KR101615918B1 - The welding method with double-head - Google Patents
The welding method with double-head Download PDFInfo
- Publication number
- KR101615918B1 KR101615918B1 KR1020150049268A KR20150049268A KR101615918B1 KR 101615918 B1 KR101615918 B1 KR 101615918B1 KR 1020150049268 A KR1020150049268 A KR 1020150049268A KR 20150049268 A KR20150049268 A KR 20150049268A KR 101615918 B1 KR101615918 B1 KR 101615918B1
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- Prior art keywords
- welding
- tip
- center
- electrode rod
- electrode
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- 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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- 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
- B23K37/0276—Carriages for supporting the welding or cutting element for working on or in tubes
-
- 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
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
Abstract
The welding apparatus according to the invention has at least two welding heads and the welding head is arranged at any two points of the pipe weld and arranged to proceed the welding in the same direction. Each of the welding heads is provided with an electrode.
The tip of the tip may be eccentrically spaced apart from the center of the tip fixed to the welding head. The tip of the tip may be eccentrically spaced from the center of the tip, .
Also, the eccentric electrode rod rotates while welding is proceeding, and the tip portion of the eccentric electrode rod draws a circle trace. As a result, the welding bead is uniformly formed in a uniform shape on the left and right sides. An improved welding effect can be obtained as compared with the case where the welding bead is biased to one side during welding with the electrode according to the prior art.
Description
BACKGROUND OF THE
General piping welding techniques use automatic gas tungsten arc welding (GTAW) method. Heavy-thickness piping can be welded by 360 degrees along the circumference of the pipe using a single welding device. However, since welding time is long and the direction of the upward and downward movements is repeated, There is a high risk of occurrence of welding defects.
In order to compensate for this, the double-up welding method is such that the welding head moves only from the 6 o'clock position to the 12 o'clock position in order to exclude the downward direction and weld only in the upward direction, and two welding devices can be used It is not very effective in reducing work time.
Therefore, the double-up welding technique is mainly used for high-alloy materials with high possibility of welding defect, and welding is always started at the same starting point (upper view direction) and finishes at the same end point of 12 o'clock. Is required.
The present invention is designed to reduce the amount of worker's exposure through the production of a healthy welded part and the reduction of work time by simultaneously performing welding work by mounting two orbital GTAW welding devices with improved performance in one pipe.
In order to achieve the above object, a welding apparatus according to an embodiment of the present invention includes at least two welding heads, and the welding head is arranged at any two points of the pipe weld and is arranged to proceed the welding in the same direction. Each of the welding heads is provided with an electrode.
The welding apparatus according to an embodiment has at least two welding heads and the welding head is arranged to proceed the welding in the same direction from any two points of the pipeline weld. Each of the welding heads is provided with an electrode.
One end of the electrode is fixed to the welding head, the other end is protruded, and the other end has a shape in which the end surface is gradually narrowed. The center of the resulting tip may be eccentrically spaced from the center of the one end.
The welding apparatus according to an embodiment has at least two welding heads and the welding head is arranged to proceed the welding in the same direction from any two points of the pipeline weld. Each of the welding heads is provided with an electrode.
One end of the electrode is fixed to the welding head, the other end is protruded, and the other end has a shape in which the end surface is gradually narrowed. The center of the resulting tip may be eccentrically spaced from the center of the one end.
The electrode rod is rotated with respect to the center of the one end, and the tip of the electrode rod forms a circular locus according to the rotational motion. At this time, the rotation of the electrode rod may be a structure in which the electrode rod is fixed to the welding head so as to rotate as a whole, or only the electrode rod rotates without rotating the welding head.
The welding apparatus according to an embodiment has at least two welding heads and the welding head is arranged to proceed the welding in the same direction from any two points of the pipeline weld. Each of the welding heads is provided with an electrode.
One end of the electrode is fixed to the welding head, the other end is protruded, and the other end has a shape in which the end surface is gradually narrowed. The center of the resulting tip may be eccentrically spaced from the center of the one end.
The electrode rod is rotated at a predetermined angle with respect to the center of the one end, and the tip of the electrode rod reciprocates in a section corresponding to a part of the circular path according to the rotational movement. That is, an arc locus corresponding to a certain angle as the electrode rod rotates. At this time, the rotation of the electrode rod may be a structure in which the electrode rod is fixed to the welding head so as to rotate as a whole, or only the electrode rod rotates without rotating the welding head.
A welding apparatus according to an embodiment has at least two or more welding heads and the welding head is arranged at any two points of the pipe weld and is arranged to proceed the welding in the same direction. After welding, each welding head terminates the welding when it reaches the welding start point of the other welding head. When all the welding heads finish welding, the entire welding operation is terminated. At this time, the welding apparatus may be one of the welding apparatuses according to the first, second, third and fourth embodiments.
A welding apparatus according to an embodiment comprises a first welding head and a second welding head as an apparatus for welding a joint between a first pipe and a second pipe. One end of the electrode rod of the first welding head is fixed to the first welding head and the other end is protruded toward the first pipe, and the other end is formed into a shape having a gradually narrowed section. And the center of the cross section of the resulting tip may be eccentrically spaced apart from the center of the one end.
One end of the electrode rod of the second welding head is fixed to the second welding head, the other end is protruded toward the second pipe, and the other end is formed into a shape having a gradually narrowed section. The center of the resulting tip may be eccentrically spaced from the center of the one end.
A welding apparatus according to an embodiment comprises a first welding head and a second welding head as an apparatus for welding a joint between a first pipe and a second pipe. One end of the electrode of the first welding head is fixed to the first welding head, the other end is protruded toward the first pipe, and the other end has a shape in which the end surface is gradually narrowed. The center of the resulting tip may be eccentrically spaced from the center of the one end.
One end of the electrode rod of the second welding head is fixed to the second welding head, the other end is protruded toward the second pipe, and the other end is formed into a shape having a gradually narrowed section. And the center of the cross section of the resulting tip may be eccentrically spaced apart from the center of the one end.
The first welding head and the second welding head perform welding in the same direction, and the first welding head performs one-time welding to finish the welding when the welding start point of the first welding head is reached, The welding is terminated when the welding start point of the second welding head is reached. When the welding of the first welding head and the second welding head is completed, the entire welding operation is terminated.
The welding apparatus according to one embodiment is located at a certain point in the base material welding portion, and each of the welding heads is provided with an electrode rod. One end of the electrode is fixed to the welding head, the other end is protruded, and the other end has a shape in which the end surface is gradually narrowed. The center of the resulting tip may be eccentrically spaced from the center of the one end fixed to the welding head.
The welding apparatus according to one embodiment is located at a certain point in the base material welding portion, and each of the welding heads is provided with an electrode rod. One end of the electrode is fixed to the welding head, the other end is protruded, and the other end has a shape in which the end surface is gradually narrowed. The center of the resulting tip may be eccentrically spaced from the center of the one end fixed to the welding head.
The electrode rod is rotated with respect to the center of the one end, and the tip of the electrode rod forms a circular locus according to the rotational motion. At this time, the rotation of the electrode rod may be a structure in which the electrode rod is fixed to the welding head so as to rotate as a whole, or only the electrode rod rotates without rotating the welding head.
The welding apparatus according to one embodiment is located at a certain point in the base material welding portion, and each of the welding heads is provided with an electrode rod. One end of the electrode is fixed to the welding head, the other end is protruded, and the other end has a shape in which the end surface is gradually narrowed. The center of the resulting tip may be eccentrically spaced from the center of the one end fixed to the welding head.
The electrode rod is rotated at a predetermined angle with respect to the center of the one end, and the tip of the electrode rod reciprocates in a section corresponding to a part of the circular path according to the rotational movement. That is, an arc locus corresponding to a certain angle as the electrode rod rotates. At this time, the rotation of the electrode rod may be a structure in which the electrode rod is fixed to the welding head so as to rotate as a whole, or only the electrode rod rotates without rotating the welding head.
According to an embodiment of the present invention, there is provided a method of welding a pipe using at least two or more welding heads each including an electrode rod, wherein each of the welding heads is arranged in the same direction The welding method of welding the piping weld.
According to an embodiment of the present invention, there is provided a method of welding a pipe using at least two or more welding heads each including an electrode rod, wherein each of the welding heads is arranged in the same direction A tip is formed at the other end, and a center of the tip is formed at a predetermined distance from the center of the one end It may be a welding method in which the pipe is welded using an eccentric member.
According to an embodiment of the present invention, there is provided a method of welding a pipe using at least two or more welding heads each including an electrode rod, wherein each of the welding heads is arranged in the same direction The tip of the electrode is fixed to the welding head and the other end is protruded. A certain section to the other end has a shape in which the end surface is gradually narrowed and a tip is formed at the other end. The electrode may be eccentrically spaced at a predetermined interval and the electrode may be rotated about the center of the one end so that the tip forms a circular path along with the rotation of the electrode rod to weld the pipe.
According to an embodiment of the present invention, there is provided a method of welding a pipe using at least two or more welding heads each including an electrode rod, wherein each of the welding heads is arranged in the same direction A tip is formed at the other end, and a center of the tip is formed at a predetermined distance from the center of the one end The electrode may be eccentrically rotated by reciprocating the electrode at a predetermined angle with respect to the center of one end so that the tip forms an arc locus corresponding to a certain angle in accordance with the rotation of the electrode rod.
A welding method according to an embodiment is a method of welding a joint of a first pipe and a second pipe, the method comprising a first welding head and a second welding head, the first welding head including a first electrode rod, The second welding head includes a second electrode rod, wherein the first electrode rod is fixed to the first welding head, the second electrode rod is fixed to the second welding head, the other end of the first electrode rod is projected toward the first pipe, The other end of the electrode rod protrudes toward the second pipe, and a tip is formed at the other end of the first electrode rod and the second electrode rod. The center of the tip is eccentrically spaced from the center of the one end, And terminating the piping welding when each of the welding heads reaches a point where the welding head itself starts welding.
A welding method according to an embodiment is a method of welding a base material using a welding head including an electrode rod, wherein the electrode rod is fixed to the welding head at one end and protrudes at the other end, A tip is formed at the other end, and the center of the tip may be a welding method in which the welding portion of the base material is welded while being eccentrically spaced apart from the center of the one end.
A welding method according to an embodiment is a method of welding a base material using a welding head including an electrode rod, wherein the electrode rod is fixed to the welding head at one end and protrudes at the other end, And the tips of the tips are rotated with respect to the center of one end in a state where the centers of the tips are eccentrically spaced apart from the center of the one end and the tip forms a circular path with rotation of the electrode rod So that the welded portion of the base material is welded.
A welding method according to an embodiment is a method of welding a base material using a welding head including an electrode rod, wherein the electrode rod is fixed to the welding head at one end and protrudes at the other end, And the tip of the tip is reciprocated at a predetermined angle with respect to the center of one end in a state where the center of the tip is eccentrically spaced apart from the center of the tip by a predetermined angle, A circular arc locus corresponding to the angle may be formed so as to weld the welded portion of the base material.
The welding apparatus according to an embodiment can start welding at a position where at least two or more welding heads are equally spaced from each other.
Since the present invention can be applied not only to maintenance work of a power plant during operation but also to a power plant or a plant construction under construction, it is possible to expect an excellent productivity improvement effect for automatic welding of a back pipe. This makes it possible to shorten the welding time by at least 40% over the method using one welding device.
In addition, there is no limitation on the starting position of the welding, so that the preparation time is fast, and even if one welding apparatus is stopped, the remaining one welding work can be performed. Especially designed eccentric electrode rod is excellent in welding defect prevention and enables operation of double head welding technique.
FIG. 1 shows a conventional piping welding method in which the pipe is rotated 360 degrees from the 12 o'clock position.
2 shows a method of welding a pipe joint using a conventional general electrode.
3 shows an embodiment of the double head method.
Figure 4 shows one embodiment of an eccentrically machined electrode bar
5 shows a method of welding using an eccentric electrode rod.
Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.
In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;
Conventionally, a method of welding a pipe is a method using one welding head as shown in Fig. The more advanced method is a double-up method using two welding heads, but it has to be started at the 6 o'clock position of the pipe.
On the contrary, the present invention can use two or more welding heads at the same time, thereby achieving the effect of shortening the working time, energy efficiency, and improving the worker convenience. Hereinafter, the case where the present invention is applied to pipe welding and the case where it is applied to general welding will be described separately.
As shown in FIG. 3, in the present invention, two or more welding heads 200 and 200 'can be used in pipe welding, and the traveling directions of the respective welding heads 200 and 200' proceed in the same direction. The conventional double-up method has a difference compared to the case where the two welding heads proceed in different directions.
The welding heads 200 and 200 'may be located at any two points of the pipe weld, respectively.
The
In Fig. 4, an
As shown in FIG. 2, the
The
In the above, eccentricity has been described with reference to the cross-section of the tip with reference to Fig. 4, but a tip in the form of a complete vertex having no cross-section is also included in the scope of the tip described in the present invention. In this case, the position of the vertex becomes the center B of the cross section of the tip, and is eccentrically spaced from the center A of the one end.
That is, the center of the tip herein means the position of the vertex.
On the other hand, the cross section of one end and the cross section of the tip are generally circular, in which case the center of the circle can be regarded as the center of one end and the center of the tip. In addition, a cross section can be formed in various shapes such as a polygon. In this case, the center can take center in various criteria such as momentum center.
A shape in which the other ends of the
The eccentric electrode rod may have various shapes, and the
In the present invention, the use of the
First, when the
The tip portion of the
The second case is a case where the
A case where the joint portion of the pipe is welded when the
On the other hand, a case where the
One end of the
One end of the eccentric electrode rod 300 'of the second welding head 200' is assembled to the second welding head 200 'and the other end of the electrode rod 300' . The center of the resulting tip may be eccentrically spaced from the center of the one end fixed to the second welding head 200 '.
The
At this time, each of the welding heads 200 and 200 'may further include a fixing unit (not shown) to which the eccentric electrode bars 300 and 300' are fixed.
The
The case where the present invention is used for pipe welding has been described above. Hereinafter, the present invention is extended to a general welding method. The
The first case is the case where the
The tip portion of the
The second case is a case where the
As described above, the present invention is applied to pipe welding and general welding. If necessary, the welding apparatus may specifically include two or more welding heads and corresponding electrodes.
While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.
The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.
10: piping weld
20: welding head according to the prior art
30: Electrodes according to the prior art
100: welding rail
200, 200 ': welding head
300, 300a, 300b: eccentric electrode
400: arc
500: weld bead
Claims (20)
An electrode disposed on each of the welding heads;
/ RTI >
Wherein the electrode has one end fixed to the welding head and the other end shaped like a tip machined about one end of the electrode, the center of the tip being eccentrically spaced from the center of the one end,
Each of the welding heads performing welding in the same direction, each welding head terminating welding when it reaches a welding start point of another welding head,
Wherein the two welding heads start welding at positions which are equally spaced from each other.
Wherein the electrode rod is rotated with respect to the center of the one end, and the tip forms a circular path along with rotation of the electrode rod.
Wherein the electrode rod is reciprocally rotated at a predetermined angle with respect to the center of the one end, and the tip forms an arc locus corresponding to the predetermined angle in accordance with the rotation of the electrode rod.
An electrode disposed on each of the welding heads;
/ RTI >
Wherein the electrode has one end fixed to the welding head and the other end shaped like a tip machined about one end of the electrode, the center of the tip being eccentrically spaced from the center of the one end,
The two welding heads start welding at positions which are equally spaced from each other,
Wherein the pipe welding portion corresponds to a joint between the first pipe and the second pipe, and the welding head comprises a first welding head and a second welding head, The center of the tip is eccentric and the electrode of the second welding head is eccentric to the center of the tip toward the second pipe.
Each welding head terminating welding when it reaches a point at which it starts welding.
The two welding heads start welding at positions which are equally spaced from each other,
The two welding heads proceeding from the arbitrary point of the pipe weld in the same direction to each other,
Wherein the electrode rod has one end fixed to the welding head and the other end having a shape of a tip machined around an end point of the electrode rod and the center of the tip being eccentrically spaced apart from the center of the one end, Respectively,
Each welding head terminating welding when a different welding head reaches a point at which welding begins.
And rotating the electrode with respect to the center of the one end to form a circular path along the rotation of the electrode.
Wherein the electrode is reciprocated by a predetermined angle about the center of the one end so that the tip forms an arc locus corresponding to the predetermined angle in accordance with the rotation of the electrode.
Wherein the pipe welding portion corresponds to a joint portion between the first pipe and the second pipe, the welding head comprises a first welding head and a second welding head, the first welding head includes a first electrode rod, 2 welding head includes a second electrode rod,
Wherein the first electrode rod is fixed to one side of the first welding head and the second electrode rod is fixed to one side of the second welding head, the other end of the first electrode rod is projected toward the first pipe, A second pipe projecting toward the second pipe,
A tip is formed at the other end of the first electrode rod and the second electrode rod, the center of the tip is eccentrically spaced from the center of the one end,
Wherein each of the welding heads performs welding in the same direction with each other, and wherein each welding head terminates welding when it reaches a point at which it starts welding.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US11597024B2 (en) | 2019-08-21 | 2023-03-07 | Rosemount Aerospace Inc. | Apparatus for arc welding and method of using the same |
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JP2004237326A (en) * | 2003-02-06 | 2004-08-26 | Aiko Engineering Kk | Narrow weld joint tungsten inert gas (tig) welding machine |
KR20120103429A (en) * | 2011-03-11 | 2012-09-19 | 주식회사 에치에스테크 | Learning type automatic welding device of pipes |
KR101437277B1 (en) | 2013-04-05 | 2014-09-02 | 대우조선해양 주식회사 | Device and method for orbital tig welding |
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2015
- 2015-04-07 KR KR1020150049268A patent/KR101615918B1/en active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2004237326A (en) * | 2003-02-06 | 2004-08-26 | Aiko Engineering Kk | Narrow weld joint tungsten inert gas (tig) welding machine |
KR20120103429A (en) * | 2011-03-11 | 2012-09-19 | 주식회사 에치에스테크 | Learning type automatic welding device of pipes |
KR101437277B1 (en) | 2013-04-05 | 2014-09-02 | 대우조선해양 주식회사 | Device and method for orbital tig welding |
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US11597024B2 (en) | 2019-08-21 | 2023-03-07 | Rosemount Aerospace Inc. | Apparatus for arc welding and method of using the same |
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