the welded steel pipe is not easy to crack and break, the interior temporarily sealed environment of horizontal welded tube of cooperation simultaneously, the high heat conduction gas inflation of back of being heated, promote the interior welding powder piece of melting through the metal shrapnel on the one hand, make the welding layer that interior welding powder piece of melting and steel pipe inner wall formed more closely knit and stable, further improve welding strength, the high heat conduction gas of the other hand promotes hollow pre-sealing ball, make it break away from horizontal welded tube, the leakproofness of contact horizontal welded tube, effectively avoid the high heat conduction gas of inflation to be difficult for leading to horizontal welded tube to explode because of the inflation is excessive.
(2) Before installation in S2, the protective film on the outer surface of the bidirectional welding-assistant tube is firstly torn off, the protective film can effectively protect the inner welding powder block from being accidentally spilled due to accidental collision, so that a welding layer formed by the bidirectional welding-assistant tube and the inner wall of the steel tube is relatively uniform during welding, the welding strength is relatively high, and meanwhile, the protective film effectively protects the inner welding powder block from being oxidized due to contact with the outside air when the bidirectional welding-assistant tube is not used, and the welding strength is relatively good during welding.
(3) And S3, when welding, respectively extruding the two steel pipes towards the positions of the two-way welding-assistant pipes, so that the welding strength between the sections of the two steel pipes and the two-way welding-assistant pipes is higher, and a gap is not easy to exist in a welding seam formed by the melted outer wrapping welding sheet.
(4) The bidirectional welding-assisting pipe comprises a radial welding sheet, two transverse welding pipes which are fixedly connected to the left end and the right end of the radial welding sheet respectively, a powder embedding groove is formed in the outer end of each transverse welding pipe, an inner welding powder block is embedded in the powder embedding groove, a protective film wraps the outer surface of each transverse welding pipe, the protective film is attached to the inner welding powder block, during welding, on one hand, the radial welding sheets are melted under the action of high temperature, radial welding seams can be formed on the cross sections, close to each other, of the two steel pipes, on the other hand, the inner welding powder blocks are melted and fully contacted with the inner wall of each steel pipe after being heated, after cooling, transverse welding seams can be formed inside, bidirectional welding is achieved, the welding effect is effectively improved, and the welded steel pipes are not prone to cracking and breaking.
(5) Interior welding powder piece is formed for the metal powder suppression, and interior welding powder piece is made for the metal material that the fusing point is less than the steel pipe, and it is located for the outsourcing soldering lug, and there is the certain distance apart from the welding, and the temperature does not have outsourcing soldering lug department high, therefore the fusing point is lower, makes it to melt the welding that realizes from inside equally, and interior welding powder piece upper surface and horizontal welded tube surface looks parallel and level, makes the welded layer of formation more closely knit even, is difficult for there being the space.
(6) The radial welding piece comprises an embedded framework layer and an outer coating welding piece wrapped on the outer surface of the embedded framework layer, a coating is wrapped on the surface, far away from the transverse welding pipe, of the outer coating welding piece, the surface of the coating is in a plurality of convex hemispherical shapes, so that welding slag cannot be generated or is not easily generated on the contact part of the outer coating welding piece and the end part of the steel pipe during welding, meanwhile, the coating on the outer side of the outer coating welding piece is melted to generate gas, and the purpose of performing physical protection on a welding part can be achieved.
(7) Horizontal welded tube is hollow structure, and horizontal welded tube inside packing has high heat-conducting gas, make under the welded high temperature condition, high heat-conducting gas is heated the inflation, thereby can produce the motive force to metal shrapnel, this motive force is used in interior welding powder piece, and to its production extrusion force, and then make the welded layer that fused interior welding powder piece and steel pipe inner wall formed more closely knit stable, further improve welding strength, and high heat-conducting gas's filling degree is not less than 80%, the filling volume is too much, lead to its quick inflation after being heated easily, lead to hollow pre-sealed ball to be extruded fast and go out, and lead to gaseous promotion effect variation to interior welding powder piece, it is too few to fill, lead to just to producing the motive force to interior welding powder piece after its inflation several times easily.
(8) The upper inner wall and the lower inner wall of the transverse welding pipe are provided with vent top holes, the vent top holes are communicated with a hollow part in the transverse welding pipe and a powder embedding groove, a metal elastic sheet is arranged at the bottom end in the powder embedding groove, the edge of the metal elastic sheet is fixedly connected with the powder embedding groove, and other parts of the metal elastic sheet are in contact with the bottom end in the powder embedding groove.
(9) The tip that radial soldering lug was kept away from to horizontal welded tube is opened and is dug there is special-shaped hole sealing, and hollow pre-sealing ball has been placed at special-shaped hole sealing middle part, and the hole diameter of special-shaped hole sealing towards inboard oral area is less than the hole diameter of special-shaped hole sealing towards outside oral area, effectively guarantees special-shaped hole sealing under the effect of force of receiving, is difficult for dropping towards the inboard oral area department of special-shaped hole sealing, makes it outwards drop to can follow steel pipe other end oral area and take out the recovery, the recycling of the resource of being convenient for.
(10) Hollow pre-sealing ball is hollow stainless steel ball, and its inside packing has the air that is not less than 80%, and hollow pre-sealing ball diameter is greater than the aperture of dysmorphism hole sealing towards outside oral area, make it be difficult for coming off from special-shaped hole sealing under the normal condition, under the very big gaseous driving force in inside, hollow stainless steel atress deformation, extruded in the special-shaped hole sealing gradually, it is penetrating inside and outside messenger's horizontal welded tube, thereby effectively avoid expanded high heat-conducting gas to be difficult for causing the collapse of welding department because of the inflation is excessive, effectively alleviate expanded high heat-conducting gas's limit.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a schematic view of the present invention in a configuration where a radial weld and a transverse weld are formed after step S3;
FIG. 3 is a schematic three-dimensional structure of a two-way welding-assistant tube according to the present invention;
FIG. 4 is a schematic structural view of a cross section of a bidirectional fluxing tube of the present invention;
FIG. 5 is a schematic view of the structure at A in FIG. 4;
fig. 6 is a schematic structural view of the special-shaped hole sealing part of the present invention.
The reference numbers in the figures illustrate:
the welding method comprises the following steps of 1 radial welding sheet, 11 embedded framework layers, 12 outer wrapped welding sheets, 2 transverse welding pipes, 3 inner welding powder blocks, 5 hollow pre-sealing balls, 6 special-shaped sealing holes, 7 ventilation top holes and 8 metal elastic sheets.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1, a steel pipe embedded type bidirectional welding process includes the following steps:
s1, firstly, carrying out rust and oil removal treatment on the to-be-welded part of the steel pipe, and cleaning and drying;
s2, tearing off the protective film on the outer surface of the bidirectional welding-assistant tube, clamping one end of the protective film into the end of the steel tube to be welded, clamping the other steel tube to be welded into the other end of the bidirectional welding-assistant tube, and compacting;
s3, referring to fig. 2, wherein a represents a steel pipe, b represents a radial weld, c represents a transverse weld, and the middle parts of the two steel pipes are aligned for welding:
s31, heating and melting the middle part of the bidirectional welding-assistant pipe, and gradually and uniformly contacting the side walls, close to each other, of the two steel pipes to form a radial welding seam;
s32, gradually melting the two ends of the bidirectional welding-assistant tube, and gradually expanding the high-heat-conductivity gas in the bidirectional welding-assistant tube to push the upper melting part of the bidirectional welding-assistant tube to fully contact with the inner wall of the steel tube to form a transverse welding line;
and S4, standing, cooling, knocking to remove welding slag, and polishing to finish welding.
Before installation in S2, firstly, the protective film on the outer surface of the bidirectional welding-assistant tube is torn off, the protective film can effectively protect the inner welding powder block 3 from accidental dropping due to accidental collision, so that a welding layer formed by the bidirectional welding-assistant tube and the inner wall of the steel tube is relatively uniform during welding, the welding strength is relatively high, meanwhile, the protective film effectively protects the inner welding powder block 3 from oxidation due to contact with the outside air when the inner welding powder block is not used, the welding strength is relatively good during welding, when welding in S3, the two steel tubes are respectively extruded towards the positions of the bidirectional welding-assistant tube, the welding strength between the sections of the two steel tubes and the bidirectional welding-assistant tube is relatively high, and gaps are not easily formed in a welding seam formed by the melted outer-coated welding piece 12.
Referring to fig. 3, the bidirectional welding-assisted pipe includes a radial welding plate 1, two transverse welding pipes 2 fixedly connected to the left and right ends of the radial welding plate 1, respectively, a powder embedding slot is drilled at the outer end of each transverse welding pipe 2, an inner welding powder block 3 is embedded in the powder embedding slot, a protective film wraps the outer surface of each transverse welding pipe 2, and the protective film and the inner welding powder block 3 are attached to each other, when welding, on one hand, the radial welding plate 1 is melted under the action of high temperature, a radial welding seam can be formed on the cross section of the two steel pipes close to each other, on the other hand, the inner welding powder block 3 is melted and fully contacted with the inner wall of the steel pipe after being heated, after cooling, a transverse welding seam can be formed inside, bidirectional welding is achieved, the welding effect is effectively improved, the welded steel pipe is not easy to crack and break, the inner welding powder block 3 is formed by pressing metal powder, the inner welding powder block 3 is made of metal material with a melting point lower than that of the steel pipe, and is opposite to the outer welding plate 12, there is certain distance apart from the welding department, and the temperature does not have outsourcing soldering lug 12 department height, therefore the melting point is lower, makes it equally can melt and realize from inside welding, and interior welding powder piece 3 upper surface and horizontal welded tube 2 surface looks parallel and level, makes the welding layer of formation closely knit even, is difficult for having the space.
Referring to fig. 4, a radial welding sheet 1 comprises an embedded framework layer 11 and an outer coating welding sheet 12 coated on the outer surface of the embedded framework layer 11, the surface of the outer coating welding sheet 12 far away from a transverse welding pipe 2 is coated with a coating, the surface of the coating is in a plurality of convex hemispherical shapes, so that when welding is carried out, welding slag is not generated or is not easily generated on the contact part of the outer coating welding sheet 12 and the end part of a steel pipe, meanwhile, the coating on the outer side is melted to generate gas, and physical protection can be carried out on a welding position, the transverse welding pipe 2 is in a hollow structure, high heat conduction gas is filled in the transverse welding pipe 2, referring to fig. 5, vent top holes 7 are formed in the upper inner wall and the lower inner wall of the transverse welding pipe 2, the vent top holes 7 are communicated with a hollow part in the transverse welding pipe 2 and a powder embedding groove, a metal elastic sheet 8 is arranged at the inner bottom end of the powder embedding groove, the edge of the metal elastic sheet 8 is fixedly connected with the powder embedding groove, and other parts of the metal elastic sheet 8 are contacted with the inner bottom end of the powder embedding groove, the feasible under the welded high temperature condition, high heat conduction gas is heated the inflation, thereby can produce the motive force to metal shrapnel 8, this motive force is used in welding powder piece 3, and produce the extrusion force to it, and then make the welded layer that fused interior welding powder piece 3 and steel pipe inner wall formed more closely knit stable, further improve welding strength, and high heat conduction gas's filling degree is not less than 80%, the filling volume is too much, lead to its back quick expansion of being heated easily, lead to hollow ball 5 of sealing in advance to be extruded fast and go out, and lead to gaseous promotion effect variation to interior welding powder piece 3, it is too few to fill, just can produce the motive force to interior welding powder piece 3 after leading to its inflation several times easily.
Referring to fig. 6, the end of the transverse welded pipe 2 far away from the radial welding piece 1 is chiseled with a special-shaped hole sealing 6, a hollow pre-sealing ball 5 is placed in the middle of the special-shaped hole sealing 6, and the aperture of the special-shaped hole sealing 6 towards the inner side opening is smaller than the aperture of the special-shaped hole sealing 6 towards the outer side opening, so that the special-shaped hole sealing 6 is effectively ensured not to fall towards the inner side opening of the special-shaped hole sealing 6 under the action of force, so that the special-shaped hole sealing 6 can fall outwards and can be taken out from the other end opening of the steel pipe for recycling, resources are convenient to recycle, the hollow pre-sealing ball 5 is a hollow stainless steel ball, air is filled in the hollow pre-sealing ball 5 not less than 80%, the diameter of the hollow pre-sealing ball 5 is larger than the aperture of the special-shaped hole sealing 6 towards the outer side opening, so that the hollow stainless steel ball is not easy to fall off from the special-shaped hole sealing 6 under normal condition, and is deformed under the action of force of the inner part and is gradually extruded from the special-shaped hole sealing 6, make horizontal welded tube 2 inside and outside penetrating to effectively avoid the high heat-conducting gas of inflation to be difficult for causing the bursting apart of welding department because of the inflation is excessive, effectively alleviate the high heat-conducting gas's of inflation limit.
Through the arrangement of the bidirectional auxiliary welding pipe, when the bidirectional auxiliary welding pipe is welded at high temperature, the outer coating welding lug 12 can form radial welding seams on the cross sections of two steel pipes, the inner welding powder block 3 is melted after being heated and is contacted with the inner wall of the steel pipe, a transverse welding seam can be formed inside, compared with the only radial welding seam in the prior art, the welding strength is obviously improved, the welded steel pipe is not easy to crack and break, meanwhile, the high heat-conducting gas is expanded by matching with the temporarily sealed environment in the transverse welding pipe 2, on one hand, the melted inner welding powder block 3 is pushed by the metal elastic sheet 8, the welded layer formed by the melted inner welding powder block 3 and the inner wall of the steel pipe is more compact, the welding strength is further improved, on the other hand, the high heat-conducting gas pushes the hollow pre-sealing ball 5 to be separated from the transverse welding pipe 2 and is contacted with the tightness of the transverse welding pipe 2, and the expanded high heat-conducting gas is effectively prevented from being not easy to crack the transverse welding pipe 2 due to over expansion, and the potential safety hazard is reduced.
The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.
Claims (5)
1. The steel pipe embedded type bidirectional welding process is characterized in that: the method comprises the following steps:
s1, firstly, carrying out rust and oil removal treatment on the to-be-welded part of the steel pipe, and cleaning and drying;
s2, tearing off the protective film on the outer surface of the bidirectional welding-assistant tube, clamping one end of the protective film into the end of the steel tube to be welded, clamping the other steel tube to be welded into the other end of the bidirectional welding-assistant tube, and compacting;
s3, aligning the middle parts of the two steel pipes for welding:
s31, heating and melting the middle part of the bidirectional welding-assistant pipe, and gradually and uniformly contacting the side walls, close to each other, of the two steel pipes to form a radial welding seam;
s32, gradually melting the two ends of the bidirectional welding-assistant tube, and gradually expanding the high-heat-conductivity gas in the bidirectional welding-assistant tube to push the upper melting part of the bidirectional welding-assistant tube to fully contact with the inner wall of the steel tube to form a transverse welding line;
s4, standing and cooling, knocking to remove welding slag, and polishing to finish welding;
the bidirectional welding-assisting pipe comprises a radial soldering terminal (1) and two transverse welding pipes (2) fixedly connected to the left end and the right end of the radial soldering terminal (1) respectively, a powder embedding groove is formed in the outer end of each transverse welding pipe (2), an inner welding powder block (3) is embedded in each powder embedding groove, the outer surface of each transverse welding pipe (2) is wrapped with a protective film, and the protective film and the inner welding powder block (3) are attached to each other;
the transverse welded pipe (2) is of a hollow structure, and high-heat-conductivity gas is filled in the transverse welded pipe (2), and the filling degree of the high-heat-conductivity gas is not lower than 80%; the upper inner wall and the lower inner wall of the transverse welding pipe (2) are both provided with vent top holes (7), the vent top holes (7) are communicated with a hollow part and a powder embedding groove in the transverse welding pipe (2), the bottom end in the powder embedding groove is provided with a metal elastic sheet (8), the edge of the metal elastic sheet (8) is fixedly connected with the powder embedding groove, and other parts of the metal elastic sheet (8) are in contact with the inner bottom end of the powder embedding groove;
the end part of the transverse welding pipe (2) far away from the radial welding piece (1) is provided with a special-shaped hole sealing (6), the middle part of the special-shaped hole sealing (6) is provided with a hollow pre-sealing ball (5), and the aperture of the special-shaped hole sealing (6) facing to the inner opening part is smaller than the aperture of the special-shaped hole sealing (6) facing to the outer opening part; the hollow pre-sealing ball (5) is a hollow stainless steel ball, air with the volume not less than 80% is filled in the hollow pre-sealing ball, and the diameter of the hollow pre-sealing ball (5) is larger than the aperture of the special-shaped hole sealing hole (6) towards the outer opening.
2. The steel pipe embedded type two-way welding process according to claim 1, characterized in that: before the assembly in S2, the protective film on the outer surface of the bidirectional flux tube is firstly torn off.
3. The steel pipe embedded type two-way welding process according to claim 2, characterized in that: and when the S3 is welded, the two steel pipes are respectively extruded towards the positions of the bidirectional welding-assistant pipes.
4. The steel pipe embedded type two-way welding process according to claim 1, characterized in that: the inner welding powder block (3) is formed by pressing metal powder, and the upper surface of the inner welding powder block (3) is flush with the surface of the transverse welding pipe (2).
5. The steel pipe embedded type two-way welding process according to claim 1, characterized in that: the radial welding piece (1) comprises an embedded framework layer (11) and an outer-wrapping welding piece (12) wrapped on the outer surface of the embedded framework layer (11), the outer-wrapping welding piece (12) is wrapped with a coating far away from the surface of the transverse welding pipe (2), and the surface of the coating is in a plurality of raised hemispherical shapes.
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Effective date of registration: 20220518 Address after: 061400 Gaozhai Industrial Zone, Mengcun Hui Autonomous County, Cangzhou City, Hebei Province Applicant after: Hebei Fangquan pipeline equipment Co.,Ltd. Address before: No. 131, Xinjia Road, Haicang District, Xiamen City, Fujian Province, 361000 Applicant before: Qiu Yongmei |
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