CN105414727A - Heat radiating method and tool for pipe welding process - Google Patents
Heat radiating method and tool for pipe welding process Download PDFInfo
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- CN105414727A CN105414727A CN201511012985.0A CN201511012985A CN105414727A CN 105414727 A CN105414727 A CN 105414727A CN 201511012985 A CN201511012985 A CN 201511012985A CN 105414727 A CN105414727 A CN 105414727A
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- conducting film
- heat conducting
- welding process
- guide wall
- tubing
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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
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
- B23K9/323—Combined coupling means, e.g. gas, electricity, water or the like
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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
- B23K37/003—Cooling means
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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a heat radiating method for a pipe welding process, belonging to the technical field of welding and particularly relates to a heat radiating method and tool for a pipe welding process. The invention provides a heat radiating method and tool for the pipe welding process, which is high in welding efficiency and good in heat radiating effect. The heat radiating tool for the pipe welding process comprises an air guide wall arc and a heat conducting film and is structurally characterized in that two sides of a pipe welding joint are wrapped by the heat conducting film; the air guide wall arc is provided with a plurality of air guide nozzles; the outlet direction of each air guide nozzle is inclined towards the heat conducting film far away from the welding joint and is in a central gathering way; and an air inlet is formed in one end of the air guide wall arc.
Description
Technical field
The invention belongs to welding technology field, particularly relate to method and the frock of the heat radiation of a kind of tubing welding process.
Background technology
Because alloy steel products crystallization temperature interval range is comparatively large, in welding process, easily produce crystallization heat crackle.Wherein, the crater crack produced when SMAW receives arc, the weld seam longitudinal crack produced during submerged-arc welding all belongs to fire check.Therefore, strictly must control interlayer temperature in welding process, reduce deposited metal crystallization time, effectively control the probability that fire check occurs.For the thermally sensitive steel such as P91, P92, in order to avoid the generation of fire check, in welding process, must ensure that interlayer temperature is not higher than 300 DEG C; Once very easily there is crackle in overtemperature.But in actual Lincoln weld welding process, very easily there is overheating problem in some minor caliber pipes.Such as, ID432 × 72mm/P91 tubing, adopt Φ 3.2mm welding wire, namely there is overheating problem in continuous welding 30-40 minute, need stop arc 10-15 minute, waits that naturally cooling to less than 300 DEG C welds again; ID349 × 100mm/P92 tubing, adopts Φ 2.4mm welding wire, and welding 50-60 divides, and need stop arc 10-15 minute, wait that naturally cooling to less than 300 DEG C welds again.What this phenomenon was serious have impact on welding efficiency, adds welding point quantity, too increases the probability producing weld defect.
On the other hand, the steel such as P91 belong to air-cooled martensitic steel, have structure sensitive properties, and in postwelding martensite transfor mation, hydrogen residues in martensite with hypersaturated state, impel this region brittle; And this martensitic traoformation, the structural stress of joint is increased, when the larger tubing of Welding Structure rigidity (power pipe all belongs to this type of), very easily forms cold crack.Therefore, adopt traditional water-cooled, the mode such as air-cooled is when lowering the temperature to tubing welding process, the phenomenons such as easy occurrence temperature is too low, quenching, local quenching, all can impel the generation of weld defect.
Document " Developing Application of austenitic stainless steel tubule welding bead heat sink " (" solder technology " the 10th phase the 41st volume in 2012) describes a kind of mode and frock of water-cooled cooling, effectively reduces the substrate temperature in welding process.But the method also exists obvious defect: the water jacket that (1) the method adopts is special tooling, poor universality, the tubing for different size needs the water jacket processing different size; (2) frock need adopt the copper material that thermal conductivity is good, and cost is higher; (3) assembling is complicated, needs the servicing units such as spring and needs to ensure to be close to tube wall; (4) can only obtain and fall effect, be difficult to reach the control to welding temperature, namely need the tubing of preheating to be difficult to be suitable for P91, P92 etc.; (5) be only applicable to the situation that manual welding, all position welding or other welding objects are fixing, be not suitable for the situation that in welding process, tubing rotates.
Summary of the invention
The present invention is exactly for the problems referred to above, provides a kind of welding efficiency is high, the tubing welding process of good heat dissipation effect is dispelled the heat method and frock.
For achieving the above object, the present invention adopts following technical scheme, and the frock of tubing welding process heat radiation of the present invention comprises air guide wall arc and heat conducting film, and its structural feature heat conducting film is wrapped in tubing weld seam both sides; Described air guide wall arc is provided with multiple gas guide nozzle; Each gas guide nozzle Way out tilts towards on the heat conducting film away from described weld seam, in center condensed form; Air guide wall arc one end is provided with air inlet.
As a kind of preferred version, each gas guide nozzle Way out place of the present invention straight line all intersects at the same point on described heat conducting film longitudinal center line.
As another kind of preferred version, air guide wall arc of the present invention is semicircle air guide wall arc.
As another kind of preferred version, air inlet place of the present invention is provided with pressure regulator valve.
As another kind of preferred version, air guide wall arc of the present invention is two, and the heat conducting film of corresponding tubing weld seam both sides is arranged respectively.
As another kind of preferred version, heat conducting film of the present invention is that outer surface covers the graphite film of glue, aluminium foil or Copper Foil.
Secondly, heat conducting film of the present invention is 60 ~ 500mm near the distance of weld seam one end and weld edge, and the length of heat conducting film is more than or equal to 100mm; Described air guide wall arc place plane is axial vertical with heat conducting film, and the axis of each gas guide nozzle Way out and heat conducting film is 20 ~ 70 ° of angles; Described air inlet is connected with 8mm flexible pipe.
In addition, the bottom of air guide wall arc of the present invention is arranged on the upper end of upper and lower telescope support.
The method of tubing welding process heat radiation of the present invention comprises the following steps.
1) heat conducting film is adopted to wrap up weld seam both sides respectively.
2) the air stream described wind-guiding mouth being formed concentrates on heat conducting film longitudinal center line, forms semicircle air flue, and air flow weld seam not dorsad, flow to pipe two ends from weld seam both sides.
3) after welding starts, when interlayer temperature or substrate temperature reach desired value, open described pressure regulator valve, adopt compressed air to carry out air-cooled.
4) regulate compressed air require, make heat input and diffusion reach balance, stablize interlayer temperature or substrate temperature.
As a kind of preferred version, the desired value in step 3) of the present invention refers to below technological requirement maximum temperature 10 ~ 20 DEG C; Described in described step 4), the pressure of compressed air require is 0.15 ~ 0.6MPa.
Beneficial effect of the present invention.
(1) operation and frock is simple, easy, applicability is good, a set of frock can meet the welding demand of multiple different size tubing.
(2) lowering temperature uniform: adopt heat conducting film parcel tubing, utilize the characteristic of its high thermal conductivity coefficient to ensure that heat evenly spreads in radial direction, avoid the local quenching phenomenon that direct cold wind causes, also improve the heat exchanger effectiveness of whole radial direction.
(3) welding heat diffuses to heat conducting film through pipe matrix, is realizing dissipating through heat conducting film and compressed-air actuated heat exchange.
(4) there will not be in whole welding process cause because of overheating problem stop arc, drastically increase welding efficiency, reduce welding cost.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.Scope is not only confined to the statement of following content.
Fig. 1 is structural representation of the present invention.
Fig. 2 is the embodiment of the present invention one welding bead interlayer temperature curve map over time.
Fig. 3 is the embodiment of the present invention two welding bead interlayer temperature curve map over time.
In Fig. 1: 1 be telescoping shoring column, 2 be air inlet, 3 be pressure regulator valve (or flowmeter), 4 be air guide wall arc, 5 be gas guide nozzle, 6 be heat conducting film, 7 be welding bead, 8 for tubing.
Detailed description of the invention
As shown in the figure, the frock of tubing welding process heat radiation of the present invention comprises air guide wall arc and heat conducting film, and heat conducting film is wrapped in tubing weld seam both sides; Described air guide wall arc is provided with multiple gas guide nozzle; Each gas guide nozzle Way out tilts towards on the heat conducting film away from described weld seam, in center condensed form; Air guide wall arc one end is provided with air inlet.
Described each gas guide nozzle Way out place straight line all intersects at the same point on described heat conducting film longitudinal center line.
Described air guide wall arc is semicircle air guide wall arc.
Described air inlet place is provided with pressure regulator valve.By regulating compressed air require effectively can control heat exchange coefficient, be convenient to the control to welding temperature.
Described air guide wall arc is two, and the heat conducting film of corresponding tubing weld seam both sides is arranged respectively.
Described heat conducting film is that outer surface covers the graphite film of glue, aluminium foil or Copper Foil.
Described heat conducting film is 60 ~ 500mm near the distance of weld seam one end and weld edge, and the length of heat conducting film is more than or equal to 100mm.Reserve 60 ~ 500mm distance, facilitate the observing and controlling to matrix and interlayer temperature.
The bottom of described air guide wall arc is arranged on the upper end of upper and lower telescope support.
Described air guide wall arc place plane is axial vertical with heat conducting film, and the axis of each gas guide nozzle Way out and heat conducting film is 20 ~ 70 ° of angles.
Described air inlet is connected with 8mm flexible pipe.
The method of tubing welding process heat radiation of the present invention comprises the following steps.
1) heat conducting film is adopted to wrap up weld seam both sides respectively.
2) the air stream described wind-guiding mouth being formed concentrates on heat conducting film longitudinal center line, forms semicircle air flue, and air flow weld seam not dorsad, flow to pipe two ends from weld seam both sides.
3) after welding starts, when interlayer temperature or substrate temperature reach desired value, open described pressure regulator valve, adopt compressed air to carry out air-cooled.
4) regulate compressed air require, make heat input and diffusion reach balance, stablize interlayer temperature or substrate temperature.
Desired value in described step 3) refers to below technological requirement maximum temperature 10 ~ 20 DEG C.
Described in described step 4), the pressure of compressed air require is 0.15 ~ 0.6MPa.
Embodiment one.
Proof scheme effect is carried out with Φ 356 × 60mm/P91 straight tube-straight tube welding.Welding manner for adopting manual argon arc welding bottoming 12mm, then adopts automatic submerged arc welding to complete filling and capping.Welding technique of submerged arc welding is: adopt Φ 3.2mm welding wire, interlayer temperature 200 ~ 300 DEG C, electric current 370 ~ 430A, voltage 28 ~ 32V, speed 400 ~ 500mm/min.
Under the condition of not carrying out cooling process, automatic submerged-arc welds whole welding process need stop arc 4 times, stops arc at every turn and naturally cools 20min, need 240min to complete welding altogether.The present embodiment only carries out contrast verification to automatic submerged arc welding process.The concrete steps adopting cool-down method to carry out automatic submerged arc welding weldering are.
(1) outer surface that 0.15mm is thick, 150mm is long is adopted to cover glue graphite guide hotting mask parcel welding bead both sides before welding; Parcel scope: between welding bead edge 60 ~ 210mm, wrap up one week.
(2) frock position is ajusted: the compressed air stream of wind-guiding mouth and tubing are axially in 30 ° of angles; Air channel is concentrated with ring-type and is blowed to heat conducting film axial centre position, namely apart from the radial outer wall place of welding bead edge 135mm.
(3) weld according to welding process requirement, after starting automatic submerged arc welding 30min, interlayer temperature reaches 280 DEG C, opens valve and carries out cooling process.
(4) regulate pressure regulator valve, make compressed air remain on 0.3MPa.
(5) start capping after continuing welding 120min, stop cooling.
(5), after only needing 15min, welding terminates.
Whole welding process does not need to stop arc cooling, and between specific layer, temperature variation curve as shown in Figure 2.With do not adopt compared with cool-down method welds, save time 75min, and namely efficiency improves 31.25%.
Embodiment two.
With the difference of embodiment one.
(1) identifying object is Φ 375 × 57mm/P91 straight tube-elbow welding.
(2) the compressed air stream of wind-guiding mouth and tubing axial direction are 45 ° of angles.
(3) outer surface that 0.1mm is thick, 100mm is long is adopted to cover glue aluminium foil parcel welding bead both sides; Parcel scope: between welding bead edge 60 ~ 160mm, wrap up one week.
(4) compressed air remains on 0.6MPa.
(5) after automatic submerged arc welding 40min, interlayer temperature reaches 295 DEG C, opens valve and carries out cooling process;
(6) whole welding process does not need to stop arc cooling, needs 165min altogether, and does not carry out compared with cooling process, and save 60min, efficiency raising about 26.7%, between specific layer, temperature variation curve as shown in Figure 3.
Embodiment three.
With the difference of embodiment one.
(1) identifying object is Φ 432 × 72mm/P91 straight tube-elbow welding.
(2) the compressed air stream of wind-guiding mouth and tubing are axially in 60 ° of angles.
(3) outer surface that 0.1mm is thick, 100mm is long is adopted to cover glue aluminium foil parcel welding bead both sides; Parcel scope: between welding bead edge 60 ~ 160mm, wrap up one week.
(4) compressed air remains on 0.4MPa.
(5) after automatic submerged arc welding 50min, interlayer temperature reaches 295 DEG C, opens valve and carries out cooling process.
(6) whole welding process does not need to stop arc cooling, needs 255min altogether, and does not carry out compared with cooling process, saving 80min, efficiency raising 23.9%.
Embodiment four.
With the difference of embodiment one.
(1) welding technique of submerged arc welding is: adopt Φ 2.4mm welding wire, interlayer temperature 200 ~ 300 DEG C, electric current 320 ~ 350A, voltage 28 ~ 32V, speed 340 ~ 400mm/min.
(2) identifying object is Φ 449 × 100mm/P92 straight tube-straight tube welding.
(3) the compressed air stream of wind-guiding mouth and tubing axial direction are 50 ° of angles.
(4) outer surface that 0.15mm is thick, 300mm is long is adopted to cover glue graphite film parcel welding bead both sides; Parcel scope: between welding bead edge 60 ~ 360mm, wrap up one week.
(5) compressed air remains on 0.2MPa.
(6) after automatic submerged arc welding 60min, interlayer temperature reaches 270 DEG C, opens valve and carries out cooling process.
(7) whole welding process does not need to stop arc cooling, needs 600min altogether, and does not carry out compared with cooling process, saving 90min, efficiency raising 13.04%.
Be understandable that, above about specific descriptions of the present invention, the technical scheme described by the embodiment of the present invention is only not limited to for illustration of the present invention, those of ordinary skill in the art is to be understood that, still can modify to the present invention or equivalent replacement, to reach identical technique effect; Needs are used, all within protection scope of the present invention as long as meet.
Claims (10)
1. a frock for tubing welding process heat radiation, comprises air guide wall arc and heat conducting film, it is characterized in that heat conducting film is wrapped in tubing weld seam both sides; Described air guide wall arc is provided with multiple gas guide nozzle; Each gas guide nozzle Way out tilts towards on the heat conducting film away from described weld seam, in center condensed form; Air guide wall arc one end is provided with air inlet.
2. the frock of a kind of tubing welding process heat radiation according to claim 1, is characterized in that described each gas guide nozzle Way out place straight line all intersects at the same point on described heat conducting film longitudinal center line.
3. the frock of a kind of tubing welding process heat radiation according to claim 1, is characterized in that described air guide wall arc is semicircle air guide wall arc.
4. the frock of a kind of tubing welding process heat radiation according to claim 1, is characterized in that described air inlet place is provided with pressure regulator valve.
5. the frock of a kind of tubing welding process heat radiation according to claim 1, is characterized in that described air guide wall arc is two, and the heat conducting film of corresponding tubing weld seam both sides is arranged respectively.
6. the frock of a kind of tubing welding process heat radiation according to claim 1, is characterized in that described heat conducting film is that outer surface covers the graphite film of glue, aluminium foil or Copper Foil.
7. the frock of a kind of tubing welding process heat radiation according to claim 1, it is characterized in that described heat conducting film is 60 ~ 500mm near the distance of weld seam one end and weld edge, the length of heat conducting film is more than or equal to 100mm; Described air guide wall arc place plane is axial vertical with heat conducting film, and the axis of each gas guide nozzle Way out and heat conducting film is 20 ~ 70 ° of angles; Described air inlet is connected with 8mm flexible pipe.
8. the frock of a kind of tubing welding process heat radiation according to claim 1, is characterized in that the bottom of described air guide wall arc is arranged on the upper end of upper and lower telescope support.
9. a method for tubing welding process heat radiation, is characterized in that comprising the following steps:
1) heat conducting film is adopted to wrap up weld seam both sides respectively;
2) the air stream described wind-guiding mouth being formed concentrates on heat conducting film longitudinal center line, forms semicircle air flue, and air flow weld seam not dorsad, flow to pipe two ends from weld seam both sides;
3) after welding starts, when interlayer temperature or substrate temperature reach desired value, open described pressure regulator valve, adopt compressed air to carry out air-cooled;
4) regulate compressed air require, make heat input and diffusion reach balance, stablize interlayer temperature or substrate temperature.
10. the method for a kind of tubing welding process heat radiation according to claim 9, is characterized in that the desired value in described step 3) refers to below technological requirement maximum temperature 10 ~ 20 DEG C; Described in described step 4), the pressure of compressed air require is 0.15 ~ 0.6MPa.
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| CN201511012985.0A CN105414727B (en) | 2015-12-31 | 2015-12-31 | A kind of method and frock of the radiating of tubing welding process |
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| CN201511012985.0A CN105414727B (en) | 2015-12-31 | 2015-12-31 | A kind of method and frock of the radiating of tubing welding process |
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| CN105414727B CN105414727B (en) | 2018-02-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112496623A (en) * | 2019-12-17 | 2021-03-16 | 陶志东 | Tool for welding rigid structural member with self-adaptive compensation of thermal stress |
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| JP2010029931A (en) * | 2008-07-31 | 2010-02-12 | Jfe Steel Corp | Multi-electrode submerged arc welding method |
| CN201471099U (en) * | 2009-08-24 | 2010-05-19 | 中国石化集团第十建设公司 | Welding protective cover for titanium pipeline of argon-shielded tungsten arc welding gun |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112496623A (en) * | 2019-12-17 | 2021-03-16 | 陶志东 | Tool for welding rigid structural member with self-adaptive compensation of thermal stress |
| CN112496624A (en) * | 2019-12-17 | 2021-03-16 | 陶志东 | Tool for welding rigid structural part with self-adaptive compensation of thermal stress |
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| CN105414727B (en) | 2018-02-16 |
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