CN115255939A - Method for accurately assembling and welding pipeline parts - Google Patents
Method for accurately assembling and welding pipeline parts Download PDFInfo
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- CN115255939A CN115255939A CN202210647190.0A CN202210647190A CN115255939A CN 115255939 A CN115255939 A CN 115255939A CN 202210647190 A CN202210647190 A CN 202210647190A CN 115255939 A CN115255939 A CN 115255939A
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- welding
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- spigot
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/04—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention provides a method for accurately assembling and welding pipeline parts, which is characterized in that a concave spigot is formed on the machining allowance of the inner wall of a pipe fitting, and the opening direction is the welding joint end of the pipe fitting; manufacturing a positioning welding bush; installing a positioning welding bush, enabling the welding joint ends of the two pipes to be opposite, and welding the pipes at the groove; and (4) machining the inner wall of the welded pipe fitting to remove machining allowance, and removing the positioning welding bush while removing the machining allowance. The construction method can reduce the operation difficulty of workers, shorten the construction period, improve the assembly precision, ensure the welding quality, and effectively reduce the subsequent machining difficulty, and is suitable for being used as a method for accurately assembling and welding pipeline parts.
Description
Technical Field
The invention relates to the technical field of pipeline part welding, in particular to a method for accurately assembling and welding pipeline parts.
Background
In the assembling and welding construction process of the pipeline parts, the conventional construction method is to spot-weld 3-4 points at the connecting ends of the two pipeline parts, connect and relatively fix the two parts, and then weld the two parts; if the machining allowance of the inner wall and the outer wall of the pipe fitting is large, the pipe wall is thick and needs to be beveled in advance, then spot welding is carried out, and finally welding is carried out.
Aiming at the assembly and welding construction of pipeline parts with high precision requirements, because the axes of the two pipeline parts can not be accurately centered, the position relation of each section of pipeline after welding and assembling is easy to generate dislocation, and the form and position tolerance can not reach the construction inspection standard of high-precision pipeline welding connection, the welding and assembling process of the existing pipeline parts is further explained by combining figures 1 and 2, an example pipeline part is formed by butt welding three sections of a front pipe 1, a middle pipe 2 and a rear pipe 3, a root gap is required to be left at a butt joint groove 4 of the pipeline parts, and then the welding is respectively carried out at the groove 4.
In the process of implementing the technical scheme of the invention in the embodiment of the present application, the inventor of the present application finds that the above-mentioned technology has at least the following technical problems:
1. when facing to the bulky bore heavy, heavy high accuracy pipeline of weight when needing the welding, the axiality of the axis of head tube 1 and well pipe 2 is difficult to control when the butt joint, leads to the coaxial line dislocation of two pipe fittings to cause pipe fitting part dislocation deviation, and the axis that is difficult to control two pipe fittings is coaxial, and the construction degree of difficulty is great.
2. Because the groove is for no root groove and leaves the root clearance in groove department, the electric arc heat when welding can burn through the groove point end, in addition originally leaves the root clearance, can lead to in the molten steel in the molten bath flows into the pipeline by groove department, has increased the degree of difficulty of welding work, and welding quality is difficult to control, and influences the smoothness on the inner chamber wall of pipeline, can not reach the inspection standard of high accuracy pipeline, influences the use.
If the situation occurs, the construction needs to be carried out again, so that the construction period is prolonged, and financial resources are consumed.
Disclosure of Invention
The invention provides a method for accurately assembling and welding pipeline parts, which solves the technical problems of accurate assembly and welding of the pipeline parts in the prior art, particularly the assembly and welding of the pipeline parts which have high precision requirements and strict flaw detection requirements on welding seams and have no machining allowance or little machining allowance on the outer surface of a pipe fitting can realize accurate positioning during assembly of the pipeline parts, reduce the difficulty of welding operation and improve the welding quality.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for accurately assembling and welding pipeline parts comprises the steps of a, b, c, d, e, f and g;
before assembling and welding:
a. an annular first concave spigot is formed in the machining allowance of the inner wall of the welding joint end of the first pipe fitting, and the opening direction of the first concave spigot is the welding joint end of the first pipe fitting;
b. an annular second concave spigot is formed in the machining allowance of the inner wall of the welding joint end of the second pipe fitting, and the opening direction of the second concave spigot is the welding joint end of the second pipe fitting; the second concave spigot is the same as the first concave spigot in shape, and the opening directions of the second concave spigot and the first concave spigot are opposite;
c. arranging a welding groove at the end of the welding joint of the first pipe fitting and the second pipe fitting;
d. manufacturing a positioning welding bush;
the assembling process comprises the following steps:
e. installing a positioning welding bush, wherein the welding joint end of a first pipe fitting is opposite to the welding joint end of a second pipe fitting, a groove root gap is reserved between a first concave spigot and a second concave spigot and the first concave spigot and the second concave spigot are oppositely arranged to form an annular groove, the positioning welding bush is clamped in the groove by the first concave spigot and the second concave spigot, the positioning welding bush is in close fit clearance fit with the groove formed by the first concave spigot and the second concave spigot, and the first pipe fitting and the second pipe fitting are assembled by installing the positioning welding bush, so that the positioning between the first pipe fitting and the second pipe fitting is realized;
and (3) welding:
f. welding the first pipe fitting and the second pipe fitting at the groove;
and (3) completing welding:
g. the welded pipe fitting is machined to remove machining allowance, and the positioning welding bush is removed while the machining allowance is removed, so that the size and the form and position accuracy of the inner wall of the pipe fitting are guaranteed;
and d, repeating the steps a-g to finish the welding of the second pipe fitting and the third pipe fitting.
Further, the first female spigot end face is perpendicular to the axis of the first pipe fitting, and the first female spigot side wall is parallel to the axis of the first pipe fitting;
the second concave spigot end face is perpendicular to the axis of the second pipe fitting, and the second concave spigot side wall is parallel to the axis of the second pipe fitting.
Furthermore, the positioning welding bush is circular, and the two sides of the positioning welding bush are respectively and tightly attached to the first concave spigot end face and the second concave spigot end face so as to control the gap of the root of the groove.
Furthermore, the distance between the inner hole of the positioning welding bush and the outer circle is larger than the width of the first concave spigot end face and the width of the second concave spigot end face.
The positive effects are that:
according to the invention, the annular concave spigot machined on the machining allowance in the pipeline part is used, the two pipeline parts are coaxially assembled and welded through the clamping, positioning and welding bushing, the assembling precision is improved, the problem that the assembling and welding difficulty is high and the coaxial assembling cannot be ensured is solved, meanwhile, the pipeline assembling dislocation is avoided, the form and position tolerance meets the inspection standard of the high-precision pipeline assembling and welding connection, the positioning and welding bushing and the annular groove formed by the annular concave spigot on the two pipelines are oppositely assembled in a tight fit clearance mode, the excircle width of the positioning and welding bushing is larger than the root interval to play a role in supporting, molten steel in a molten pool is prevented from flowing into the pipeline, and the welding difficulty is reduced.
Drawings
FIG. 1 is a schematic view of a conventional welding assembly method for piping parts;
FIG. 2 is an enlarged view of part I of a conventional welding assembly method for piping parts;
FIG. 3 is a schematic view of the method of assembly and welding of the present invention before construction;
FIG. 4 is an enlarged partial view of method II of assembly and welding of the present invention;
FIG. 5 is a side view of the pipe before assembly and welding of the present invention;
FIG. 6 is a cross-sectional view of a tack weld bushing of the present invention;
FIG. 7 is a schematic view of a welding assembly according to an embodiment of the present invention;
FIG. 8 is an enlarged view of a portion III of the first embodiment of the present invention;
FIG. 9 is a schematic view of a second welding assembly according to an embodiment of the present invention.
In the drawing, 1, a front pipe, 2, a middle pipe, 3, a rear pipe, 4, a groove, 5, a first concave spigot, 6, a second concave spigot, 7, a positioning welding bush, 7.1, an inner hole, 7.2, an outer circle, 8, a first concave spigot end face, 9, a first concave spigot side wall, 10, a second concave spigot end face, 11, a second concave spigot side wall, 12, machining allowance, 13, flange pipe sections a and 14, a universal tee pipe section, 15, flange pipe sections b and 16, and a flange pipe section c.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
3-6, a method for accurately assembling and welding pipe parts comprises steps a, b, c, d, e, f and g;
before assembling and welding:
a. an annular first concave spigot 5 is arranged on the machining allowance 12 of the inner wall of the welding joint end of the first pipe fitting, and the opening direction of the first concave spigot 5 is the welding joint end of the first pipe fitting;
b. an annular second concave spigot 6 is arranged on the machining allowance 12 of the inner wall of the welded joint end of the second pipe fitting, and the opening direction of the second concave spigot 6 is the welded joint end of the second pipe fitting; the second concave spigot 6 is the same as the first concave spigot 5 in shape, and the opening directions are opposite;
c. arranging a welding groove at the end of the welding joint of the first pipe fitting and the second pipe fitting;
d. manufacturing a positioning welding bush 7;
the assembling process comprises the following steps:
e. installing a positioning welding bush 7, wherein the welding joint end of a first pipe fitting is opposite to the welding joint end of a second pipe fitting, a groove root gap is reserved between the first female spigot 5 and the second female spigot 6 and the first female spigot 5 and the second female spigot 6 are oppositely arranged to form an annular groove, the positioning welding bush 7 is clamped in the groove by the first female spigot 5 and the second female spigot 6, the axis of the positioning welding bush 7 is coaxial with the axes of the two pipe fittings, the positioning welding bush 7 is in close fit clearance fit with the groove formed by the first female spigot 5 and the second female spigot 6, and the first pipe fitting and the second pipe fitting are assembled by installing the positioning welding bush 7, so that the coaxial positioning between the first pipe fitting and the second pipe fitting is realized;
and (3) welding:
f. welding the first pipe fitting and the second pipe fitting at the groove;
and (3) completing welding:
g. the welded pipe fitting is machined to remove machining allowance 12, the positioning welding bush 7 is removed while the machining allowance 12 is removed, and the size and the form and position accuracy of the inner wall of the pipe fitting are guaranteed;
and d, repeating the steps a-g to finish the welding of the second pipe fitting and the third pipe fitting.
Further, the first female spigot end surface 8 is perpendicular to the axis of the first pipe, and the first female spigot side wall 9 is parallel to the axis of the first pipe;
the second female end face 10 is perpendicular to the axis of the second pipe, and the second female end side wall 11 is parallel to the axis of the second pipe.
Furthermore, the positioning welding bush 7 is circular, and the two sides of the positioning welding bush 7 are respectively and tightly attached to the first concave spigot end face 8 and the second concave spigot end face 10 so as to control the gap of the root of the groove.
Further, the distance between the inner hole 7.1 and the outer circle 7.2 of the positioning welding bush 7 is larger than the width of the first concave spigot end face 8 and the width of the second concave spigot end face 10.
The first embodiment is as follows:
according to fig. 7 and 8, before assembly and welding, a concave spigot with an open end is formed on the inner machining allowance 12 of the to-be-welded ends of the front pipe 1, the middle pipe 2 and the rear pipe 3 respectively, and a welding bevel 4 is formed at the same time;
then two annular positioning welding bushes 7 are manufactured according to the size of the machined female spigot, the positioning welding bushes 7 are respectively installed in the pre-installed female spigot of the front pipe 1, the middle pipe 2 and the rear pipe 3, annular grooves formed by the annular female spigots on the two pipes are in close fit and clearance fit with the positioning welding bushes 7, the axis of the positioning welding bushes 7 is coaxial with the axis of the two pipes, and the coaxial assembly among the front pipe 1, the middle pipe 2 and the rear pipe 3 is completed through the positioning welding bushes 7; avoiding the pipeline assembly dislocation and ensuring that the form and position tolerance meets the inspection standard of high-precision pipeline assembly welding connection.
And then, welding is finished at the groove, because the positioning welding bush 7 is opposite to the annular groove formed by the annular concave rabbets on the two pipelines, and the width of the outer end surface of the positioning welding bush 7 can control the distance between the root parts of the grooves, meanwhile, molten steel in the molten pool can be prevented from flowing into the pipeline, the inner wall of the pipeline is ensured to be smooth, and the welding difficulty is reduced.
And finally, removing machining allowance in the pipeline through machining, and removing the positioning welding bush 7 at the same time to finish accurate positioning and welding of the pipeline.
Example two:
referring to fig. 9, first, a female spigot is machined on the machining allowance 12 in the universal three-way pipe section 14, the flange pipe section a13, the flange pipe section b15 and the flange pipe section c16, and the welding bevel 4 is machined at the same time;
then, manufacturing an annular positioning welding bush 7 according to the size of the machined female spigot, enabling an outer circle 7.2 of the annular positioning welding bush to be tightly matched with the female spigot in the pipeline, enabling the axis of the positioning welding bush 7 to be coaxial with the axis of the pipeline connected with the positioning welding bush to realize coaxial positioning assembly, and enabling the width of the outer end face of the positioning welding bush 7 to determine the root gap of the groove;
secondly, welding the pipeline which is coaxially positioned and assembled through the positioning welding bush 7 at the groove;
and finally, removing machining allowance in the pipeline through machining, and removing the positioning welding bush 7 at the same time to complete pipeline welding.
The invention has the advantages that:
the construction method of the invention only needs to leave a small amount of machining allowance on the single side of the inner surface of the sample part, and the outer surface can be selected to leave no allowance or little mechanical allowance according to the precision requirement of the workpiece.
The assembly precision between the pipeline pieces can be controlled through the precision of the positioning welding bush, the positioning welding bush can play a role in supporting during welding, molten steel in the welding process is prevented from flowing into a pipeline at the root gap of the groove, the welding difficulty is reduced, and the welding quality can be controlled.
After welding, the machining allowance in the pipeline is machined through a machining method to finish a finished product, and the inner hole allowance and the positioning welding bush can be removed together during machining, so that the size precision of the product is guaranteed, and the structural form of the product is not affected.
The invention can be slightly changed in structure and size to solve the problems of accurate assembly and optimized welding of pipeline parts
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (4)
1. A method for accurately assembling and welding pipeline parts is characterized in that: comprises a step a, a step b, a step c, a step d, a step e, a step f and a step g;
before assembling and welding:
a. an annular first concave spigot is formed in the machining allowance of the inner wall of the welding joint end of the first pipe fitting, and the opening direction of the first concave spigot is the welding joint end of the first pipe fitting;
b. an annular second concave spigot is formed in the machining allowance of the inner wall of the welding joint end of the second pipe fitting, and the opening direction of the second concave spigot is the welding joint end of the second pipe fitting; the second concave seam allowance is the same as the first concave seam allowance in shape, and the opening directions of the second concave seam allowance and the first concave seam allowance are opposite;
c. arranging a welding groove at the end of the welding joint of the first pipe fitting and the second pipe fitting;
d. manufacturing a positioning welding bush;
the assembling process comprises the following steps:
e. installing a positioning welding bush, wherein the welding joint end of a first pipe fitting is opposite to the welding joint end of a second pipe fitting, a groove root gap is reserved between a first female spigot and a second female spigot and the first female spigot and the second female spigot are oppositely arranged to form an annular groove, the positioning welding bush is clamped in the groove by the first female spigot and the second female spigot, so that the axis of the positioning welding bush is coaxial with the axes of the two pipe fittings, the positioning welding bush is in close fit clearance fit with the groove formed by the first female spigot and the second female spigot, the assembly of the first pipe fitting and the second pipe fitting is completed by installing the positioning welding bush, and the coaxial positioning between the first pipe fitting and the second pipe fitting is realized;
and (3) welding:
f. welding the first pipe fitting and the second pipe fitting at the groove;
and (3) completing welding:
g. machining the inner wall of the welded pipe fitting to remove machining allowance, and removing the positioning welding bush while removing the machining allowance so as to ensure the size and the form and position precision of the inner wall of the pipe fitting;
and d, repeating the steps a-g to finish the welding of the second pipe fitting and the third pipe fitting.
2. The method for accurately assembling and welding pipe type components according to claim 1, wherein the method comprises the following steps:
the first concave spigot end face is perpendicular to the axis of the first pipe fitting, and the first concave spigot side wall is parallel to the axis of the first pipe fitting;
the second female spigot end face is perpendicular to the axis of the second pipe fitting, and the second female spigot side wall is parallel to the axis of the second pipe fitting.
3. The method for precisely assembling and welding pipe type components according to claim 1, wherein:
the fixed-position welding bush is circular, and the two sides of the fixed-position welding bush are respectively and tightly attached to the first concave spigot end face and the second concave spigot end face so as to control the gap of the root of the groove.
4. A method of accurately assembling and welding pipe components as claimed in claim 3, wherein:
the distance between the inner hole of the positioning welding bush and the outer circle is larger than the width of the first concave spigot end face and the width of the second concave spigot end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210647190.0A CN115255939A (en) | 2022-06-09 | 2022-06-09 | Method for accurately assembling and welding pipeline parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210647190.0A CN115255939A (en) | 2022-06-09 | 2022-06-09 | Method for accurately assembling and welding pipeline parts |
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| Publication Number | Publication Date |
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| CN115255939A true CN115255939A (en) | 2022-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210647190.0A Pending CN115255939A (en) | 2022-06-09 | 2022-06-09 | Method for accurately assembling and welding pipeline parts |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102303178A (en) * | 2011-07-28 | 2012-01-04 | 四川电力建设三公司 | Semi-automatic gas shield welding construction technology for aluminum conductors |
| CN102554484A (en) * | 2012-01-11 | 2012-07-11 | 阮继成 | Metal pipe welding method and metal pipe welding assembly |
| CN107127470A (en) * | 2017-06-30 | 2017-09-05 | 北京首钢建设集团有限公司 | A kind of interface uses the pipe installation method for welding cage plate |
| CN110977215A (en) * | 2019-11-07 | 2020-04-10 | 鞍钢重型机械有限责任公司 | Cylinder body butt joint back chipping-free weld joint pretreatment process |
| CN112658443A (en) * | 2020-12-17 | 2021-04-16 | 江苏利柏特股份有限公司 | Manual argon tungsten-arc welding process method for steel-aluminum connector |
-
2022
- 2022-06-09 CN CN202210647190.0A patent/CN115255939A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102303178A (en) * | 2011-07-28 | 2012-01-04 | 四川电力建设三公司 | Semi-automatic gas shield welding construction technology for aluminum conductors |
| CN102554484A (en) * | 2012-01-11 | 2012-07-11 | 阮继成 | Metal pipe welding method and metal pipe welding assembly |
| CN107127470A (en) * | 2017-06-30 | 2017-09-05 | 北京首钢建设集团有限公司 | A kind of interface uses the pipe installation method for welding cage plate |
| CN110977215A (en) * | 2019-11-07 | 2020-04-10 | 鞍钢重型机械有限责任公司 | Cylinder body butt joint back chipping-free weld joint pretreatment process |
| CN112658443A (en) * | 2020-12-17 | 2021-04-16 | 江苏利柏特股份有限公司 | Manual argon tungsten-arc welding process method for steel-aluminum connector |
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