CN105834652A - Plate pair laser welding fixing and gas protection tool - Google Patents
Plate pair laser welding fixing and gas protection tool Download PDFInfo
- Publication number
- CN105834652A CN105834652A CN201610369342.XA CN201610369342A CN105834652A CN 105834652 A CN105834652 A CN 105834652A CN 201610369342 A CN201610369342 A CN 201610369342A CN 105834652 A CN105834652 A CN 105834652A
- Authority
- CN
- China
- Prior art keywords
- plate
- welded
- fixed
- laser welding
- gas shield
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000003466 welding Methods 0.000 title claims abstract description 34
- 238000003825 pressing Methods 0.000 claims abstract description 31
- 230000001681 protective effect Effects 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 23
- 238000000034 method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000005493 welding type Methods 0.000 description 1
Classifications
-
- 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 for a procedure covered by only one of the other main groups of this subclass
- B23K37/04—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work
- B23K37/0408—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work for planar work
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/14—Heat exchangers
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Laser Beam Processing (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a plate pair laser welding fixing and gas protection tool. The plate pair laser welding fixing and gas protection tool comprises a fixing plate and a pressing plate arranged on the fixing plate; the shape of the pressing plate is matched with the shape of a heat exchange area of a plate pair to be welded; an upper positioning plate is installed on the inner surface of the pressing plate; a lower positioning plate is installed on the inner surface of the fixing plate; the plate pair to be welded is clamped and fixed between the upper positioning plate and the lower positioning plate; the upper positioning plate is matched with the upper plate sheet to be welded in corrugation and plate type; the lower positioning plate is matched with the lower plate sheet to be welded in corrugation and plate type; and a gas protection groove is formed in the back face of the fixing plate along the edge of a wing plate of the plate pair to be welded and provided with a plurality of air inlets communicating with an air inlet pipe. By installation of the upper positioning plate sheet and the lower positioning plate sheet which are matched with the plate pair to be welded in corrugation and plate type, clamping and firm fixation of the plate sheets of the plate pair to be welded are achieved; protective gas is introduced during welding, and gas protection for the back face of a weld joint is achieved effectively.
Description
Technical field
The present invention relates to heat transmission equipment processing technique field, laser welding is fixed and gas shield frock by a kind of plate, fixes to clamp and back of weld gas shield when Laser Welding welding heat exchanger plate pair.
Background technology
Whole heat exchange plates are linked up by welded plate heat exchanger by Type of Welding, instead of the rubber sheet gasket of removable series of heat exchanger, it is therefore prevented that at high temperature pad deformation failure and cause the problems such as dielectric leakage.Therefore, welding procedure in welded plate heat exchanger manufacture be emphasis be also difficult point.At present, plate mainly uses seam weld to the welding of wing limit.For cost-effective, improving heat exchange efficiency, the sheet of heat exchanger is more and more thinner, and less than 1mm, some model heat exchange plate wing hem width degree are only about 10mm, uses seam weld on the one hand its weld seam poor corrosion resistance, is difficult to meet the requirement of petrochemical iy produced；On the other hand, at plate to weld zone, wing limit, there is straight line and arc transition section, seam weld is difficulty with its sequential welding, and the mode using seam weld and argon arc welding to combine, substantial amounts of man-hour can be spent again.
It is little that Laser Welding has heat input, and heat affected area is little, and workpiece contraction distortion is little, and weld strength is high and weld seam easily realizes the advantages such as automation, is used widely in terms of plate sheet welding.On the one hand the production using Laser Welding welding thin plate pair there is problems in that when welded plate is to wing limit, owing to temperature is too high and easily deform and open；On the other hand according to laser welding platform requirement; plate wing hem width degree (minimum widith after die mould) is 14mm; and due to some heat exchange production boards to wing limit less than 10mm; it is difficult to the butt welded seam back side at former jig and implements effectively protection; the back side of weld seam easily aoxidizes, the welding point that difficult acquisition is excellent.When welded plate is to wing limit, plate to fix and back of weld protection be the problem needing solution badly.
Summary of the invention
It is an object of the invention to provide a kind of plate laser welding to be fixed and gas shield frock, be susceptible to deformation during to solve and to utilize Laser Welding welded plate to wing plate and open, the problem that the jig butt welded seam back side is difficult to carry out effectively protection.
For solving the problems referred to above, the technical solution used in the present invention is:
Laser welding is fixed and gas shield frock by a kind of plate, it includes fixed plate, pressing plate, pressing plate is placed in fixed plate, the shape of pressing plate is suitable with the shape of the heat transfer zone of fishplate bar pair to be welded, the inner surface of pressing plate is provided with location-plate, the inner surface of fixed plate is provided with lower location-plate, between upper location-plate and lower location-plate, geometrical clamp is equipped with fishplate bar pair to be welded, upper location-plate and the ripple of upper sheet space to be welded, template is suitable, lower location-plate and the ripple of lower sheet space to be welded, template is suitable, the back side of fixed plate is provided with gas shield groove along the wing plate edge of fishplate bar pair to be welded, gas shield groove is provided with several air admission holes, air admission hole is connected with air inlet pipe.
As a further improvement on the present invention, being provided with locating piece by two sides of described lower location-plate, locating piece is plugged in fixed plate.
As the further improvement of the present invention, the wing plate periphery of described fishplate bar pair to be welded is provided with several compressing tablet being movably connected in fixed plate by bolt.
As the further improvement of the present invention, described gas shield groove width 2-5mm, deep 9-11mm, by each air admission hole, intake valve is installed.
As the further improvement of the present invention, the upper seamed edge of described platen edge forms limit, slope through chamfered.
As the further improvement of the present invention, the upper surface of described pressing plate is provided with drop handle.
Lower sheet space to be welded in use, is first placed on the lower location plate of fixed plate inner surface by the present invention, owing to lower sheet space to be welded and lower location plate ripple, template are suitable, is coordinated fixed for lower sheet space to be welded by ripple therebetween；Again upper sheet space to be welded is placed on lower sheet space to be welded, the wing limit of two plates fits, locating piece is plugged in fixed plate by the dual-side of plate to be welded, make two plate alignment, again pressing plate is placed on upper sheet space to be welded, owing to upper location plate and the ripple of upper sheet space to be welded, the template of pressing plate inner surface are suitable so that what pressing plate was firm is fastened on upper sheet space to be welded, and two plates are compressed by the deadweight of pressured plate；Recycle the bolt in fixed plate and compressing tablet by plate to wing limit secondary compression, prevent plate in welding process to be heated and open.
The present invention by fishplate bar to be welded to clamp firm after, then place this invention on jig, adjust welding torch position, open the intake valve on gas shield groove, after air inlet pipe is passed through protective gas 10s, then treat welding plate to carrying out Laser Welding weld job.
After weld job completes, first close intake valve, the plate take off pressing plate the most successively, having welded to and fixed plate.
The invention have the benefit that
(1) present invention is by being provided with the upper and lower location plate suitable with the ripple of fishplate bar pair to be welded, template, by fishplate bar to be welded to being fixed respectively, by locating piece, plate is alignd again, by the weight of pressing plate self, the wing plate of plate to be welded is adjacent to, it is achieved that the clamping of the plate of fishplate bar pair to be welded, firm fixing；
(2) present invention is provided with gas shield groove in the back side close adhesion plate of fixed plate to the position at wing plate edge, is passed through protective gas when welding, have effectively achieved the gas shield at the butt welded seam back side, it is possible to obtain excellent welding point；
(3) present invention is provided with several compressing tablet at fishplate bar to be welded to wing plate periphery, wing plate is carried out secondary and fixes, to prevent from typically deforming when high-temperature soldering opening；
(4) shape of center platen of the present invention is suitable with the shape of the heat transfer zone of fishplate bar pair to be welded, and the upper seamed edge of platen edge is formed limit, slope through chamfered, the wing plate of fishplate bar pair to be welded is fully exposed, it is ensured that plate provides sufficient welding space for Laser Welding while compacted.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the side view of the present invention in Fig. 1；
Fig. 3 is the A-A sectional view of the present invention in Fig. 1；
Fig. 4 is the partial enlarged drawing of the present invention in Fig. 3；
Fig. 5 is the perspective view of the present invention；
In figure: 1, fixed plate, 2, pressing plate, 3, air inlet pipe, 4, upper location plate, 5, upper sheet space to be welded, 6, lower sheet space to be welded, 7, bolt, 8, compressing tablet, 9, gas shield groove, 10, lower location plate, 11, intake valve, 12, locating piece.
Detailed description of the invention
The present invention is further detailed explanation below in conjunction with the accompanying drawings.
Laser welding is fixed and gas shield frock by a kind of plate as shown in Figures 1 to 5; it includes fixed plate 1, pressing plate 2; pressing plate 2 is placed in fixed plate 1, and the shape of pressing plate 2 is suitable with the shape of the heat transfer zone of fishplate bar pair to be welded, and the upper seamed edge at pressing plate 2 edge forms limit, slope through chamfered.The inner surface of pressing plate 2 is provided with location-plate 4, the inner surface of fixed plate 1 is provided with lower location-plate 10, between upper location-plate 4 and lower location-plate 10, geometrical clamp is equipped with fishplate bar pair to be welded, upper location-plate 4 and the ripple of upper sheet space 5 to be welded, template are suitable, lower location-plate 10 and the ripple of lower sheet space 6 to be welded, template are suitable, it is provided with locating piece 12 by two sides of lower location-plate 10, locating piece 12 is plugged in fixed plate 1, and the wing plate periphery of fishplate bar pair to be welded is provided with several compressing tablet 8 being movably connected in fixed plate 1 by bolt 7；The back side of fixed plate 1 is provided with gas shield groove 9 along the wing plate edge of fishplate bar pair to be welded, and gas shield groove 9 is provided with several air admission holes, and air admission hole is connected with air inlet pipe 3.
Gas shield groove 9 wide 2-5mm, deep 9-11mm, be provided with intake valve 11 by each air admission hole.
The upper surface of pressing plate 2 is provided with drop handle.
The present invention is in use, first lower sheet space 6 to be welded is placed on the lower location plate 10 of fixed plate 1 inner surface, owing to lower sheet space 6 to be welded and lower location plate 10 ripple, template are suitable, coordinated fixed for lower sheet space 6 to be welded by ripple therebetween；Again upper sheet space 5 to be welded is placed on lower sheet space 6 to be welded, the wing limit of two plates fits, locating piece 12 is plugged in fixed plate 1 by the dual-side of plate to be welded, make two plate alignment, again pressing plate 2 is placed on upper sheet space 5 to be welded, owing to upper location plate 4 and the ripple of upper sheet space 5 to be welded, the template of pressing plate 2 inner surface are suitable so that what pressing plate 2 was firm is fastened on upper sheet space 5 to be welded, and two plates are compressed by the deadweight of pressured plate 2；Recycle the bolt 7 in fixed plate 1 and compressing tablet 8 by plate to wing limit secondary compression, prevent plate in welding process to be heated and open.
The present invention by fishplate bar to be welded to clamp firm after, then place this invention on jig, adjust welding torch position, open the intake valve 11 on gas shield groove 9, after air inlet pipe 3 is passed through protective gas 10s, then treat welding plate to carrying out Laser Welding weld job.
After weld job completes, first close intake valve 11, the plate take off pressing plate 2 the most successively, having welded to and fixed plate 1.
The present invention is by being provided with the upper and lower location plate suitable with the ripple of fishplate bar pair to be welded, template, by fishplate bar to be welded to being fixed respectively, by locating piece, plate is alignd again, by the weight of pressing plate self, the wing plate of plate to be welded is adjacent to, it is achieved that the clamping of the plate of fishplate bar pair to be welded, firm fixing；The present invention is provided with gas shield groove in the back side close adhesion plate of fixed plate to the position at wing plate edge, is passed through protective gas when welding, have effectively achieved the gas shield at the butt welded seam back side, it is possible to obtain excellent welding point.
Claims (6)
- null1. laser welding is fixed and gas shield frock by a plate，It is characterized in that: it includes fixed plate (1)、Pressing plate (2)，Pressing plate (2) is placed in fixed plate (1)，The shape of pressing plate (2) is suitable with the shape of the heat transfer zone of fishplate bar pair to be welded，The inner surface of pressing plate (2) is provided with location-plate (4)，The inner surface of fixed plate (1) is provided with lower location-plate (10)，Between upper location-plate (4) and lower location-plate (10), geometrical clamp is equipped with fishplate bar pair to be welded，Upper location-plate (4) and the ripple of upper sheet space to be welded (5)、Template is suitable，Lower location-plate (10) and the ripple of lower sheet space to be welded (6)、Template is suitable，The back side of fixed plate (1) is provided with gas shield groove (9) along the wing plate edge of fishplate bar pair to be welded，Gas shield groove (9) is provided with several air admission holes，Air admission hole is connected with air inlet pipe (3).
- Laser welding is fixed and gas shield frock by plate the most according to claim 1, it is characterised in that: being provided with locating piece (12) by two sides of described lower location-plate (10), locating piece (12) is plugged in fixed plate (1).
- Laser welding is fixed and gas shield frock by plate the most according to claim 1 and 2, it is characterised in that: the wing plate periphery of described fishplate bar pair to be welded is provided with several compressing tablet (8) being movably connected in fixed plate (1) by bolt (7).
- Laser welding is fixed and gas shield frock by plate the most according to claim 3, it is characterised in that: described gas shield groove (9) wide 2-5mm, deep 9-11mm, intake valve (11) is installed by each air admission hole.
- Laser welding is fixed and gas shield frock by plate the most according to claim 4, it is characterised in that: the upper seamed edge at described pressing plate (2) edge forms limit, slope through chamfered.
- Laser welding is fixed and gas shield frock by plate the most according to claim 5, it is characterised in that: the upper surface of described pressing plate (2) is provided with drop handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610369342.XA CN105834652B (en) | 2016-05-30 | 2016-05-30 | Plate is fixed by Laser Welding and gas shield tooling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610369342.XA CN105834652B (en) | 2016-05-30 | 2016-05-30 | Plate is fixed by Laser Welding and gas shield tooling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105834652A true CN105834652A (en) | 2016-08-10 |
| CN105834652B CN105834652B (en) | 2018-07-10 |
Family
ID=56595149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610369342.XA Active CN105834652B (en) | 2016-05-30 | 2016-05-30 | Plate is fixed by Laser Welding and gas shield tooling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105834652B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108465958A (en) * | 2018-04-18 | 2018-08-31 | 洛阳双瑞精铸钛业有限公司 | A kind of tooling for welding formula plate laser welding for titanium system half |
| CN110434464A (en) * | 2019-08-26 | 2019-11-12 | 山东旺泰科技有限公司 | The method for laser welding and tooling of heat exchange original part |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101264555A (en) * | 2008-05-06 | 2008-09-17 | 中国科学院上海光学精密机械研究所 | Numerical control radiator laser stitch welding machine |
| DE102007002492A1 (en) * | 2007-01-11 | 2008-09-25 | Deutsche Mechatronics Gmbh | Plate type heat exchanger with a fixing surface and a heat exchange and/or cooling useful in production of electrical and electronic components has increased heat exchange efficiency |
| CN101443619A (en) * | 2006-05-12 | 2009-05-27 | 卡朋罗兰化工设备有限公司 | Heat exchanger with welded heat exchange plates |
| CN103978291A (en) * | 2014-02-10 | 2014-08-13 | 上海楷鼎化工科技有限公司 | Corrugated plate, corrugated plate bundle and welding method |
| CN104668787A (en) * | 2013-11-28 | 2015-06-03 | 天津华赛尔传热设备有限公司 | Die alignment positioning platform for cutting plate heat exchanger corrugated plate sheets |
| CN204700438U (en) * | 2015-05-08 | 2015-10-14 | 大族激光科技产业集团股份有限公司 | Corrugated heat exchanger plates laser splices and penetrates the back protection device of weldering |
| CN105171240A (en) * | 2015-09-30 | 2015-12-23 | 甘肃蓝科石化高新装备股份有限公司 | Lapping full-penetration laser welding method for stainless steel heat exchange plates |
| CN205764609U (en) * | 2016-05-30 | 2016-12-07 | 兰州兰石集团有限公司 | Laser Welding is fixed and gas shield frock by plate |
-
2016
- 2016-05-30 CN CN201610369342.XA patent/CN105834652B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101443619A (en) * | 2006-05-12 | 2009-05-27 | 卡朋罗兰化工设备有限公司 | Heat exchanger with welded heat exchange plates |
| DE102007002492A1 (en) * | 2007-01-11 | 2008-09-25 | Deutsche Mechatronics Gmbh | Plate type heat exchanger with a fixing surface and a heat exchange and/or cooling useful in production of electrical and electronic components has increased heat exchange efficiency |
| CN101264555A (en) * | 2008-05-06 | 2008-09-17 | 中国科学院上海光学精密机械研究所 | Numerical control radiator laser stitch welding machine |
| CN104668787A (en) * | 2013-11-28 | 2015-06-03 | 天津华赛尔传热设备有限公司 | Die alignment positioning platform for cutting plate heat exchanger corrugated plate sheets |
| CN103978291A (en) * | 2014-02-10 | 2014-08-13 | 上海楷鼎化工科技有限公司 | Corrugated plate, corrugated plate bundle and welding method |
| CN204700438U (en) * | 2015-05-08 | 2015-10-14 | 大族激光科技产业集团股份有限公司 | Corrugated heat exchanger plates laser splices and penetrates the back protection device of weldering |
| CN105171240A (en) * | 2015-09-30 | 2015-12-23 | 甘肃蓝科石化高新装备股份有限公司 | Lapping full-penetration laser welding method for stainless steel heat exchange plates |
| CN205764609U (en) * | 2016-05-30 | 2016-12-07 | 兰州兰石集团有限公司 | Laser Welding is fixed and gas shield frock by plate |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108465958A (en) * | 2018-04-18 | 2018-08-31 | 洛阳双瑞精铸钛业有限公司 | A kind of tooling for welding formula plate laser welding for titanium system half |
| CN108465958B (en) * | 2018-04-18 | 2020-11-10 | 洛阳双瑞精铸钛业有限公司 | Tool for laser welding of titanium semi-welded plate |
| CN110434464A (en) * | 2019-08-26 | 2019-11-12 | 山东旺泰科技有限公司 | The method for laser welding and tooling of heat exchange original part |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105834652B (en) | 2018-07-10 |
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