GB2158385A - Butt welding pipe ends - Google Patents

Butt welding pipe ends Download PDF

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Publication number
GB2158385A
GB2158385A GB08510565A GB8510565A GB2158385A GB 2158385 A GB2158385 A GB 2158385A GB 08510565 A GB08510565 A GB 08510565A GB 8510565 A GB8510565 A GB 8510565A GB 2158385 A GB2158385 A GB 2158385A
Authority
GB
United Kingdom
Prior art keywords
ring
pipe ends
weld
welding
pipe
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.)
Withdrawn
Application number
GB08510565A
Other versions
GB8510565D0 (en
Inventor
Leslie Carrick
Anthony James Wareing
Anthony Bell Hick
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.)
Sellafield Ltd
Original Assignee
British Nuclear Fuels PLC
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
Priority claimed from GB848411823A external-priority patent/GB8411823D0/en
Application filed by British Nuclear Fuels PLC filed Critical British Nuclear Fuels PLC
Priority to GB08510565A priority Critical patent/GB2158385A/en
Publication of GB8510565D0 publication Critical patent/GB8510565D0/en
Publication of GB2158385A publication Critical patent/GB2158385A/en
Withdrawn legal-status Critical Current

Links

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
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/0203—Inserts
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5057—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like positioned between the surfaces to be joined
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5064—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like of particular form, e.g. being C-shaped, T-shaped
    • B29C65/5071—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like of particular form, e.g. being C-shaped, T-shaped and being composed by one single element
    • 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
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • 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
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

For the butt welding there is provided a ring of weld material 1 having a rebate or recess 2,3 in each end face and about the inner periphery of the ring to provide seats for respective pipe ends 4,5. The pipe ends are located in the seats to hold the ring in position during fusing of the ring to form the butt weld. <IMAGE>

Description

SPECIFICATION An improved method of welding The present invention concerns welding, in particular a method of butt welding pipe ends.
It is known to employ consumable inserts for the root run of pipe butt welds. The consumable inserts require cutting to length, forming into rings of the required diameter and fitting to the pipes. This can be a time consuming and difficult procedure.
According to the present invention a method of butt welding pipe ends comprises providing a ring of weld material having end faces at a radially inner portion of the ring, forming pipe ends with faces complementary to the profiled end faces in the ring, inserting the ring between the pipe ends, bringing the pipe ends together to hold the ring therebetween with a radially outer portion of the ring encircling the pipe ends and fusing the ring to butt weld the pipe ends.
Preferably, the method comprises forming the ring with an internal diameter substantially equal to the internal diameter of the pipe ends and forming a rebate in each end face of the ring at the inner periphery thereof to provide seats for the respective pipe ends. Conviently, the radially outer portion of the ring encircling the pipe ends is triangular in section.
The invention will be described further, by way of example, with reference to the accompanying drawings; in which: Figure 1 shows, in section, a weld ring positioned between the ends of two pipes; and Figure 2 is a section on A-A in Fig. 1.
A weld ring 1 is formed with rebates or recesses 2 and 3 in its respective end faces.
Pipe ends 4 and 5, which have a complementary square edge preparation, fit in the rebates or recesses 2 and 3. The internal diameter of the ring is substantially equal to the internal diameter of the pipe ends and the diameter of each rebate or recess is substantially equal to and not less than the outside diameter of the respective pipe end The portion of the ring 1 encircling the pipe end is preferably triangular in section with the apex 6 of the triangle being on the transverse plane of symmetry.
Although the outer portion of the ring can have other profiles, for example semi-circular, a triangular section is advantageous as the apex 6 provides a visual reference for either manual welding or the positioning of an orbital welding head to effect fusion of the ring to the pipe ends. A jig or support can be provided to hold the pipe ends in the rebates or recesses during the welding operation. Initially, the pipe ends can be held apart and the weld ring is fitted to the end of one of the pipes by locating that end in the rebate or recess in one end face of the ring. The end of the other pipe is then moved to sit in the rebate or recess in the other end face of the ring. The ring is thereby held in place to allow an operator freedom to perform the welding operation.
As an alternative, the ring can be a diamond-shaped section adapted to sit in complementary channel formed by chamfering or bevelling the pipe ends. In such an arrangement the ring will initially sit in the channel with the adjacent ends of the pipes being spaced apart by a small gap. The upper triangular portion of the diamond-section ring encircles the pipe ends with the apex of the triangle at substantially the transverse plane of symmetry. As before it is only necessary for an operator to fusion the ring to obtain a weld across the thickness of the walls of the pipes.
The material of the weld ring is chosen for compatability with, and ease of welding to, the material of the pipes which latter can be stainless steel.
The ring 1 is capable of being fused in a single pass to provide all the required filler material to complete a joint giving both acceptable root penetration and weld reinforcement.
The use of preformed weld rings for butt welding results in a number of advantages over existing techniques. Briefly, the advantages are: 1. Ease of pipe preparation and fitting of the joint.
2. Avoidance of variation in cast to cast weldability.
3. Use of simplified orbital weld heads (wire feed and automatic arc voltage control are not required).
4. Use of manual welding.
5. Avoidance of negative purge systems on large diameter pipes.
6. Simplification of radiographic interpretation due to uniformity of the weld.
1. A method of butt welding pipe ends which comprises providing a ring of weld material having profiled end faces at a radially inner portion of the ring, forming pipe ends with faces complementary to the profiled end faces in the ring, inserting the ring between the pipe ends, bringing the pipe ends together to hold the ring therebetween with a radially outer portion of the ring encirculing the pipe ends and fusing the ring to butt weld the pipe ends.
2. A method of butt welding as claimed in Claim 1 which comprises forming the ring with an internal diameter substantially equal to the internal diameter of the pipe ends and forming a rebate in each end face of the ring at the inner periphery thereof to provide seats for the respective pipe ends.
3. A method of butt welding as claimed in Claim 1 or 2 in which the radially outer portion of the ring encircling the pipe ends is
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION An improved method of welding The present invention concerns welding, in particular a method of butt welding pipe ends. It is known to employ consumable inserts for the root run of pipe butt welds. The consumable inserts require cutting to length, forming into rings of the required diameter and fitting to the pipes. This can be a time consuming and difficult procedure. According to the present invention a method of butt welding pipe ends comprises providing a ring of weld material having end faces at a radially inner portion of the ring, forming pipe ends with faces complementary to the profiled end faces in the ring, inserting the ring between the pipe ends, bringing the pipe ends together to hold the ring therebetween with a radially outer portion of the ring encircling the pipe ends and fusing the ring to butt weld the pipe ends. Preferably, the method comprises forming the ring with an internal diameter substantially equal to the internal diameter of the pipe ends and forming a rebate in each end face of the ring at the inner periphery thereof to provide seats for the respective pipe ends. Conviently, the radially outer portion of the ring encircling the pipe ends is triangular in section. The invention will be described further, by way of example, with reference to the accompanying drawings; in which: Figure 1 shows, in section, a weld ring positioned between the ends of two pipes; and Figure 2 is a section on A-A in Fig. 1. A weld ring 1 is formed with rebates or recesses 2 and 3 in its respective end faces. Pipe ends 4 and 5, which have a complementary square edge preparation, fit in the rebates or recesses 2 and 3. The internal diameter of the ring is substantially equal to the internal diameter of the pipe ends and the diameter of each rebate or recess is substantially equal to and not less than the outside diameter of the respective pipe end The portion of the ring 1 encircling the pipe end is preferably triangular in section with the apex 6 of the triangle being on the transverse plane of symmetry. Although the outer portion of the ring can have other profiles, for example semi-circular, a triangular section is advantageous as the apex 6 provides a visual reference for either manual welding or the positioning of an orbital welding head to effect fusion of the ring to the pipe ends. A jig or support can be provided to hold the pipe ends in the rebates or recesses during the welding operation. Initially, the pipe ends can be held apart and the weld ring is fitted to the end of one of the pipes by locating that end in the rebate or recess in one end face of the ring. The end of the other pipe is then moved to sit in the rebate or recess in the other end face of the ring. The ring is thereby held in place to allow an operator freedom to perform the welding operation. As an alternative, the ring can be a diamond-shaped section adapted to sit in complementary channel formed by chamfering or bevelling the pipe ends. In such an arrangement the ring will initially sit in the channel with the adjacent ends of the pipes being spaced apart by a small gap. The upper triangular portion of the diamond-section ring encircles the pipe ends with the apex of the triangle at substantially the transverse plane of symmetry. As before it is only necessary for an operator to fusion the ring to obtain a weld across the thickness of the walls of the pipes. The material of the weld ring is chosen for compatability with, and ease of welding to, the material of the pipes which latter can be stainless steel. The ring 1 is capable of being fused in a single pass to provide all the required filler material to complete a joint giving both acceptable root penetration and weld reinforcement. The use of preformed weld rings for butt welding results in a number of advantages over existing techniques. Briefly, the advantages are:
1. Ease of pipe preparation and fitting of the joint.
2. Avoidance of variation in cast to cast weldability.
3. Use of simplified orbital weld heads (wire feed and automatic arc voltage control are not required).
4. Use of manual welding.
5. Avoidance of negative purge systems on large diameter pipes.
6. Butt welds when formed by the method as claimed in any preceding claim.
6. Simplification of radiographic interpretation due to uniformity of the weld.
1. A method of butt welding pipe ends which comprises providing a ring of weld material having profiled end faces at a radially inner portion of the ring, forming pipe ends with faces complementary to the profiled end faces in the ring, inserting the ring between the pipe ends, bringing the pipe ends together to hold the ring therebetween with a radially outer portion of the ring encirculing the pipe ends and fusing the ring to butt weld the pipe ends.
2. A method of butt welding as claimed in Claim 1 which comprises forming the ring with an internal diameter substantially equal to the internal diameter of the pipe ends and forming a rebate in each end face of the ring at the inner periphery thereof to provide seats for the respective pipe ends.
3. A method of butt welding as claimed in Claim 1 or 2 in which the radially outer portion of the ring encircling the pipe ends is triangular in section.
4. A method of butt welding as claimed in Claim 3 in which the ring is substantially symmetrical about a plane through the apex of the triangular section and normal to the axis of the ring.
5. A method of butt welding pipe ends substantially as herein described with reference to the accompanying drawings.
GB08510565A 1984-05-09 1985-04-25 Butt welding pipe ends Withdrawn GB2158385A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08510565A GB2158385A (en) 1984-05-09 1985-04-25 Butt welding pipe ends

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB848411823A GB8411823D0 (en) 1984-05-09 1984-05-09 Butt welding pipe ends
GB08510565A GB2158385A (en) 1984-05-09 1985-04-25 Butt welding pipe ends

Publications (2)

Publication Number Publication Date
GB8510565D0 GB8510565D0 (en) 1985-05-30
GB2158385A true GB2158385A (en) 1985-11-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08510565A Withdrawn GB2158385A (en) 1984-05-09 1985-04-25 Butt welding pipe ends

Country Status (1)

Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2419836B (en) * 2004-11-09 2010-02-03 Eads Deutschland Gmbh Welding process using a filler
CN102343496A (en) * 2010-08-05 2012-02-08 上海锅炉厂有限公司 Weld line assembly positioning device and assembly position welding process method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB782927A (en) * 1954-01-11 1957-09-18 Gen Dynamics Corp Improved process for butt-welding metal parts and suitable insert for carrying out said process
GB2066715A (en) * 1979-07-05 1981-07-15 Parker Hannifin Corp Workpiece assembly for welded butt joint

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB782927A (en) * 1954-01-11 1957-09-18 Gen Dynamics Corp Improved process for butt-welding metal parts and suitable insert for carrying out said process
GB2066715A (en) * 1979-07-05 1981-07-15 Parker Hannifin Corp Workpiece assembly for welded butt joint

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2419836B (en) * 2004-11-09 2010-02-03 Eads Deutschland Gmbh Welding process using a filler
CN102343496A (en) * 2010-08-05 2012-02-08 上海锅炉厂有限公司 Weld line assembly positioning device and assembly position welding process method thereof
CN102343496B (en) * 2010-08-05 2015-07-15 上海锅炉厂有限公司 Weld line assembly positioning device and assembly position welding process method thereof

Also Published As

Publication number Publication date
GB8510565D0 (en) 1985-05-30

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)