CN219026265U - Metal pipe fitting girth weld back oxidation protection device - Google Patents
Metal pipe fitting girth weld back oxidation protection device Download PDFInfo
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- CN219026265U CN219026265U CN202223370564.3U CN202223370564U CN219026265U CN 219026265 U CN219026265 U CN 219026265U CN 202223370564 U CN202223370564 U CN 202223370564U CN 219026265 U CN219026265 U CN 219026265U
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Abstract
The utility model provides a metal pipe fitting girth back oxidation protection device, including first apron, the second apron, the inlet port, the venthole, its characterized in that has a screw rod to pass first apron, the second apron centre bore respectively in addition, and it is fixed to cover the nut on the screw rod in the second apron outside, thereby the support body that supplies the pipe fitting to wait to weld fixed has been constituteed, open in the upper portion outside of second apron has the inlet port, external connection intake pipe, open in the lower part outside of second apron has the venthole, it can carry out effective oxidation protection to pipe fitting girth back of titanium alloy, stainless steel, superalloy etc. material, can guarantee the axiality requirement after the pipe fitting butt welding as anti-weld deformation frock simultaneously, and simple structure quick detachable, with low costs.
Description
Technical Field
The utility model relates to the technical field of welding, in particular to an anti-oxidation protection device for the back surface of a circumferential weld of a metal pipe fitting.
Background
Welding is widely used in the automotive industry, the marine industry and the aviation industry as a technique for connecting intermetallic and non-intermetallic materials.
The titanium alloy, the high-strength stainless steel, the high-temperature alloy and other materials have the advantages of high strength, good corrosion resistance, excellent high-temperature performance and the like, and are widely applied to the fields of aerospace, ocean engineering, petrochemical industry, nuclear industry and the like. The metal pipe fitting is one of the most commonly used structural profiles, the problem of connection between pipes can be involved in the engineering application process, in order to ensure the rigidity and strength of the assembly, lighten the structural weight and achieve the sealing effect, a fusion welding method (laser welding, TIG welding, MIG welding and the like) is generally adopted to realize connection, and due to the material characteristics of strong chemical activity of titanium alloy, stainless steel and high-temperature alloy, high-concentration oxygen is easy to dissolve into the alloy surface to form an oxygen-enriched layer in the high-temperature welding process, so that the welding seam is oxidized, the plasticity and toughness of the welding seam are greatly reduced, and the service safety and the service life are influenced.
Therefore, when the metal pipe fitting with the material is subjected to fusion welding in a non-vacuum environment, the front surface of the welding seam is required to be subjected to oxidation protection, the back surface of the welding seam is required to be subjected to oxidation protection, and the method for protecting the welding seam by designing and manufacturing the protecting device and forming an anaerobic environment around the welding seam by inert gas is the most commonly used oxidation protection method for the welding seam at present. However, in the engineering practice process, the design and manufacture of the metal pipe fitting butt-joint girth weld back surface oxidation prevention protection device need to consider the following factors at the same time: (1) oxidation prevention protection effect: the protection device has good anti-oxidation protection effect; (2) whether the welding deformation control requirement is satisfied or not: after butt welding of the circumferential seams of the metal pipe fitting, the requirement on higher coaxiality is generally met, and the problem of welding deformation control is considered at the same time when the protective device is applied, so that the anti-oxidation protective device can be used as an anti-deformation tool or does not influence the application and the detachment of the anti-welding deformation tool; (3) removability: the protection device has simple structure, reasonable design, detachable after welding and convenient use.
Through investigation, patent number CN201811487526.1 provides a gas protection device and method for cabin girth welding, the device comprises: a front protection device and/or a back protection device; the front protection device includes: tail protection drag cover; the gas pipe is used for leading the protective gas to be connected into the gas pipe through the gas pipe, and after certain pressure distribution is formed in the gas pipe, the gas pipe is acted on the high-temperature part on the front surface of the molten pool and the welding line; the back protection device includes: a sealing device; the sealing device is used for sealing two ends of the cabin; the air inlet hole is used for leading the protective gas into the cabin body, and the air outlet hole is used for leading the air in the cabin body to be discharged. The method comprises the following steps: introducing protective gas into the cabin body to protect the back surface of the circular seam; and (3) introducing protective gas into the tail protective towing cover to protect the front surface of the circular seam. According to the utility model, the front and/or back of the circular seam is protected, the reaction of alloy and other components in the air in the welding process is avoided, the embrittlement of the welded joint structure and the deterioration of the mechanical property are avoided, and the device is not provided with a fixing device for fixing the part waiting to be welded, so that the device needs to additionally fix the fixing device for the part to be welded or can generate welding deformation when in use.
Disclosure of Invention
The technical problem to be solved mainly by the utility model is to provide the anti-oxidation protection device for the back surface of the circumferential weld of the metal pipe fitting, which can effectively prevent oxidation protection for the back surface of the circumferential weld of the pipe fitting made of titanium alloy, stainless steel, high-temperature alloy and other materials, and can be used as an anti-welding deformation tool to ensure the coaxiality requirement of the pipe fitting after butt welding.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a metal pipe fitting girth welding seam back oxidation protection device, includes first apron, second apron, inlet port, venthole, and its characterized in that has a screw rod in addition to pass first apron, second apron centre bore respectively to the cover has flat washer, spring washer and nut to fix on the screw rod in the second apron outside, thereby has formed the supporter that supplies to wait to weld the pipe fitting to fix, and open in the upper portion outside of second apron has the inlet port, and external connection intake pipe, open in the second apron low part outside has the venthole.
As a further aspect of the utility model: a circular boss for sleeving the port of the pipe to be welded is arranged on the inner side of the first cover plate, a central hole is formed in the middle of the circular boss and is matched with the size of the screw rod, and the diameter of the boss is equal to that of the circular boss
Height h of boss T (i.e., the portion embedded in the pipe to be welded) is 15 to 25mm, the diameter of the center hole is +.>
Wherein d is T Is the diameter of the boss of the cover plate, d G For the inner diameter of the pipe fitting to be welded, d K D is the diameter of the central hole of the cover plate L Is the screw diameter.
As a further aspect of the utility model: the inner side of the second cover plate is provided with a circular boss for sleeving a port of a pipe fitting to be welded, and the length of the circular boss of the second cover plate is consistent with that of the circular boss of the first cover plate.
As a further aspect of the utility model: the diameter dL of the screw is 25-35 mm, the diameter tolerance is-0.02/-0.04 mm, and the length of the screw can be adjusted according to the length of the pipe to be welded.
As a further aspect of the utility model: the diameters of the first cover plate and the second cover plate are the same as the outer diameter of the pipe fitting to be welded, and the thickness (excluding the boss) b of the first cover plate 1 50-60 mm, a second cover plate thickness (excluding boss) b 2 Is 10-20 mm.
As a further aspect of the utility model: diameter of air inlet D J 8-10 mm.
Preferably the diameter D of the air outlet hole C 70-80% of the diameter of the air inlet hole.
And finally, a flat washer and a spring washer are sleeved on the screw rod between the outer side of the second cover plate and the nut for fixing.
Compared with the prior art, the utility model has the advantages that:
(1) According to the utility model, the cover plate and the pipe to be welded form the chamber, the air inlet and the air outlet are arranged on the cover plate, and an oxygen-free environment filled with inert gas is formed in the chamber, so that the back surface of the welding seam can be effectively protected from oxidation, and the welding quality is ensured.
(2) The anti-oxidation protection device can be used as an assembly and positioning clamp, ensures the butt joint assembly precision of the pipe to be welded, does not need to carry out positioning welding, can directly weld after assembly and positioning, avoids the influence of positioning welding spots on the quality and consistency of welding joints, and improves the welding efficiency.
(3) The anti-oxidation protection device can also be used as an anti-welding deformation tool, plays a role in controlling welding deformation through the shape, position and size tolerance fit among the cover plate, the screw and the pipe to be welded, and ensures the high coaxiality requirement of the pipe to be welded after welding.
(4) The utility model has reasonable and simple structure, easy manufacture, convenient use and detachable after welding, and can be used for welding the pipe fittings to be welded with different diameters and different lengths according to the actual size of the workpiece.
Drawings
Figure 1 is a schematic view of a structure for fixing a welded pipe fitting according to an embodiment of the present utility model,
figure 2 is a schematic diagram of an embodiment of the present utility model,
in the figure, 1, a first cover plate, 2, a screw rod, 3, a second cover plate, 4, a flat washer, 5, a spring washer, 6, a hexagonal nut, 7, a pipe piece to be welded, 11, a first cover plate central hole, 12, a first cover plate circular boss, 31, an air inlet hole, 32, an air outlet hole, 33, a second cover plate central hole, 34 and a second cover plate circular boss
Detailed Description
Embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the present utility model but are not intended to limit the scope of the present utility model. In the description of the present patent, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as references to orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate the description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present patent, it should be noted that, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the present patent will be understood by those skilled in the art in specific cases.
The utility model is described in further detail below with reference to the embodiments of the drawings.
According to fig. 1-2, an oxidation-proof protection device for the back of the circumferential weld of a metal pipe fitting comprises a first cover plate 1, a second cover plate 3, an air inlet hole 31 and an air outlet hole 32, wherein the key of the utility model is that a screw rod 2 respectively passes through a first cover plate central hole 11 and a second cover plate central hole 33, and a flat washer 4 and a spring are sleeved on the screw rod 2 outside the second cover plate 3The washer 5 and the nut 6 are fixed, so that a support body for fixing the pipe fitting 7 to be welded is formed, an air inlet hole 31 is formed in the outer side of the upper portion of the second cover plate 3, an air inlet pipe is connected to the outside, and an air outlet hole 32 is formed in the outer side of the lower portion of the second cover plate 3. A first cover plate circular boss 12 for sleeving the port of the pipe 7 to be welded is arranged on the inner side of the first cover plate 1, a first cover plate central hole 11 is formed in the middle of the first cover plate circular boss 12 and is matched with the size of the screw rod 2, and the diameter of the boss is equal to that of the screw rod 2
Height h of boss T (i.e., the portion embedded in the pipe to be welded) is 15 to 25mm, the diameter of the center hole is +.>
Wherein d is T Is the diameter of the boss of the cover plate, d G For the inner diameter of the pipe fitting to be welded, d K D is the diameter of the central hole of the cover plate L Is the diameter of the screw 2. The inner side of the second cover plate 3 is provided with a second cover plate circular boss 34 for sleeving a pipe fitting port to be welded, and the length of the second cover plate circular boss 34 is consistent with that of the first cover plate circular boss 12. Screw diameter d L The diameter tolerance is-0.02/-0.04 mm, and the length of the screw 2 can be adjusted according to the length of the pipe piece 7 to be welded. The diameters of the first cover plate 1 and the second cover plate 3 are the same as the outer diameter of the pipe piece to be welded, and the thickness (excluding the boss) b of the first cover plate 1 1 50-60 mm, the thickness (excluding the boss) b of the second cover plate 3 2 Is 10-20 mm. In addition, the diameter DJ of the air inlet hole is 8-10 mm, and the diameter D of the air outlet hole C 70-80% of the diameter of the air inlet hole.
The circumferential seam welding of tubular members to be welded using the oxidation preventing device of the present utility model will be described in further detail with reference to examples.
Application example 1
Taking the laser welding of a butt joint circular seam of a TC4 titanium alloy pipe fitting with the specification of phi 242 multiplied by 8mm as an example, with reference to fig. 1 and 2, when the oxidation prevention protection device is used for welding, the following steps are carried out: the first cover plate 1 and the second cover plate 3 are respectively arranged at the non-welding end of the pipe fitting 7 to be welded; the screw rod 2 sequentially passes through the first cover plate central hole 11 and the second cover plate central hole 33, the flat washer 4, the spring washer 5 and the hexagonal nut 6 are sequentially assembled at the extending section of the screw rod 2 and the second cover plate 3, the nut 6 is screwed by a spanner, the first cover plate circular boss 12 and the second cover plate circular boss 34 are ensured to clamp the pipe fitting 7 to be welded, and therefore the assembly precision of the pipe fitting 7 to be welded is ensured; mounting the clamping end of the first cover plate 1 on a positioner chuck; connecting an argon-filled air pipe with an air inlet hole 31; starting a position changing machine, starting an argon switch, introducing argon into a cavity formed by the pipe fitting 7 to be welded, the first cover plate 1 and the second cover plate 3, and performing girth welding on the pipe fitting 7 to be welded after 30-180 seconds of exhausting air in the cavity; argon is kept continuously introduced in the welding process, and the argon is introduced for 60-120 s after the welding is finished, so that the oxidation prevention protection effect of the back surface of the welding seam of the pipe 7 to be welded is ensured; closing the position changing machine, and taking down the welded TC4 titanium alloy pipe fitting and the anti-oxidation protection device from the position changing machine; and disassembling the anti-oxidation protection device and cleaning the operation site.
Application example 2
Referring to fig. 1 and 2, taking argon arc welding of a 15-5PH stainless steel pipe fitting butt joint girth with the specification of Φ160×3mm as an example, when the anti-oxidation protection device is used for welding, the operation is carried out according to the following steps: the first cover plate 1 and the second cover plate 3 are respectively arranged at the non-welding end of the pipe fitting 7 to be welded; the screw rod 2 sequentially penetrates through the central holes of the first cover plate 1 and the second cover plate 3, the flat gasket 4, the spring gasket 5 and the hexagonal nut 6 are sequentially assembled at the extending section of the screw rod 2 and the second cover plate 3, the nut 6 is screwed by a spanner, the first cover plate circular boss 12 and the second cover plate circular boss 34 are ensured to clamp the pipe fitting 7 to be welded, and therefore the assembly precision of the pipe fitting 7 to be welded is ensured; mounting the clamping end of the first cover plate 1 on a positioner chuck; connecting an argon-filled air pipe with an air inlet hole 31; starting a position changing machine, starting an argon switch, introducing argon into a cavity formed by the to-be-welded pipe fitting 7, the first cover plate 1 and the second cover plate 3, and performing girth welding on the to-be-welded pipe fitting after 30-180 seconds of exhausting air in the cavity; argon is kept continuously introduced in the welding process, and the argon is introduced for 60-120 s after the welding is finished, so that the oxidation prevention protection effect of the back surface of the welding seam of the pipe 7 to be welded is ensured; closing the position changing machine, and taking the welded 15-5PH stainless steel pipe and the oxidation preventing protection device off the position changing machine; and disassembling the anti-oxidation protection device and cleaning the operation site.
Application example 3
Referring to fig. 1 and 2, taking argon arc welding of a butt joint circular seam of a GH4169 high-temperature alloy pipe fitting with the specification of phi 182×5mm as an example, when the oxidation prevention protection device is used for welding, the following steps are performed: the first cover plate 1 and the second cover plate 3 are respectively arranged at the non-welding end of the pipe fitting 7 to be welded; the screw rod 2 sequentially penetrates through the central holes of the first cover plate 1 and the second cover plate 3, the flat gasket 4, the spring gasket 5 and the hexagonal nut 6 are sequentially assembled at the extending section of the screw rod 2 and the second cover plate 3, the nut 6 is screwed by a spanner, the first cover plate circular boss 12 and the second cover plate circular boss 34 are ensured to clamp the pipe fitting 7 to be welded, and therefore the assembly precision of the pipe fitting 7 to be welded is ensured; mounting the clamping end of the first cover plate 1 on a positioner chuck; connecting an argon-filled air pipe with an air inlet hole 31; starting a position changing machine, starting an argon switch, introducing argon into a cavity formed by the to-be-welded pipe fitting 7, the first cover plate 1 and the second cover plate 3, and performing girth welding on the to-be-welded pipe fitting after 30-180 seconds of exhausting air in the cavity; argon is kept continuously introduced in the welding process, and the argon is introduced for 60-120 s after the welding is finished, so that the oxidation prevention protection effect of the back surface of the welding seam of the pipe 7 to be welded is ensured; closing the position changing machine, and taking down the welded GH4169 high-temperature alloy pipe fitting and the oxidation preventing protection device from the position changing machine; and disassembling the anti-oxidation protection device and cleaning the operation site.
The anti-oxidation protection device provided by the utility model can be used for welding circumferential welds of pipe fittings to be welded of titanium alloy, stainless steel, high-temperature alloy and other materials, and can play a good role in anti-oxidation protection of the back surface of the welds. The special detection shows that the back of the welding line is not seriously oxidized, the back of the welding line is silvery white or discontinuous faint yellow, the welding quality of the circumferential welding line of the pipe fitting to be welded is guaranteed, and meanwhile, the welding line has high coaxiality, and the welding line is simple in structure, easy to detach and install, reusable and low in cost.
Claims (8)
1. The utility model provides a metal pipe fitting girth welding seam back oxidation protection device, includes first apron, second apron, inlet port, venthole, and its characterized in that has a screw rod in addition to pass first apron, second apron centre bore respectively to the cover has the nut to fix on the screw rod in the second apron outside, thereby has formed the supporter that supplies to wait to weld the pipe fitting to fix, and open in the upper portion outside of second apron has the inlet port, and external connection intake pipe, open in the second apron low part outside has the venthole.
2. The oxidation protection device for the back of a circumferential weld of a metal pipe fitting according to claim 1, wherein a circular boss for a port of the pipe fitting to be welded to be sleeved is arranged on the inner side of the first cover plate, a central hole is formed in the middle of the circular boss of the first cover plate and is matched with the size of a screw rod, and the diameter of the boss is equal to that of the circular boss
Height h of boss T I.e. the part embedded in the pipe piece to be welded is 15-25 mm, the diameter of the central hole is +.>
Wherein d is T Is the diameter of the boss of the cover plate, d G For the inner diameter of the pipe fitting to be welded, d K D is the diameter of the central hole of the cover plate L Is the screw diameter.
3. The oxidation protection device for the back of the circumferential weld of the metal pipe fitting according to claim 1, wherein a circular boss for sleeving a port of the pipe fitting to be welded is arranged on the inner side of the second cover plate, and the length of the circular boss of the second cover plate is consistent with that of the circular boss of the first cover plate.
4. The oxidation-preventing protecting device for the back of a circumferential weld of a metal pipe fitting according to claim 1, wherein the screw diameter d L The diameter tolerance is-0.02/-0.04 mm, and the length of the screw can be adjusted according to the length of the pipe to be welded.
5. The oxidation protection device for the back of a girth weld of a metal pipe fitting according to claim 1, whereinThe diameters of the first cover plate and the second cover plate are the same as the outer diameter of the pipe fitting to be welded, and the thickness of the first cover plate does not comprise a boss b 1 50-60 mm, the thickness of the second cover plate does not comprise a boss b 2 Is 10-20 mm.
6. The oxidation-preventing protecting device for the back of a circumferential weld of a metal pipe fitting according to claim 1, wherein the diameter D of the air inlet hole J 8-10 mm.
7. The oxidation protection device for the back of a circumferential weld of a metal pipe fitting according to claim 1, wherein the diameter D of the gas outlet hole C 70-80% of the diameter of the air inlet hole.
8. The oxidation protection device for the back of the circumferential weld of the metal pipe fitting according to claim 1 is characterized in that a flat washer and a spring washer are sleeved on the screw rod between the outer side of the second cover plate and the nut for fixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223370564.3U CN219026265U (en) | 2022-12-15 | 2022-12-15 | Metal pipe fitting girth weld back oxidation protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223370564.3U CN219026265U (en) | 2022-12-15 | 2022-12-15 | Metal pipe fitting girth weld back oxidation protection device |
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| Publication Number | Publication Date |
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| CN219026265U true CN219026265U (en) | 2023-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223370564.3U Active CN219026265U (en) | 2022-12-15 | 2022-12-15 | Metal pipe fitting girth weld back oxidation protection device |
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| CN (1) | CN219026265U (en) |
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- 2022-12-15 CN CN202223370564.3U patent/CN219026265U/en active Active
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