NL2020116B1 - Welding device - Google Patents

Welding device Download PDF

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Publication number
NL2020116B1
NL2020116B1 NL2020116A NL2020116A NL2020116B1 NL 2020116 B1 NL2020116 B1 NL 2020116B1 NL 2020116 A NL2020116 A NL 2020116A NL 2020116 A NL2020116 A NL 2020116A NL 2020116 B1 NL2020116 B1 NL 2020116B1
Authority
NL
Netherlands
Prior art keywords
welding device
welding
fork
shell
cylindrical
Prior art date
Application number
NL2020116A
Other languages
Dutch (nl)
Inventor
Wilhelmus Elisabeth Lafleur William
Original Assignee
Sif Group
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sif Group filed Critical Sif Group
Priority to NL2020116A priority Critical patent/NL2020116B1/en
Application granted granted Critical
Publication of NL2020116B1 publication Critical patent/NL2020116B1/en

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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 to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
    • 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
    • B23K37/02—Carriages for supporting the welding or cutting element
    • B23K37/0211—Carriages for supporting the welding or cutting element travelling on a guide member, e.g. rail, track
    • B23K37/0235—Carriages for supporting the welding or cutting element travelling on a guide member, e.g. rail, track the guide member forming part of a portal
    • 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
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/047—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work moving work to adjust its position between soldering, welding or cutting steps
    • 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
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/025—Seam welding; Backing means; Inserts for rectilinear seams
    • B23K9/0253—Seam welding; Backing means; Inserts for rectilinear seams for the longitudinal seam of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q7/00—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting
    • B23Q7/005—Lifting devices

Abstract

The invention relates to a welding device for welding a cylindrical element. The welding device comprises a frame, a support configured to support the cylindrical element, a welding torch, a carrier arranged to position the welding torch for welding a joint in the top of a circumference of the cylindrical structure, wherein the welding device further comprises a lift attached to the frame, the lift comprises at least one tooth for entering the cylindrical structure, the welding device further comprises a controller arranged to move the fork from a first position, wherein the cylindrical element is resting on a supporting surface, towards a second position, wherein substantially all the weight of the cylindrical structure is carried by the fork.

Description

Welding device
Field of the invention
The present invention relates to a welding device for welding a cylindrical structure.
Background art
Such a welding device is known from CN201592306. The known welding device comprises a support to support the cylindrical / conical structure, a welding torch and a carrier to move a welding torch in a longitudinal direction of the cylindrical structure for welding a semi-narrow gap of the cylindrical structure.
The welding device can be used in welding devices for welding large structures such as shells for assembling piles. The piles can be used in, for example, oil platforms and/or wind turbines. A shell can be formed by preparing connecting edges of the rolled plate according to a specified weld joint type and rolling the steel plate in a pipe shape and welding longitudinally in a multipass weld. Presently and in the near future, the dimensions of these shells or cones are becoming larger, the diameter of a shell is presently in the range between 6 to 10 m. The length of the shell is between 2 and 4 m, and the thickness of the steel plates of the shell is between 60 and 120 mm.
The shells are fitted and welded to form large piles this assembly requires tight tolerances of the shells. Thereto, after the welding the shells /cones are re-rolled on a roll-bending machine to obtain the required dimensions of the specification. This postprocessing is time consuming and costly.
Summary of the invention
It is an object of the invention to provide a welding device that enables more efficient manufacturing of the cylindrical structures. This object can be achieved by the welding device in accordance with the invention, and is characterized in that the welding device comprises a frame, a support configured to support a cylindrical element, a welding torch for welding a joint in the top of a circumference of the cylindrical structure, wherein the welding device further comprises a lift attached to the frame, the lift comprises at least one fork arranged to entering the cylindrical structure, wherein the welding device further comprises a controller arranged to move the fork from the cylindrical structure from a first position, wherein the cylindrical element is resting on the support (roller bed) to a second position, wherein substantially all the weight of the cylindrical structure is carried by the fork. The cylindrical structure can be also tubular or conical structure and can also be indicated as shell.
The invention is based on the insight that the cylindrical structures, for example, shells are rolled from one or two steel plates. Then, the end of the rolled plate or plates are joined by a longitudinal weld or welds that is/are provided at the inside of the shell. After welding the inside of the shell, the outside of the joining ends of the shell is welded. Conventionally, the support is supporting the shell. However, it appears that when the shells are resting on a support, the circular shape of the shell is deformed in a radial direction due to the heavy weight of the shell. This phenomenon is known as angular distortion or peaking. The angular change depends on several parameters, such as shape and dimensions of the joint, thickness of the plates and the applied welding methods.
According to the invention when the shell is lifted by the fork that is entered in the shell, the weight of the shell is applied different points at the shell the radial deformation of the shell is reduced and efficient welding of the outside of the joints can be performed. A further advantage an improved safety in the manufacturing environment for manufacturing shell because in this arrangement the upper side of the shell is supported, whereas as in the conventional arrangement only the bottom side is supported which may cause instability when shell width a small length/ diameter ratio are welded.
In a particular advantageous embodiment of the welding torch, the fork is provided with an electrically conducting plate for electrical contact with the cylindrical structure and an electrically isolating plate between the fork and the electrically conducting plate. In this arrangement the welding currents can be guided along the shortest paths to the part of the cylindrical structure to be welded.
In a further embodiment the fork is provided with induction coils for preheating the gap of the cylindrical structure. In this arrangement the induction coils when connected to a power supply can induce eddy currents a portion of the cylindrical structure near the gap for pre-heating the metal.
In a further embodiment of the welding device, the carrier is further provided with guiding wheels for supporting and guiding the cylindrical structure when rotated around its longitudinal axis. In this arrangement the shell can be rotated such that a second joint of the shell, when present, can be welded. In this arrangement a part of the weight can be carried by the carrier to obtain a stable configuration.
In a further embodiment of the welding device the fork comprises two teeth. In this arrangement the weight of the shell can be divided between the teeth in a way that the forces in the teeth are reduced.
In a further embodiment of the welding device the welding device is arranged to move the carrier and the welding torch in a longitudinal direction along the cylindrical structure. In this arrangement a weld can be provided with subsequent layers in subsequent welding cycles in a longitudinal gap along the cylindrical structure.
In a further embodiment of the welding device, the lift comprises a hydraulic actuator positioned between the fork and the frame.
Short description of drawings
The present invention will be discussed in more detail below, with reference to the attached drawings, in which
Fig. 1 schematically shows schematically an embodiment of a welding device according to the invention;
Fig. 2 schematically shows a cross-section of a partly welded joint; and
Fig. 3 schematically shows a deviation of cross-section of the welding joint.
In the figures like reference numbers indicate like parts.
Description of embodiments
The invention is described with reference to figs. 1 to 3. A welding device can be used for welding large metal structures, cylindrical, conical or tubular segments or shells. These segments or shells can be assembled to piles for structures of wind generators and for off-shore platforms. The separate steel plates having a thickness in a range between 6 to 12 cm and a length in the range between 2 and 4 m and a diameter in the range between 6 and 10 m.
In this description a shell will used for the cylindrical, tubular or conical segment. The shell can be formed by rolling one or two steel plates. Due to limitation of the dimensions of the separate plates often more than one plate is required to obtain the shell. After rolling the plates, the sides of the rolled plates can be provisionally welded by tacks.
The side of the plates of the shells are then welded by respectively one or two longitudinal welds. The piles are assembled by fitting the shells and welding the circumferences of the adjacent shells. Due to the heavy weight of the shells much effort is required to obtaining tight tolerances of the specifications of the shell.
Fig. 1 shows schematically a welding device for welding a shell according to an embodiment of the invention. The welding device 1 comprises a frame 2. The welding device further comprises a support 3 configured to support the shell 4 and a carrier with a welding torch 5 configured for welding a joint in the top of a circumference of the shell. Furthermore, the welding device 1 comprises a lift 6 attached to the frame 2.
In this embodiment the lift can be provided with a rotatable or tiltable fork 7 for entering the shell 4. The fork 7 can be provided with one tooth or two teeth. The tooth or teeth are symmetrically positioned with respect to the joint in the top of the shell 4.
In an embodiment the lift is provided with a hydraulic actuator positioned between the fork and the frame 2.
In an embodiment the lift is provided with an electrical conducting plate 9 for electrical contact with the shell 4 for conducting the electrical currents for the welding process and an electrically isolating plate 10 between the lift 6 and the electrically conducting plate.
In an embodiment the tooth or teeth of the fork are provided with induction coils 11 for heating the shell. The induction coils 11 can be connected to a power supply for providing a current through the induction coils to generated eddy currents in a portion of the shell near the weld for pre-heating.
Furthermore, in an embodiment the welding device is provided with a controller 8. The controller is arranged to control the lift 6 to lift the shell 4 from a first position, wherein the shell is resting on the support 3, towards a second position, wherein substantially all the weight of the cylindrical structure is carried by the fork 7. The shell holder and rotating device 3 is positioned such that the joint of the shell 4 is under the carrier with the welding torch 5.
In an embodiment the carrier 3 is further provided with guiding wheels 12 for supporting and guiding the shell 4 and to rotate the shell around its longitudinal axis when the lift is in the first position. Furthermore, the support 3 can be adjustable for supporting shells having a length in the range between 2 and 4,2 m and diameter in the range of 6 to 10 m.
Furthermore, the position of the carrier and the welding torch 5 can be adjusted with respect to a symmetry axis of the gap so the consecutive welds can be made at defined positions with respect to the side wall as of the gap well known to the skilled person.
Furthermore, the welding device is provided with inverter power sources (not shown) which can be programmed to provide an AC or DC current through the welding torch, the electrode wires and the shell. The welding currents can be in the range between 800 - 850 A for DC welding and between 850 and 900 A for AC welding.
Before the longitudinal welding of the shell, a first groove and a second groove can be milled in the joining sides of the plates forming the shell. Thereafter, the welding is performed firstly at the first groove at the inner side of the shells, usually another welding device is used for welding the inner side of the joints in the shell. The welding can be based on a multi-wire submerged arc welding process.
In general, the grooves are asymmetrically positioned with respect to the centre of the steel plate in such a way that the groove at the inner side is less deep than the groove at the outer side of the shell. Thereafter, the welding is performed at the outer side using the welding device as described with reference to fig. 1.
During manufacturing of welded steel structures welding distortion occurs. Welding involves local heating and cooling of the workpiece. During the heating and cooling cycles the material endures non-uniform expansion and contraction. Furthermore, the material may undergo plastic deformation, phase transformation, recovery and recrystallization. All the phenomena may contribute to the formation of stresses in the workpiece, which may cause permanent welding distortion.
Fig 2 shows schematically a cross-section of a partly welded joint 20 in the shell 4. The joint 20 comprises a first welded groove 22 and the second non welded groove or gap 13. In an embodiment the thickness of the steel plate is 80 mm, the first welded groove 22 has a depth of 20 mm and the second non-welded groove 23 has a depth of 65 mm. The first welded groove 22 is provided with several layers 24 of welding material. In the second non-welded groove 13 an angle between a side wall and the normal on the plate is for example 4-6°. The radius R of the bottom part of the second non-welded grove or gap 13 is 8 mm. In order to weld the gap 13 of the joint, the two welding torches should initially be positioned close to the bottom in the gap 13. The welding torch is positioned in the gap 13 such that two consecutive layers can be nearly simultaneous welded in the gap 13 in a single welding cycle.
Fig. 3 the schematically a cross-section of a welded joint 20 in a portion of the shell 4. The joint 20 comprises a first welded groove 22 and a second welded groove 23. Furthermore, Fig. 3 shows a section of an imaginary circle 30 and the distortion δ in a radial direction after longitudinal welding of the shell from this imaginary circle 30 in a conventional device wherein the shell 4 is resting on its bottom side. Furthermore, the stress force in the material due to gravity on the shell is represented by the vectors F and momentum M. The angular change remaining after completion of the welding will depend on, inter alea, on the ration of depths of the grooves 22 and 23. In Fig. 3 the resulting distortion is oriented inwardly. During outside welding, the gravity force contributes to final deformation.
In the welding device according to the invention the upper part of the shell is supported by the fork and the stress forces are reduced, resulting in a reduced inward oriented deviation from the shell from the imaginary circle. So, that less post-processing is required. A further advantage is that the welding groove 23 is conform a predefined shape, because in this arrangement the resulting distortion is substantially reduced. So, that automatic welding can thus performed wherein the welding torch or welding torches 5 is positioned according to predefined paths for applying subsequent layers in the welding groove.
Fig. 4 shows a cross-section of the shell 4 and the fork 7. In this embodiment a supporting surface 40 of the fork 7 is conformal to the inside of the shell 4.
In the description of the figures, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the scope of the invention as summarized in the attached claims.
In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
In particular, combinations of specific features of various aspects of the invention may be made. An aspect of the invention may be further advantageously enhanced by adding a feature that was described in relation to another aspect of the invention.

Claims (11)

1. Lasinrichting voor een cilindrische constructie, de lasinrichting omvat een gestel, een ondersteuning ingericht voor het ondersteunen van de cilindrische constructie, een meervoudige lastoorts, een drager ingericht voor het verplaatsen van de lastoorts voor het lassen van een verbinding aan de bovenkant van de omtrek van de cilindrische constructie, waarbij de lasinrichting verder een lift bevat die aan het frame is bevestigd, waarbij de lift een vork omvat ingericht om in de cilindrische constructie te gaan, de lasinrichting omvat verder een besturingseenheid ingericht voor het verplaatsten van de vork van een eerste positie, waarbij het cilindrische element op de ondersteuning ligt, naar een tweede positie, waarbij nagenoeg het gehele gewicht van de cilindrische structuur wordt gedragen door de vork.1. Welding device for a cylindrical construction, the welding device comprising a frame, a support adapted to support the cylindrical construction, a multiple welding torch, a support adapted to move the welding torch for welding a connection at the top of the circumference of the cylindrical structure, wherein the welding device further comprises a lift attached to the frame, the lift comprising a fork adapted to enter the cylindrical structure, the welding device further comprises a control unit adapted to move the fork of a first position in which the cylindrical element lies on the support, to a second position, wherein substantially the entire weight of the cylindrical structure is supported by the fork. 2. Lasinrichting volgens conclusie 1, waarbij de lift is voorzien van een elektrisch geleidende plaat voor elektrische contact met de cilindrische constructie en een elektrisch isolerende plaat tussen de drager en de elektrisch geleidende plaat.Welding device according to claim 1, wherein the lift is provided with an electrically conductive plate for electrical contact with the cylindrical structure and an electrically insulating plate between the carrier and the electrically conductive plate. 3. Lasinrichting volgens conclusie 1, waarbij de vork is voorzien van inductielussen voor het verhitten van de cilindrische constructie.3. Welding device as claimed in claim 1, wherein the fork is provided with induction loops for heating the cylindrical structure. 4. Lasinrichting volgens conclusie 1, waarbij de drager verder is voorzien van geleide wielen voor het ondersteunen en geleiden van de cilindrische constructie, wanneer deze geroteerd wordt om de lengteas.The welding device of claim 1, wherein the carrier is further provided with guide wheels for supporting and guiding the cylindrical structure when it is rotated about the longitudinal axis. 5. Lasinrichting volgens één van de vorige conclusies, waarbij de vork twee tanden omvat.A welding device as claimed in any one of the preceding claims, wherein the fork comprises two teeth. 6. Lasinrichting volgens één van de vorige conclusies, waarbij de lasinrichting is ingericht voor het verplaatsen van de drager en de lastoorts in een lengterichting langs de cilindrische constructie.Welding device according to one of the preceding claims, wherein the welding device is adapted to move the carrier and the welding torch in a longitudinal direction along the cylindrical construction. 7. Lasinrichting volgens één van de vorige conclusies, waarbij de cilindrische constructie een buisvormige constructie, een conische constructie of een schaal is.A welding device according to any one of the preceding claims, wherein the cylindrical structure is a tubular structure, a conical structure or a shell. 8. Lasinrichting volgens één van de vorige conclusies, waarbij de lift een hydraulische actuator omvat die geplaatst is tussen de vork en het gestel.8. Welding device as claimed in any of the foregoing claims, wherein the lift comprises a hydraulic actuator which is placed between the fork and the frame. 9. Lasinrichting volgens één van de vorige conclusies, waarbij de vork draaibaar is bevestigd aan het gestel.Welding device according to one of the preceding claims, wherein the fork is rotatably attached to the frame. 10. Lasinrichting volgens één van de vorige conclusies, waarbij de vork ten minste één tand omvat.A welding device according to any one of the preceding claims, wherein the fork comprises at least one tooth. 11. Cilindrische constructie voorzien van een las aangebracht door een lasinrichting volgens één van de conclusies 1-10.11. Cylindrical construction provided with a weld applied by a welding device as claimed in any of the claims 1-10.
NL2020116A 2017-12-18 2017-12-18 Welding device NL2020116B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL2020116A NL2020116B1 (en) 2017-12-18 2017-12-18 Welding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2020116A NL2020116B1 (en) 2017-12-18 2017-12-18 Welding device

Publications (1)

Publication Number Publication Date
NL2020116B1 true NL2020116B1 (en) 2019-06-25

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ID=61257072

Family Applications (1)

Application Number Title Priority Date Filing Date
NL2020116A NL2020116B1 (en) 2017-12-18 2017-12-18 Welding device

Country Status (1)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1297056A (en) * 1969-03-12 1972-11-22
JP2010137267A (en) * 2008-12-15 2010-06-24 Akihisa Murata Horizontal type automatic welding equipment for workpiece and workpiece welding method using the same
KR20140050228A (en) * 2012-10-19 2014-04-29 주식회사 웰탑테크노스 Tig welder for welding washing machine drum
JP2017209721A (en) * 2016-05-27 2017-11-30 村田　彰久 Horizontal automatic welder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1297056A (en) * 1969-03-12 1972-11-22
JP2010137267A (en) * 2008-12-15 2010-06-24 Akihisa Murata Horizontal type automatic welding equipment for workpiece and workpiece welding method using the same
KR20140050228A (en) * 2012-10-19 2014-04-29 주식회사 웰탑테크노스 Tig welder for welding washing machine drum
JP2017209721A (en) * 2016-05-27 2017-11-30 村田　彰久 Horizontal automatic welder

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PD Change of ownership

Owner name: SIF NETHERLANDS B.V.; NL

Free format text: DETAILS ASSIGNMENT: CHANGE OF OWNER(S), CHANGE OF LEGAL ENTITY; FORMER OWNER NAME: SIF GROUP

Effective date: 20210604

PD Change of ownership

Owner name: SIF HOLDING N.V.; NL

Free format text: DETAILS ASSIGNMENT: CHANGE OF OWNER(S), CHANGE OF LEGAL ENTITY; FORMER OWNER NAME: SIF NETHERLANDS B.V.

Effective date: 20210914