GB2048413A - Fusion welding of pipe parts - Google Patents

Fusion welding of pipe parts Download PDF

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Publication number
GB2048413A
GB2048413A GB8009513A GB8009513A GB2048413A GB 2048413 A GB2048413 A GB 2048413A GB 8009513 A GB8009513 A GB 8009513A GB 8009513 A GB8009513 A GB 8009513A GB 2048413 A GB2048413 A GB 2048413A
Authority
GB
United Kingdom
Prior art keywords
clamp
support
pipe part
pipe
fusion welding
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
Application number
GB8009513A
Other versions
GB2048413B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FUSION EQUIPMENT Ltd
Original Assignee
FUSION EQUIPMENT Ltd
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 FUSION EQUIPMENT Ltd filed Critical FUSION EQUIPMENT Ltd
Priority to GB8009513A priority Critical patent/GB2048413B/en
Publication of GB2048413A publication Critical patent/GB2048413A/en
Application granted granted Critical
Publication of GB2048413B publication Critical patent/GB2048413B/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • 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
    • B23K37/0533—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 external pipe alignment clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints

Abstract

A holding device for use in the fusion welding together of two pipe parts 19, 22 comprises a clamp 2 for clamping the first pipe part 19 and support 1 for supporting the clamp 2. The support 1 is fixedly mounted on the base 16 of a fusion welding machine. The position of the clamp 2 is adjustable relative to the support 1 in two mutually perpendicular directions in a plane perpendicular to the axis of the clamp by means of vertical adjusters (8 Fig. 3 not shown) and two oppositely directed, outwardly extending arms 5 of the clamp 2 which cooperate with respective slots in pillars 4 of the support, to allow the first pipe part 19 to be aligned with the second pipe part 22 which is clamped in a clamp 17 which is slidably movable by lever 18 on the base towards and away from the holding device. <IMAGE>

Description

SPECIFICATION Fusion welding of pipe parts This invention relates to the fusion welding together of two pipe parts.
It is known to use fusion welding to connect together pipe parts of polyolefinic material such as polyethylene or polypropylene.
When two plain pipe ends are connected directly together in this manner a butt weld is obtained and the operation is referred to a butt fusion welding. When a spigot and socket connection is made using fusion welding the operation is referred to a socket fusion welding. Socket fusion welding can be employed for connecting together two or more plain pipe ends by using a connecting fitting having sockets for receiving and being fused with the pipe ends.
A problem in fusion welding is the accurate alignment of the pipe parts to be joined. It is well known to use a machine having relatively movable clamps for clamping the respective pipe parts but heretofore alignment of one pipe part with respect to the other has been effected by releasing and readjusting the clamp. Thus, the simultaneous achievement of good alignment and clamping, in practice, is tedious at best and often not realised.
An object of the present invention is to avoid the above-mentioned problem.
The invention includes a holding device for use in the fusion welding together of two pipe parts, comprising a clamp for clamping a first pipe part and a support for supporting the clamp, the position of the clamp being adjustable relative to the support in order to allow the first pipe part clamped by the clamp to be aligned with the second pipe part.
In order that the invention may be well understood, two embodiments thereof, which are given by way of example only, will now be described, reference being had to the accompanying drawings, in which: Figures 1 to 3 are respectively plan, side and front views of a support; Figures 4 and 5 are respectively front and plan views of a clamp, shown clamping a connector; Figures 6 to 9 illustrate a method of aligning the clamp on a fusion welding machine; Figure 10 illustrates an alternative method of aligning the clamp; and Figure 11 is a front view of an alternative clamp.
Referring now to Figs. 1 to 5, there is shown a support 1 adapted to be fixedly or slidably mounted on the frame of a fusion welding machine and a clamp 2 for clamping a pipe part. The support 1 has a base 2 provided with mounting holes 3 and is provided with two upstanding, spaced apart pillars 4. The clamp has two oppositely directed, outwardly extending arms 5. The arms 5 and pillars 4 are connectable so that the position of the clamp relative to the support is adjustable in two mutually perpendicular directions relative to the axis 6 of the clamp. That is, parallel to the pillars and parallel to the arms.
The connection that allows for this movement in the illustrated embodiment is a slotted connection. More specifically, each pillar 4 is provided with a longitudinal slot 7 along and through which the respective arms 5 of the clamp extend in use.
The support is provided with threaded adjusters 8 the tops 9 of which act on the arms 5, and a tightening screw 10 extends through each pillar across the slot 7 thereof such that when tightened the surfaces 11 of the pillar defining the slot 7 are moved relatively together to grip the clamp arm 5 located in the slot. As shown, the screws 10 are threadedly received in a rear portion 12 of the pillar and the front portion 13 of the pillar is movable towards the rear portion on such tightening.
The rear portion 12 is much more rigid that the front portion and remains substantially undeflected during such tightening such that the surface of the slots defined by the rear portions remain in substantially the same plane during tightening of the screws 10.
In an alternative arrangement (not illustrated) the screws 10 are not threadingly received within the rear portions 12 of the pillars for effecting gripping of the arms 5 of the clamp in the slots 7, but instead gripping is effected by means of a spring steel strip on each pillar lying against the surface 11 of the front portion 13 thereof, the strip being secured at one end to the front portion and being displaceable at the other end from the surface 11 of the front portion 13 towards the rear portion 12 by engagement with the end of a screw 10 such that an arm 5 of the clamp located between the two ends of the strip can be clamped between the rear portion 12 and the strip on tightening of the screw 10.
The clamp 2 is annular and provided with a tightening screw 14. A straight-through socket connector 15 is illustrated in position in the clamp 2.
Reference will now be made to Figs. 6 to 9 to illustrate the use of the holding device comprising the support 1 and clamp 2 on a fusion welding machine. The support 1 is fixedly mounted on the frame, or base, 16 of the machine which is provided with a slidable clamp 17 which is movable towards and away from the support 1 by means of a handle 18.
In order to make a socket fusion joint the clamp 2 is clamped around the socket connector 15. The connector may be at the end of a pipe length 19 as illustrated for example by attachment thereto by a prior fusion welding operation or by some other manufacturing operation. The clamp 2 is lowered onto the support as illustrated in Fig. 6 such that the arms 5 are located in the slots 7 and rest on the screws 10. The handle 18 is operated to slide the clamp 17 towards the clamp 2 until the face 20 of the clamp 17 abuts the face 21 of the connector 15. The degree of clamping of the connector 15 by the clamp 2 through the screw 14 is such that pressure on the face 21 exerted by the face 20 through operation of the handle 18 aligns the connector with the clamp 17 such that those faces 20, 21 are flush.The clamp 2 is fully tightened using the screw 14 while the faces are maintained in this flush condition (Fig. 7) thus fixing the face 21 of the connector parallel to the face 20 of clamp 17 and also with the faces 11 of the rear portions 12 of the pillars 4 since these faces 11 are made parallel to face 20 when the support is secured to the frame 16.
A pipe length 22 to be socket fusion welded to the connector 15 is clamped in the clamp 17 with an end portion 23 which is to be located within the connector 15 protruding from the clamp 17. The handle 18 is operated to move the pipe end portion 23 into contact with the face 21 of the connector (Fig. 8). The position of the clamp 2 relative to the support 1 is then adjusted to align the connector with the pipe end portion 23 as follows. First, the vertical position of the clamp is adjusted by screwing the adjusters 8, which act on the arms 5 of the clamp 2, up and/or down until the top extremity of the pipe end portion 23 coincides with the top extremity of the inside surface of the socket bore of the connector.Next the horizontal position of the clamp is adjusted by moving the clamp laterally between the pillars 4, with the arms 5 sliding over the tops 9 of adjusters, until the pipe end portion is concentric with the socket bore of the connector (Fig. 9).
The handle 18 is used to exert a force between the pipe end portion and the connector while the tightening screws 10 are fully tightened to secure the clamp 2 in its aligned position relative to the support. Fusion welding of the pipe end portion to the socket can then be carried out in the conventional manner, the surfaces to be fused first being heated by a heating tool prior to insertion of the pipe end portion into the socket bore.
An alternative method of aligning the clamp on the machine is illustrated in Fig. 10, the face 21 of the connector is fixed parallel to the face 20 of the clamp 17 as before and subsequent alignment by adjusting the position of the clamp 2 relative to the support 1 in two mutually perpendicular directions in a plane perpendicular to the axis of the clamp is achieved using an alignment mandrel 30 having a female end 31 which is fitted to the end portion 23 of the pipe length 22 after the pipe length has been clamped in the clamp 17 and a tapered male end 32 insertable into the connector 15. The position of the clamp 2 is adjusted manually, the arms 5 being moved horizontally and vertically in the slots of the pillars until the bore of the fitting 15 is able to receive the tapered male end 32 of the mandrel 30 when the clamp 17 is slid towards the clamp.The operating lever 18 is used to slide the clamp 17 towards the clamp 2 such that the tapered male end portion 32 is received within the fitting 15 to act to align the bore of the socket with the pipe length end portion.
With the tapered end portion 32 firmly engaged within the fitting 15, the tightening screws 10 are fully tightened to secure the clamp 2 relative to the support 1. It will be appreciated that if the mandrel 30 is used to effect alignment, it is not necessary to provide the support with the adjusters 8 for adjusting the vertical position of the clamp 2.
Fig. 11 shows an alternative clamp 2' provided with arms 5' and which comprises two hinged portions 24 and 25. The arms 5' are integrally fixed to the bottom clamp portion 24 and the top clamp portion 25 is hinged at 26 to the bottom clamp portion 24 adjacent one arm 5' and releasably securable to the clamp portion 24 adjacent the other arm 5' by means of a fastening 27 pivoted to the clamp portion 24. The portion 24 is pivotable between a closed clamping position, as illustrated, and an open position which allows pipe parts, such as the connector 15 referred to earlier, to be removed from and inserted into the clamp 2' without the need to remove the clamp from its previously aligned position in the support 1. This enables a plurality of similar fusion welding operations to be carried out without the need to align the clamp prior to each operation.
Removable liners 33 schematically illustrated in dotted line in Fig. 11, can be provided in different sizes so that the clamp can be adapted for use with fittings having a range of outside diameters.
It is to be understood that by using alternative clamp constructions the above described holding device can be used for butt fusion welding and socket fusion welding of more complex pipe fittings than the connector 15 illustrated. Such alternative clamp constructions would be provided with arms 5 for cooperation with the pillars 4 of the support as described above.

Claims (1)

1. A holding device for use in the fusion welding together of two pipe parts, comprising a clamp for clamping a first pipe part and a support for supporting the clamp, the position of the clamp being adjustable relative to the support in order to allow the first pipe part clamped by the clamp to be aligned with the second pipe part.
2. A device as claimed in claim 1 wherein the position of the clamp relative to the sup port is adjustable in two mutually perpendicular directions in a plane perpendicular to the axis of clamp.
3. A device as claimed in claim 2, wherein said relative movement is provided by a slotted connection between two oppositely directed, outwardly extending arms of said clamp and two upstanding pillars of said support.
4. A device as claimed in claim 3, wherein the pillars are each provided with a longitudinal slot along and through which the respective arms of the clamp are movable.
5. A device as claimed in claim 4, wherein the support includes adjusting means for adjusting the position of the arms along the slots.
6. A device as claimed in 4 or 5, wherein the surfaces of each pillar defining the slot thereof are movable together to grip the clamp arm associated with the slot.
7. A device as claimed in claim 4 or 5, wherein a spring strip secured to one face of the slot is movable towards the other face of the slot to grip the clamp arm associated with the slot.
8. A device as claimed in any one of the preceding claims, wherein the clamp is openable and closable to allow for insertion thereinto and removal therefrom of a said first pipe part without altering the relative position of the clamp when closed from a predetermined position.
9. A device as claimed in any one of the preceding claims, wherein the clamp is provided with removable liners to enable it to be used for clamping first pipe parts of different outside diameters.
10. A holding device for use in the fusion welding together of two pipe parts, substantially as herein described with reference to the accompanying drawings.
CLAIMS (4 Sept 1980)
1. A holding device for use in the fusion welding together of two pipe parts, comprising a clamp for clamping a first pipe part and a support for supporting the clamp, the position of the clamp being adjustable relative to the support in two mutually perpendicular directions in a plane perpendicular to the axis of clamp in order to allow the first pipe part clamped by the clamp to be aligned with the second pipe part.
GB8009513A 1979-04-05 1980-03-21 Fusion welding of pipe parts Expired GB2048413B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8009513A GB2048413B (en) 1979-04-05 1980-03-21 Fusion welding of pipe parts

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7912027 1979-04-05
GB8009513A GB2048413B (en) 1979-04-05 1980-03-21 Fusion welding of pipe parts

Publications (2)

Publication Number Publication Date
GB2048413A true GB2048413A (en) 1980-12-10
GB2048413B GB2048413B (en) 1983-06-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB8009513A Expired GB2048413B (en) 1979-04-05 1980-03-21 Fusion welding of pipe parts

Country Status (1)

Country Link
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134204A (en) * 1983-01-21 1984-08-08 British Nuclear Fuels Ltd Apparatus for aligning members
EP0133158A1 (en) * 1983-07-22 1985-02-13 Maschinenfabrik Flums AG Quick action chuck
FR2587272A1 (en) * 1985-09-19 1987-03-20 Gaz De France METHOD AND DEVICE FOR RECOVERING AND ALIGNING A FIRST PIECE OF PLASTIC MATERIAL, FOR EXAMPLE THERMOSOUDABLE WITH A SECOND PIECE OF SIMILAR PLASTIC MATERIAL, WHICH CAN ALSO BE RECTIFIED FOR THEIR ASSEMBLY END-TO-END
US5441588A (en) * 1994-01-04 1995-08-15 Big `O` Inc. Apparatus for producing a bell joint
US5609713A (en) * 1994-01-10 1997-03-11 Big `O` Inc. Method for producing a bell joint
FR2768362A1 (en) * 1997-09-16 1999-03-19 Puls Action Straightening and aligning, e.g., plastic pipes for connection
US6629551B1 (en) 1999-04-18 2003-10-07 Entegris, Inc. Beadless welding apparatus comprising a weld head having a bias member for axial displacement
US6694586B1 (en) * 1999-10-26 2004-02-24 Emerson Electric Co. Press tool for connecting workpieces by cold forming
EP3111034A4 (en) * 2014-01-13 2018-01-10 Getab AB Improved pipe clamp

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134204A (en) * 1983-01-21 1984-08-08 British Nuclear Fuels Ltd Apparatus for aligning members
EP0133158A1 (en) * 1983-07-22 1985-02-13 Maschinenfabrik Flums AG Quick action chuck
FR2587272A1 (en) * 1985-09-19 1987-03-20 Gaz De France METHOD AND DEVICE FOR RECOVERING AND ALIGNING A FIRST PIECE OF PLASTIC MATERIAL, FOR EXAMPLE THERMOSOUDABLE WITH A SECOND PIECE OF SIMILAR PLASTIC MATERIAL, WHICH CAN ALSO BE RECTIFIED FOR THEIR ASSEMBLY END-TO-END
EP0220095A1 (en) * 1985-09-19 1987-04-29 Gaz De France Method and apparatus for straightening and aligning a first plastics article, which may, for example, be heat-welded to a second similar plastics article, also alignable, to effect a butt joint therebetween
US5441588A (en) * 1994-01-04 1995-08-15 Big `O` Inc. Apparatus for producing a bell joint
US5609713A (en) * 1994-01-10 1997-03-11 Big `O` Inc. Method for producing a bell joint
FR2768362A1 (en) * 1997-09-16 1999-03-19 Puls Action Straightening and aligning, e.g., plastic pipes for connection
US6629551B1 (en) 1999-04-18 2003-10-07 Entegris, Inc. Beadless welding apparatus comprising a weld head having a bias member for axial displacement
US6694586B1 (en) * 1999-10-26 2004-02-24 Emerson Electric Co. Press tool for connecting workpieces by cold forming
EP3111034A4 (en) * 2014-01-13 2018-01-10 Getab AB Improved pipe clamp

Also Published As

Publication number Publication date
GB2048413B (en) 1983-06-15

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PCNP Patent ceased through non-payment of renewal fee