GB2116468A - Method of welding - Google Patents
Method of welding Download PDFInfo
- Publication number
- GB2116468A GB2116468A GB08206419A GB8206419A GB2116468A GB 2116468 A GB2116468 A GB 2116468A GB 08206419 A GB08206419 A GB 08206419A GB 8206419 A GB8206419 A GB 8206419A GB 2116468 A GB2116468 A GB 2116468A
- Authority
- GB
- United Kingdom
- Prior art keywords
- components
- dimension
- welding
- value
- values
- 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- Withdrawn
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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/04—Flash butt welding
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
When two components 1, 2 are welded together, e.g. by magnetically impelled arc butt welding, at two abutting faces, tolerance "stack-up" is avoided by determining a dimension (a+b) corresponding to a length measured across the two components when the faces are in abutment, and comparing it with a desired value or range of values for the dimension. The welding conditions are then selected so that the value (d) of the dimension in the finished article is equal to the desired value, or falls within a desired range of values. <IMAGE>
Description
SPECIFICATION
Method of welding
This invention relates to methods of welding two components.
In conventional magnetically impelled arc-butt (known as M.l.A.B.) welding processes an arc is struck between opposite faces of two components, and the faces are brought into abutment with each other when the material of the components has melted. This principle is used to join two coaxial tubular components together in the known rotating arc butt welding process in which an arc between two opposed circular end faces of the tubular components is caused to rotate rapidly about the common axis of the tube by applying a radial magnetic field.
Although M.l.A.B. welding is a simple and speedy process, the dimensions of a finished article incorporating a M.l.A.B. welded joint vary within tolerances determined by the sum of tolerances within which the two components were themselves manufactured. As a result of this "stack-up" of tolerances, use of the process in production may therefore lead to a broadening of production tolerances.
According to the present invention, there is provided a method of joining two components which comprises welding together two opposed faces of components, characterised by determining a dimension corresponding to a length measured across the two components with the opposed faces in contact with each other, comparing the determined dimension with a desired value or desired range of values for the dimension, and selecting the welding conditions so that the value of the dimension in the finished article is equal to or the desired value and falls within the desired range of values.
By selecting the welding conditions in accordance with the length of the article across the opposed faces before the welding process, the welding process itself is used to compensate for variations in size of the components so that the size of the finished article is unaffected by the manufacturing tolerances of the components.
A preferred embodiment of the invention will now be described by way of example only, with reference to the accompanying drawing which is a cross-section through two components joined together by the method of the invention.
Referring to the drawing, two tubular components 1 , 2 of similar material and external diameters are to be butt welded together along their respective annular end faces 3,4. The lengths of the two components are, nominally a and b cm respectively, and they are manufactured to within tolerances of +0.1cm.
In a conventional rotating arc butt welding process, an arc is struck between the opposed end faces 3,4 of the two components and is caused to rotate by generating a radial magnetic field along the common axes of the components. The power is maintained at a predetermined level sufficient to plasticise the material of the two components. Often, the arc may be generated in two stages, for example using a current of 400 amps for a period of seconds and thereafter a current of 700 amps for 7 seconds.
Thereafter the opposing faces 3,4 of the two components are brought into contact with each other so that the material from both components unite. The joint is then coded.
The final axial length d of the assembly across the joint will be [(a ~ 0.1) + (b + 0.1)-c ] cm, where c is the distance by which the assembly contracts as a result of radial displacement of the material when the two components are brought into abutment. Since the value of c will be approximately the same for all joints formed under similar welding conditions, the axial length of the finished article will vary within a tolerance of + 0.2 cm. Hence if the process is used on a large scale, the finished articles are produced within greater tolerance limits than the components.
In accordance with the present invention however, the dimension (a + b) corresponding to the axial length of the article measured across the two components with the abutting faces in contact with each other is first determined. This may be effected by measuring or gauging the lengths a and b separately and then adding the two lengths together, or by bringing the two faces into contact and measuring the combined lengths directly. Both measurements may be performed automatically in appropriate measuring equipment.
The dimension (a+b) is then compared with the desired value for the corresponding dimension d in the finished article, which in practice may vary within a range of tolerance e.g. (d + 0.1) cm.
The welding conditions are then selected such that the distance c by which the assembly will contract as a result of displacement of the material when the two components are brought into abutment brings the dimension (a+b) into the desired tolerance range, i.e. so that (a + b - c) = (d ~ 0.1).
The following table illustrates the various conditions under which two cylindrical articles are welded together by a rotating arc butt welding process.
The welding operation is effected in two stages. In each case, a current of 400 amps is applied which is thereafter increased to 700 amps in the second stage. The duration of the second stage is 1 second in each case where welding occurs, the duration of the last stage being varied in accordance with the combined lengths of the two components. Thus, as the combined lengths (a + b) of the component increases from 41.96 cm to 42.11 cm the first stage is increased from 2 to 8 seconds, thereby producing an assembly having a finished length of 41.91 cm. Where the combined lengths fail outside the range 41.91-42.11 cm no welding would be carried out since the resulting assembly would not have a length falling within the desired tolerance range.
(a + b) in cm 41.96 42.04 42.11 Duration of 1 st 7 10 stage (seconds) Duration of 2nd 1 1 1 stage (seconds) d. 41.91 41.91 41.91
Claims (3)
1. A method of joining two components which comprises welding together two abutting faces of the components, characterised by determining a dimension corresponding to a length measured across the two components with the abutting faces in contact with each other, comparing the determined dimension with a desired value or desired range of values for the dimension, and selecting the welding conditions so that the value of the dimension in the finished article is equal to the deseed value or falls within the desired range of values.
2. A method according to claim 2 wherein the components are tubular and are welded together by a magnetically-impelled arc butt welding process.
3. A method of welding two components substantially as hereinbefore described, and as illustrated in the drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08206419A GB2116468A (en) | 1982-03-04 | 1982-03-04 | Method of welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08206419A GB2116468A (en) | 1982-03-04 | 1982-03-04 | Method of welding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2116468A true GB2116468A (en) | 1983-09-28 |
Family
ID=10528790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08206419A Withdrawn GB2116468A (en) | 1982-03-04 | 1982-03-04 | Method of welding |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2116468A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995000281A1 (en) * | 1993-06-28 | 1995-01-05 | Automation International Incorporated | Welding assurance control techniques |
| GB2333484A (en) * | 1998-01-21 | 1999-07-28 | E O Paton Electric Welding Ins | Control of magnetically impelled arc butt welding |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB978687A (en) * | 1960-08-25 | 1964-12-23 | Schlatter Ag | A method for the resistance flash-butt welding of bevelled or mitred work pieces anda machine for performing such method |
| GB1115483A (en) * | 1964-06-12 | 1968-05-29 | Steinmueller Gmbh L & C | Improvements in or relating to methods of machine welding longitudinally finned tubes |
| GB1149736A (en) * | 1965-08-19 | 1969-04-23 | Wuppermann Gmbh Theodor | Method of improving the structure of welding seams in workpieces welded in a machine by the electric flash-butt-welding method |
| GB1163644A (en) * | 1967-06-23 | 1969-09-10 | Welders Ltd A I | Improvements in or relating to the Making of Joints by Flas-Butt Welding. |
| GB1261269A (en) * | 1969-06-11 | 1972-01-26 | Vnii Po Stroitelstvu Magistr | Method and for flash butt welding |
| GB1353104A (en) * | 1971-07-07 | 1974-05-15 | Lifshits V S | Method of flash-butt welding of articles |
-
1982
- 1982-03-04 GB GB08206419A patent/GB2116468A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB978687A (en) * | 1960-08-25 | 1964-12-23 | Schlatter Ag | A method for the resistance flash-butt welding of bevelled or mitred work pieces anda machine for performing such method |
| GB1115483A (en) * | 1964-06-12 | 1968-05-29 | Steinmueller Gmbh L & C | Improvements in or relating to methods of machine welding longitudinally finned tubes |
| GB1149736A (en) * | 1965-08-19 | 1969-04-23 | Wuppermann Gmbh Theodor | Method of improving the structure of welding seams in workpieces welded in a machine by the electric flash-butt-welding method |
| GB1163644A (en) * | 1967-06-23 | 1969-09-10 | Welders Ltd A I | Improvements in or relating to the Making of Joints by Flas-Butt Welding. |
| GB1261269A (en) * | 1969-06-11 | 1972-01-26 | Vnii Po Stroitelstvu Magistr | Method and for flash butt welding |
| GB1353104A (en) * | 1971-07-07 | 1974-05-15 | Lifshits V S | Method of flash-butt welding of articles |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995000281A1 (en) * | 1993-06-28 | 1995-01-05 | Automation International Incorporated | Welding assurance control techniques |
| GB2333484A (en) * | 1998-01-21 | 1999-07-28 | E O Paton Electric Welding Ins | Control of magnetically impelled arc butt welding |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |