CA1222617A - Method of connecting inside plated cylindrical workpieces - Google Patents
Method of connecting inside plated cylindrical workpiecesInfo
- Publication number
- CA1222617A CA1222617A CA000431830A CA431830A CA1222617A CA 1222617 A CA1222617 A CA 1222617A CA 000431830 A CA000431830 A CA 000431830A CA 431830 A CA431830 A CA 431830A CA 1222617 A CA1222617 A CA 1222617A
- Authority
- CA
- Canada
- Prior art keywords
- groove
- workpieces
- welding
- welding material
- plating
- 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.)
- Expired
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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
- B23K33/006—Filling of continuous seams for cylindrical workpieces
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
- Metal Extraction Processes (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Cable Accessories (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
METHOD OF CONNECTING INSIDE PLATED CYLINDRICAL WORKPIECES
ABSTRACT OF THE DISCLOSURE
A method of connecting inside plated cylindrical workpiecs comprises arranging the workpieces to be connected in side by side relationship and providing as narrow as possible an asymmetric U-shaped butt groove between the workpieces leaving a root web at the end of the groove so that a minimum amount of welding material has to be introduced into the groove from the difficultly accessible inside of the workpiece and welding the two parts together by superimposing individual beads on one another and welding the remaining cross section of the basic material from the easily accessible outside of the work independently of the inside welding.
ABSTRACT OF THE DISCLOSURE
A method of connecting inside plated cylindrical workpiecs comprises arranging the workpieces to be connected in side by side relationship and providing as narrow as possible an asymmetric U-shaped butt groove between the workpieces leaving a root web at the end of the groove so that a minimum amount of welding material has to be introduced into the groove from the difficultly accessible inside of the workpiece and welding the two parts together by superimposing individual beads on one another and welding the remaining cross section of the basic material from the easily accessible outside of the work independently of the inside welding.
Description
~22Z6i~
17,043 .
METHOD OF CONNECTING INSIDE PLATED CYLINDRICAL l~ORKPIECES
:
FIELD AND BACKGROUND OF THE INVENTION
This invention relates in general to welding and in particular to a new and useful method of weldin~ workpieces which comprises forming a groove of minimu~ dimensions between the wor~pieces leaving a root web at a spaced location from the plating of the interior of the workpiece.
.
It is known to weld plated metal shets by providing an outside ~ weld penetrating the major part of the basic 10 material of the two cylindrical workpieces or tubes to be joined, and, in instances where the welding is effected only from the outside, extending also into the region of the plating material. Under conditions permitting also to perform the welding operation 4rom the inside, a wide strip of the plating 15 is removed in the zone of the joint and filled again with plating material upon introducing an intermediate layer.
This prior art method, used mainly for connecting plated workpieces in primaTy circulation systems of nuclear power plants, is disadvantageous in that the filling of the gaps 20 between the workpieces is expensive, both in material and labor.
Other disadvantages of this prior art method are:
-that because of the varying number of weld beads per layer~
the welding operation is difficult to mechanize ~'1
17,043 .
METHOD OF CONNECTING INSIDE PLATED CYLINDRICAL l~ORKPIECES
:
FIELD AND BACKGROUND OF THE INVENTION
This invention relates in general to welding and in particular to a new and useful method of weldin~ workpieces which comprises forming a groove of minimu~ dimensions between the wor~pieces leaving a root web at a spaced location from the plating of the interior of the workpiece.
.
It is known to weld plated metal shets by providing an outside ~ weld penetrating the major part of the basic 10 material of the two cylindrical workpieces or tubes to be joined, and, in instances where the welding is effected only from the outside, extending also into the region of the plating material. Under conditions permitting also to perform the welding operation 4rom the inside, a wide strip of the plating 15 is removed in the zone of the joint and filled again with plating material upon introducing an intermediate layer.
This prior art method, used mainly for connecting plated workpieces in primaTy circulation systems of nuclear power plants, is disadvantageous in that the filling of the gaps 20 between the workpieces is expensive, both in material and labor.
Other disadvantages of this prior art method are:
-that because of the varying number of weld beads per layer~
the welding operation is difficult to mechanize ~'1
- 2 - ~22~
-that the coarse-grain proportion in the heat-affected zone is relatively large, due to the steepness of the 1anks -and that in shop welding operations on fixed workpieces, the welding must be done from the outside and only subsequently from the inside.
It is also expensive and time consuming to prepare the wide grooves both in the plated zone and in the basic material.
It must be kept in mind in this connection that, for example if welding from the inside is also possible, the width of the groove in the plated zone is about 40 mm, and that a similar groove width is provided in the basic material at the outside.
SUMMARY OF T~IE I~rENTION
The invention is directed to a welding method avoiding the drawbacks enumerated in the foregoing and, particularly, making it possible to mechanize the welding process in a simple and reliable way, and to ensure welds of high quality free from ; flaws.
Accordingly it is an object of the invention to provide an improved welding method for welding workpieces particularly those which have been plated on the inside which comprises arranging the parts to be connected together forming a groove therebetween which leaves a root connection between the parts which is more spaced to the inside than to the outside so that the groove has terminations at the web root connection which are curved, filling the inside of the groove by welding then filling the outside of the groove on the opposite side of the root by welding.
A further object of the invention is to provide a method of ~22~
welding which is simple to carry out and inexpensive to execute.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and formlng a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which a preferred embodiment of the invention is illustrated.
t BRIEF DESCRIPTIO~ OF THE DRAWINGS
-In the drawings:
Fig. 1 is a diagrammatical sectional view of a gap prvovided between two workpieces or tubes to be joined, in its state before the welding;
Fig. 2 is a similar view showing the gap after the welding operation;
Fig. ~ is a similar ~iew of the gap provided for prior art welding in a welding shop;
Fig. 4 is a view corresponding to Fig. 3, showing the gap after the welding operation;
Fig. 5 is a similar view of a gap provided for prior art welding at a cons~ruction site; and Fig. 6 is a view corresponding to Fig. 5, showing the gap after performing the welding operation.
-that the coarse-grain proportion in the heat-affected zone is relatively large, due to the steepness of the 1anks -and that in shop welding operations on fixed workpieces, the welding must be done from the outside and only subsequently from the inside.
It is also expensive and time consuming to prepare the wide grooves both in the plated zone and in the basic material.
It must be kept in mind in this connection that, for example if welding from the inside is also possible, the width of the groove in the plated zone is about 40 mm, and that a similar groove width is provided in the basic material at the outside.
SUMMARY OF T~IE I~rENTION
The invention is directed to a welding method avoiding the drawbacks enumerated in the foregoing and, particularly, making it possible to mechanize the welding process in a simple and reliable way, and to ensure welds of high quality free from ; flaws.
Accordingly it is an object of the invention to provide an improved welding method for welding workpieces particularly those which have been plated on the inside which comprises arranging the parts to be connected together forming a groove therebetween which leaves a root connection between the parts which is more spaced to the inside than to the outside so that the groove has terminations at the web root connection which are curved, filling the inside of the groove by welding then filling the outside of the groove on the opposite side of the root by welding.
A further object of the invention is to provide a method of ~22~
welding which is simple to carry out and inexpensive to execute.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and formlng a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which a preferred embodiment of the invention is illustrated.
t BRIEF DESCRIPTIO~ OF THE DRAWINGS
-In the drawings:
Fig. 1 is a diagrammatical sectional view of a gap prvovided between two workpieces or tubes to be joined, in its state before the welding;
Fig. 2 is a similar view showing the gap after the welding operation;
Fig. ~ is a similar ~iew of the gap provided for prior art welding in a welding shop;
Fig. 4 is a view corresponding to Fig. 3, showing the gap after the welding operation;
Fig. 5 is a similar view of a gap provided for prior art welding at a cons~ruction site; and Fig. 6 is a view corresponding to Fig. 5, showing the gap after performing the welding operation.
- 3 -22~
DESCRIPTION OF T~IE PREFERE~ED_E~BODIMENT
As shown in ~ig. 1 in accordance with the method of the invention, workpieces or parts to be welded together generally designated 1 and 2 arranged in butting relationship in a very narrow dimensioned groove 10 and 10' are formed between the parts leaving a root web 7 which the parts abut. The grooves or gaps 10 and 10' have gap 1anks 5 and 6and 5' and 6' which are curved at their ends which abut against the root web 7. In accordance with the invention, the welding is carried out by filling the grooves with welding material first from the inside for example next to the side which is plated with a plating 4 and then by filling the opposite side with the weld material.
The inventive method is suitable particularly for connecting tubes and other workpieces which are plated on their inside, such as employed in nuclear power plants for primary circuits and pressure vessels. However, the application af the method is not limited to sectional joints in vessels or tube connect ions or pipeline joints, the inventive ~ethod may ~e applied 20 to any welding operation for connecting plated workpieces to one another.
The method in accordance with the invention is usable both for welds made in a welding shop, and for welds made directly at the construction site, i.e. the location where the workpieces 25 are installed or set up.
As shown in the figures, a workpiece 1 is to be connected by welding to a workpiece 2. The basic material, a ferritic steel as a rule, is indicated at 3, and the plating, an austenitic steel as a rule, is indicated at 4. These mater:ials, of course, 30 are present in the two`workpieces in identical proportion and arrangement. 4 Unlike in the V-shape of a prior art welding gap, the flanks of a welding gap or joint of the inventive method are made substantially parallel to each other both in the plated inner zone and in the outer zone. ~he gap flank of workpiece l is indicated at 5 and that of workpiece 2 at 6. Therebetween a root web is provided serving the purpose of positioning the workpieces relative to each other prior to the welding operation, and of determining the transition zone between the inner and outer welding processes. In construction site welds in accord-10 ance with the inven~tion, unlike in prior methods, root web 7is provided at a location spaced from plating 4, so ~hat in the welding operation the inner gap must first be filled with a basic material filler, with the volume of the inner weld being provided at least large enough to prevent this first 15 welded portion from breaking partially or completely under its own weight or other assemblage loads. In the zone o~ the root web, as a rule, the gap flanks 5, 6 are curved to quarter circles forming the surfaces of the web 7. The gaps on both sides are thus bounded by bottoms having semicircular cross 20 sections.
The welding operations described in the foregoing are known ; as TIG narrow-gap welding ~with TIG standing for tungsten inert gas shielded welding), and submerged-arc thin-wire narrow-gap welding. In welding operations on fixed workpieces 25 at construction sites, the TIG narrow-gap welding process is used, and the welding equipment is installed in the workpiece which is already joined in place, yet still open. Upon centering the workpieces to be now joined to each other, the new workpiece is fixed and the welding operation from the 30 inside can start, with no inside intervention into the operation of the equipment being necessary.
6 ~ ~2226~
While making welds on rotating workpieces with fixed welding heads in a welding shop, mostly the submerged-arc thin-wire narrow-gap welding process is applied, and the root web capable of being welded through is provided at a location such as to initially weld the entire basic material region from the outside, and subsequently the region of the plating from the inside.
Since with the inventive method, high quality welds are produced in a simple way and with a high economy in material, the method may be considered an ideal solution of the posed problems.
While a specific embodiment of the invention has been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.
r 6 ~
:
DESCRIPTION OF T~IE PREFERE~ED_E~BODIMENT
As shown in ~ig. 1 in accordance with the method of the invention, workpieces or parts to be welded together generally designated 1 and 2 arranged in butting relationship in a very narrow dimensioned groove 10 and 10' are formed between the parts leaving a root web 7 which the parts abut. The grooves or gaps 10 and 10' have gap 1anks 5 and 6and 5' and 6' which are curved at their ends which abut against the root web 7. In accordance with the invention, the welding is carried out by filling the grooves with welding material first from the inside for example next to the side which is plated with a plating 4 and then by filling the opposite side with the weld material.
The inventive method is suitable particularly for connecting tubes and other workpieces which are plated on their inside, such as employed in nuclear power plants for primary circuits and pressure vessels. However, the application af the method is not limited to sectional joints in vessels or tube connect ions or pipeline joints, the inventive ~ethod may ~e applied 20 to any welding operation for connecting plated workpieces to one another.
The method in accordance with the invention is usable both for welds made in a welding shop, and for welds made directly at the construction site, i.e. the location where the workpieces 25 are installed or set up.
As shown in the figures, a workpiece 1 is to be connected by welding to a workpiece 2. The basic material, a ferritic steel as a rule, is indicated at 3, and the plating, an austenitic steel as a rule, is indicated at 4. These mater:ials, of course, 30 are present in the two`workpieces in identical proportion and arrangement. 4 Unlike in the V-shape of a prior art welding gap, the flanks of a welding gap or joint of the inventive method are made substantially parallel to each other both in the plated inner zone and in the outer zone. ~he gap flank of workpiece l is indicated at 5 and that of workpiece 2 at 6. Therebetween a root web is provided serving the purpose of positioning the workpieces relative to each other prior to the welding operation, and of determining the transition zone between the inner and outer welding processes. In construction site welds in accord-10 ance with the inven~tion, unlike in prior methods, root web 7is provided at a location spaced from plating 4, so ~hat in the welding operation the inner gap must first be filled with a basic material filler, with the volume of the inner weld being provided at least large enough to prevent this first 15 welded portion from breaking partially or completely under its own weight or other assemblage loads. In the zone o~ the root web, as a rule, the gap flanks 5, 6 are curved to quarter circles forming the surfaces of the web 7. The gaps on both sides are thus bounded by bottoms having semicircular cross 20 sections.
The welding operations described in the foregoing are known ; as TIG narrow-gap welding ~with TIG standing for tungsten inert gas shielded welding), and submerged-arc thin-wire narrow-gap welding. In welding operations on fixed workpieces 25 at construction sites, the TIG narrow-gap welding process is used, and the welding equipment is installed in the workpiece which is already joined in place, yet still open. Upon centering the workpieces to be now joined to each other, the new workpiece is fixed and the welding operation from the 30 inside can start, with no inside intervention into the operation of the equipment being necessary.
6 ~ ~2226~
While making welds on rotating workpieces with fixed welding heads in a welding shop, mostly the submerged-arc thin-wire narrow-gap welding process is applied, and the root web capable of being welded through is provided at a location such as to initially weld the entire basic material region from the outside, and subsequently the region of the plating from the inside.
Since with the inventive method, high quality welds are produced in a simple way and with a high economy in material, the method may be considered an ideal solution of the posed problems.
While a specific embodiment of the invention has been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.
r 6 ~
:
Claims (3)
1. A method for connecting inside-plated cylindrical workpieces comprised of an outer tubular part made of a basic ferrous metal and of an alloy inside plating, particularly parts of main coolant lines of nuclear plants, by narrow-gap welding with a consumable or non-consumable electrode, comprising the step of shaping respective ends of the inside-plated cylindrical workpieces to be welded together such that when they abut each other, they contact each other at a root web portion, said root web portion providing a partition forming concavely shaped bottom of a first peripheral groove and of a second peripheral groove, said first peripheral groove being open inwardly of the workpieces, said second peripheral groove being opened outwardly of the workpieces; said first groove being as narrow as possible and including a pair of generally parallel side walls, the depth of said first groove being greater than the thickness of a layer of inside plating of the workpieces, the width of said first groove near the bottom thereof being uniform throughout its depth, whereby the width of the groove near the root web portion is the same as that at the inside surface of the workpieces, where the side walls of the first groove coincide with a lining layer of the workpieces; introducing welding material into the first groove; and welding the remaining cross-section by introducing welding material into the second groove.
2. Method of claim 1, wherein the width of the second groove is also generally uniform and as small as possible throughout the entire cross-section thereof, whereby a minimum amount of the welding material is to be introduced in the second groove.
3. Method of claim 1, wherein basic welding material is first introduced into the second groove then basic welding material is introduced into the first groove and, eventually, an alloy welding material is introduced into the first groove at its portion coinciding with the plating.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3225126.2-45 | 1982-07-06 | ||
| DE3225126A DE3225126C2 (en) | 1982-07-06 | 1982-07-06 | Method for joining internally clad cylindrical workpieces |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1222617A true CA1222617A (en) | 1987-06-09 |
Family
ID=6167681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000431830A Expired CA1222617A (en) | 1982-07-06 | 1983-07-05 | Method of connecting inside plated cylindrical workpieces |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0104325B1 (en) |
| JP (1) | JPS5913578A (en) |
| AT (1) | ATE18731T1 (en) |
| BR (1) | BR8303608A (en) |
| CA (1) | CA1222617A (en) |
| DE (2) | DE3225126C2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3520161A1 (en) * | 1985-06-05 | 1986-12-11 | MAN Gutehoffnungshütte GmbH, 4200 Oberhausen | MECHANIZED METHOD FOR WELDING CONNECTING THICK-WALL CONNECTORS TO CYLINDRICAL CONTAINER PARTS |
| EP0665079B1 (en) * | 1994-01-29 | 1999-01-07 | Asea Brown Boveri Ag | Method for bonding metallic pieces by arc fusion welding |
| FR2723870B1 (en) * | 1994-08-30 | 1996-11-15 | Framatome Sa | PROCESS FOR REPAIRING A HETEROGENEOUS WELDED LINK BETWEEN A TUBING OF A COMPONENT OF A NUCLEAR REACTOR AND A PIPING SYSTEM. |
| DE102005035585B3 (en) * | 2005-07-29 | 2006-08-10 | Areva Np Gmbh | Producing a welded joint between a plated ferritic part and an austenitic part comprises welding a root of austenitic material, welding an intermediate layer of nickel alloy forming a weld seam of nickel-based material |
| US20140034622A1 (en) * | 2012-08-03 | 2014-02-06 | Lincoln Global, Inc. | Method and system for narrow grove welding using laser and hot-wire system |
| CN105665898B (en) * | 2016-04-11 | 2017-12-15 | 鲁西工业装备有限公司 | A kind of pearlitic heat resistant steel composite board Lincoln weld welding method |
| CN112975189A (en) * | 2021-03-22 | 2021-06-18 | 保定天威保变电气股份有限公司 | Method for preventing high-strength steel weld joint of clamping piece web of converter transformer from cracking |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1977678A (en) * | 1933-06-20 | 1934-10-23 | Kellogg M W Co | Arc welding method |
| US2083234A (en) * | 1936-04-04 | 1937-06-08 | Smith Corp A O | Method of welding |
-
1982
- 1982-07-06 DE DE3225126A patent/DE3225126C2/en not_active Expired
-
1983
- 1983-06-23 AT AT83106137T patent/ATE18731T1/en not_active IP Right Cessation
- 1983-06-23 EP EP83106137A patent/EP0104325B1/en not_active Expired
- 1983-06-23 DE DE8383106137T patent/DE3362678D1/en not_active Expired
- 1983-06-24 JP JP58113011A patent/JPS5913578A/en active Pending
- 1983-07-05 CA CA000431830A patent/CA1222617A/en not_active Expired
- 1983-07-05 BR BR8303608A patent/BR8303608A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BR8303608A (en) | 1984-02-14 |
| ATE18731T1 (en) | 1986-04-15 |
| DE3362678D1 (en) | 1986-04-30 |
| EP0104325A1 (en) | 1984-04-04 |
| EP0104325B1 (en) | 1986-03-26 |
| JPS5913578A (en) | 1984-01-24 |
| DE3225126A1 (en) | 1984-01-12 |
| DE3225126C2 (en) | 1984-05-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |