CN114769921A - Method for processing composite pipe by composite coiled plate through high-frequency electric welding and surfacing - Google Patents
Method for processing composite pipe by composite coiled plate through high-frequency electric welding and surfacing Download PDFInfo
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- CN114769921A CN114769921A CN202210323613.3A CN202210323613A CN114769921A CN 114769921 A CN114769921 A CN 114769921A CN 202210323613 A CN202210323613 A CN 202210323613A CN 114769921 A CN114769921 A CN 114769921A
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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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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Abstract
The invention belongs to a method for processing a composite pipe, and aims to solve the technical problems that when the existing composite pipe is mechanically assembled, a lining pipe often bulges or collapses, a welding mode is adopted, and the bonding strength of a liner pipe and a base pipe is difficult to ensure.
Description
Technical Field
The invention belongs to a method for processing a composite pipe, and particularly relates to a method for processing a composite coiled plate into a composite pipe through high-frequency electric welding and surfacing.
Background
In many production environments, it is desirable to support highly corrosive media within the pipe, such as those used in sour field development. Although a proper stainless steel material is selected to resist the corrosion of the medium, if pure stainless steel pipes are adopted, the production cost is greatly improved, in this case, a composite pipe or a lining bimetal stainless steel composite pipe is selected to be a more reasonable choice, and the composite pipe or the lining bimetal stainless steel composite pipe takes the corrosion resistance of the stainless steel pipe and the bearing capacity of the carbon steel pipe into consideration, and the price advantage of the carbon steel pipe into consideration, so that the production cost can be greatly reduced.
At present, mechanical assembly is adopted between a liner pipe and a base pipe of a composite pipe, the phenomenon that the liner pipe bulges or collapses frequently occurs in the composite pipe, the use reliability of the liner pipe is influenced, and even if a welding mode is adopted, the bonding strength of the liner pipe and the base pipe is difficult to ensure.
Disclosure of Invention
The invention provides a method for processing a composite coil into a composite pipe through high-frequency electric welding and surfacing, aiming at solving the technical problems that when the existing composite pipe is mechanically assembled, an inner lining pipe often bulges or collapses, and the combination strength of a liner pipe and a base pipe is difficult to ensure by adopting a welding mode.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a method for processing a composite pipe by a composite coiled plate through high-frequency electric welding and surfacing is characterized by comprising the following steps:
s1, processing the composite coiled plate into a steel pipe
S1.1, machining plate edges or grooves after uncoiling and leveling the composite coiled plate, and removing an alloy lining layer of the plate edges to obtain an uncoiled coiled plate;
s1.2, processing the flattened coil plate into an open steel pipe through a roller way;
s1.3, welding the opening of the opened steel pipe in a high-frequency resistance welding and induction welding mode, scraping welding flashes and welding burrs on the inner surface and the outer surface, enabling the welding seam of the outer surface to be flush with the outer surface of the steel pipe, and enabling the welding seam of the inner surface to be flush with the base and lining bonding surface in the inner surface of the steel pipe;
s1.4, performing medium-frequency induction heating treatment on the welding seams of the high-frequency resistance welding and the induction welding in the step S1.3, and then cutting the steel pipe into specified lengths to obtain a plurality of sections of steel pipes;
s1.5, respectively enabling the welding seams of the multi-section steel pipes obtained in the step S1.4 to be upwards positioned at a 12 o' clock position, carrying out a hydraulic strength test and a sealing test on the multi-section steel pipes, controlling the water content after the test, executing the step S2 if the test is qualified, and otherwise, rejecting the steel pipes which are unqualified in the test;
s2, performing surfacing repair welding on the inner welding channel of the alloy lining on the inner surface of the steel pipe to obtain the composite pipe
S2.1, cleaning and drying the inner surface of the steel pipe qualified in the test of the step S1.5;
s2.2, adopting a welding material matched with the inner surface alloy lining to carry out full-pipe-length overlaying repair welding on the inner weld of the inner surface alloy lining of the steel pipe to obtain a composite pipe with a complete inner surface;
s3, checking the strength of the composite pipe and the inner welding channel of the alloy lining layer, if the check meets the preset requirements, executing the step S4, otherwise, checking the steel pipe again, reworking and repairing or rejecting the steel pipe;
and S4, performing pipe end machining on the composite pipe to finish the machining of the composite pipe.
Further, in step S1.1, the alloy lining on the plate edge is removed, specifically, the alloy lining with a width of 2-6mm on the plate edge is removed.
Further, in step S2.2, the performing of the surfacing repair welding specifically includes:
the method comprises the steps of additionally installing arc striking and extinguishing plates at welding seams at two ends of a steel pipe through welding, rotating the welding seams to the direction of six o' clock, then extending an inner welding machine head into the steel pipe, carrying out no-load and simulating the traveling path during welding, checking and confirming the straightness of the welding seams and the centering and tracking conditions of the inner welding machine head and the welding seams, carrying out overlaying repair welding if preset requirements are met, cutting off the arc striking and extinguishing plates after the welding is finished, otherwise, adjusting the inner welding machine until the preset requirements are met, carrying out overlaying repair welding, and cutting off the arc striking and extinguishing plates after the welding is finished.
Further, in step S2.2, the build-up welding is performed by any one of CMT, submerged arc welding, flux-cored wire plus shielding gas, MIG, and TIG.
Further, in step S3, the inspecting the strength of the composite pipe and the inner weld of the alloy lining layer specifically includes:
and carrying out hydraulic pressure strength inspection on the composite pipe, and carrying out appearance inspection, penetration inspection and X-ray inspection on the inner welding channel of the alloy lining layer.
Further, step S4 is specifically:
and (3) processing a groove of the base pipe where the base material is positioned in the composite pipe, and simultaneously exposing the pipe end of the liner pipe where the alloy lining layer is positioned.
Further, S1.1-2 is included between the step S1.1 and the step S1.2, flaw detection is carried out on the flattened coil, defects found by flaw detection are recorded and tracing evaluation is carried out, if the evaluation meets preset qualified conditions, the step S1.2 is executed, and otherwise, the flattened coil is removed;
and S1.6 is also included between the step S1.5 and the step S2, after the medium-frequency induction heating treatment, the steel pipe body and the welding seam are cooled to room temperature, flaw detection is carried out on the steel pipe body and the welding seam, the defects found by the flaw detection are recorded and traced and evaluated, if the evaluation meets the preset qualified conditions, the step S2.1 is executed, otherwise, the steel pipe is rejected.
Further, in step S1.1-2, the flattened coil is subjected to flaw detection, specifically, by visual inspection evaluation of appearance, and/or UT ultrasonic inspection, and/or X-ray radiographic inspection;
in step S1.6, the flaw detection of the steel pipe body and the weld joint is specifically performed by visual inspection evaluation of appearance, and/or UT ultrasonic inspection, and/or X-ray radiographic inspection.
Compared with the prior art, the invention has the following beneficial effects:
1. the composite coiled plate is formed and welded into the composite tube by using the existing high-frequency welded tube production line and adopting the high-frequency resistance welding and induction welding modes by adopting the method for processing the composite tube by using the composite coiled plate as the raw material through high-frequency electric welding and surfacing welding, and then the surfacing welding repair welding is carried out on the inner welding channel of the composite tube, so that the integrity of the inner alloy lining layer is ensured, the composite tube can realize good comprehensive performance, and can be widely and safely used in special requirements such as high corrosivity and the like. Meanwhile, the processing method is convenient and fast to process and low in implementation cost.
2. According to the method for processing the composite pipe, the alloy lining layer on the edge of the plate is removed before the steel pipe with the opening is processed through the roller way, the flash and the burr formed after high-frequency resistance welding and induction welding are only the flash and the burr formed during the welding of the base material, the alloy lining layer does not participate in the welding or the welding flash and the welding burr are formed, the width sizes of the formed welding flash and the welding burr are small, and the scraping is convenient. In addition, only flash and burrs formed during welding of the base material are scraped, the binding force between the alloy lining layer and the base material of the scraped part is not affected or reduced, and the welding performance of the composite pipe is effectively guaranteed.
3. The invention adopts any one of CMT, submerged arc welding, flux-cored wire and protective gas, MIG or TIG to carry out surfacing repair welding, thereby ensuring the integrity of the repaired internal alloy lining.
4. According to the invention, after welding, the hydraulic strength of the composite pipe and the condition of the inner welding channel are checked, so that the welding quality is ensured.
5. In the invention, the pipe end of the composite pipe is processed finally, so that the liner pipe with the alloy lining layer is exposed out of the pipe end, thereby facilitating the connection between the adjacent composite pipes.
Drawings
FIG. 1 is a schematic view of a leveled composite rolled sheet without removing the alloy lining of the sheet edges;
FIG. 2 is a schematic view of a leveled composite rolled sheet with the alloy lining of the sheet edges removed;
FIG. 3 is a schematic view of an open-ended steel pipe without removing the plate edge alloy lining;
FIG. 4 is a schematic view of an open-ended steel pipe with an alloy lining on the edge of the plate removed;
FIG. 5 is a schematic view of weld joint flash and burr after high-frequency resistance welding and induction welding of an open-ended steel pipe without removing an alloy lining layer at a plate edge;
FIG. 6 is a schematic view of weld joint flash and burr after high-frequency resistance welding and induction welding of the open-ended steel pipe with the plate edge alloy lining removed;
FIG. 7 is a schematic view of an open-ended steel pipe without the alloy lining layer on the edge of the plate removed after flash and burr removal by high-frequency resistance welding and induction welding;
FIG. 8 is a schematic view of an open-ended steel pipe with an alloy lining layer removed at the edge of the pipe, after flash and burr are removed by welding seams of high-frequency resistance welding and induction welding;
FIG. 9 is a schematic view of a build-up layer after the build-up welding repair of the inner weld of the alloy lining layer;
figure 10 is a schematic end view of a composite pipe after end machining (only the end side wall is shown).
Wherein: 1-substrate, 2-alloy lining and 3-surfacing layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
The invention provides a method for processing a composite pipe by a composite coiled plate through high-frequency electric welding and surfacing welding, which adopts the composite coiled plate (Clad plate, metallurgical bonding) as a raw material and welds the composite coiled plate into the composite pipe through high-frequency resistance welding and induction welding, so that the composite pipe has good comprehensive performance and is used in environments with special requirements on corrosion resistance and the like.
The specific processing method comprises the following steps:
firstly, the welding produces the interior alloy steel pipe that covers that can guarantee base pipe welding seam quality, and the interior alloy steel pipe that covers who obtains, its interior alloy layer that covers is not welded, perhaps even welded, has also scraped the welding seam of interior alloy layer, and concrete operation is as follows:
1.1, uncoiling and leveling the composite coiled plate, processing the plate edge or the groove by milling or other methods, and removing the alloy lining layer in a smaller range (such as the width of a single edge of 2-6 mm) of the plate edge while processing the plate edge or the groove by milling or other methods. FIG. 1 shows the composite rolled sheet without the edge alloy lining removed (leveled), and FIG. 2 shows the composite rolled sheet with the edge alloy lining removed (leveled).
1.2, flaw detection is carried out on the rolled plate flattened in the step 1.1 by adopting visual inspection evaluation, ultrasonic inspection, X-ray shooting inspection or other flaw detection methods, recording and tracing evaluation are carried out on the defects of the rolled plate found in the flaw detection, if the defects are qualified, the step 1.3 is continuously executed, and if the defects are not qualified, the defects are eliminated.
And 1.3, processing the rolled plate flattened by flaw detection into an open steel pipe through a roller way. FIGS. 3 and 4 are schematic views of an open ended steel pipe without the plate edge alloy lining removed and with the plate edge alloy lining removed, respectively.
1.4, will process into open-ended steel pipe, weld opening department through the mode of high-frequency resistance welding and induction welding, strike off welding flash and the welding burr of welding back steel pipe internal surface and surface immediately after the welding, strike off after surface welding flash and the welding burr, the surface welding seam flushes with the steel pipe surface, strikes off after internal surface welding flash and the welding burr, the base pipe welding seam internal surface flushes in base pipe and bushing pipe faying surface. Because the alloy lining layer with a smaller range of the plate edge is removed in the step 1.1, the flash and the burr formed by welding are only the flash and the burr formed during the welding of the base material, the lining layer does not participate in the welding, and the welding flash and the burr are not formed, so that the formed welding flash and the burr have small width and are convenient to scrape. Meanwhile, only the flash and the burr formed during the welding of the base material are scraped, the binding force of the lining base material at the scraping part cannot be influenced or reduced, for example, the original binding strength and the shearing strength of the coiled plate base material and the lining are 350MPa, the welding seam formed by welding after the lining of the plate edge is removed, and the binding strength and the shearing strength of the base material and the lining near the welding seam can still keep 350 MPa. However, if the weld seam formed by welding without removing the plate edge lining in step 1.1, when the welding flash and the welding burr are scraped off in this step, the scraped flash and burr are the flash and burr with larger width formed by the substrate and the lining together, except that the flash and burr with large width are difficult to scrape, the temperature is higher when the burr is scraped, the relative 'sliding' of the local substrate and the lining at the burr scraping position can be caused, finally the bonding strength and the shearing strength of the local substrate and the lining are scraped by the burr after the burr is scraped are reduced, for example, the bonding strength and the shearing strength are reduced from 350MPa of the original bonding strength and the shearing strength of the rolled plate substrate and the lining to 250MPa, even the local lining can be separated from the substrate and tilted, in the subsequent overlaying welding repair welding process of the weld joint of the steel pipe, the weld joint is difficult to repair, so that the bonding strength or the shearing strength of the base material and the lining layer in the local area of the weld joint in the finished steel pipe is lower than that of other pipe body parts. If the alloy lining layer in a smaller range of the plate edge is not removed before, after the fins and burrs formed by the inner surface base material and the alloy lining layer are scraped, the alloy lining layer can be flush with the joint surface of the base material and the lining pipe, or can be higher than the joint surface of the base material and the lining pipe, but the alloy lining layer and the base material at the position are ensured to be tightly and metallurgically bonded. FIGS. 5 and 6 are schematic diagrams of flash and burr at the weld joint of the open-ended steel pipe obtained by removing the plate edge alloy lining layer and the plate edge alloy lining layer after high-frequency resistance welding and induction welding, respectively. Fig. 7 is a schematic view of fig. 5 after removing flash and burrs, and fig. 8 is a schematic view of fig. 6 after removing flash and burrs.
1.5, carrying out heat treatment on the welding seam part of the high-frequency resistance welding or the induction welding by a medium-frequency induction heating heat treatment machine, wherein the heat treatment is generally normalizing treatment or quenching and tempering treatment, and the normalizing (normalizing treatment) or quenching and tempering treatment process parameters are mainly determined according to the base carbon steel material.
1.6, cutting the steel pipes produced continuously, wherein the cut length is generally 12m, performing a hydraulic strength and tightness test on the cut 12m steel pipes with the welding seams facing upwards at a 12 o' clock position, and performing surfacing welding on the welding seams of the coating in the alloy of the whole steel pipe, wherein the test is passed, the next step can be performed, and otherwise, unqualified steel pipes are removed.
And 1.7, carrying out flaw detection on the steel pipe body and the welding seam from outside by adopting visual inspection evaluation, ultrasonic inspection, X-ray shooting inspection or other flaw detection methods, recording and tracing and evaluating the defects found during flaw detection, if the defects are qualified, continuing to execute the next step, and if the defects are not qualified, rejecting the steel pipe.
In addition, a pipe section for performing a steel pipe physical and chemical performance test may be cut out, and a pipe section processed sample may be subjected to a physical and chemical performance test. And carrying out unique identification on the steel pipe.
And secondly, surfacing and repair welding are carried out on the inner welding channel of the alloy lining layer on the inner surface of the composite pipe.
If the alloy lining layer in a smaller range of the plate edge is not removed in the first step, and after flash and burrs formed by the inner surface base material and the alloy lining layer are scraped, the welding seam is still higher than the joint surface of the base material and/or the lining layer, the inner welding channel with the length of 90mm (or the length is determined according to specific project conditions) at the two ends of the composite pipe, with the wall thickness of the inner surface lining layer pipe being about 8mm, is repaired and ground (the aim of polishing the position is to ensure that the thickness of the inner welding channel surfacing layer at the pipe end part is larger after the next step of surfacing welding the inner welding channel, the joint strength of the surfacing layer of the inner welding channel and the base material is higher, and the joint surface between the surfacing part and the outer layer base pipe is positioned on the same circle with the lining layer and the base material joint surface at the rest part, so that the subsequent assembly welding of the liner pipe and the liner pipe is facilitated.
The specific method for surfacing and repair welding comprises the following steps: and cleaning and drying the inner surface of the steel pipe by adopting hot steam, hot air blowing or other modes, and additionally installing arc striking and extinguishing plates at the welding seams at the two ends of the cut steel pipe by welding. And (3) turning the welding seam of the steel pipe to a 6 o' clock position, deeply inserting the head of the inner welding machine into the welding pipe, and checking the straightness of the welding seam and the centering and tracking condition of the head of the welding machine on the welding seam in a no-load and simulated welding process. And performing overlaying repair welding on the welding seam at the alloy lining layer by the welding machine under the condition that the straightness of the welding seam and the centering tracking condition of the welding seam by the welding machine head are checked to be qualified. And cutting off arc striking and extinguishing plates at two ends of the steel pipe after surfacing. Fig. 9 is a schematic view of a weld overlay 3 of the alloy backing layer 2 after completion of the weld overlay repair weld.
During the overlaying repair Welding, the overlaying repair Welding can be carried out on the inner weld bead in a CMT (Cold Metal Transfer) mode, a submerged arc Welding mode, a flux-cored wire and shielding Gas mode, a MIG (Metal Inert-Gas Welding) mode or a TIG (Tungsten Inert-Gas Welding) mode. If the inner weld channels of the wall thickness of the lining pipe with the width of about 8mm and the length of 90mm (or the length is determined according to the specific project condition) at the two ends of the composite pipe are repaired and ground, the surfacing speed needs to be reduced for surfacing at the positions of the inner weld channels at the two ends, and the sufficient thickness of the surfacing layer at the positions is ensured.
And thirdly, performing inspection and strength test on the composite pipe obtained after overlaying repair welding, including appearance inspection on an overlaying inner welding bead of the composite pipe, penetration inspection on the overlaying inner welding bead, X-ray inspection on the overlaying inner welding bead and water pressure strength test on the composite pipe.
Fourthly, processing the pipe end of the composite pipe: referring to fig. 10, a groove of a substrate tube is prepared while exposing the inner alloy lining to the end of the tube for butt welding with other tubes.
The composite pipe processed by the method can be used in special environments with high corrosivity and the like.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for processing a composite pipe by a composite coiled plate through high-frequency electric welding and surfacing is characterized by comprising the following steps:
s1, processing the composite coiled plate into a steel pipe
S1.1, processing plate edges or grooves after uncoiling and leveling the composite coiled plate, and removing an alloy lining layer of the plate edges to obtain a flattened coiled plate;
s1.2, processing the flattened coil plate into an open steel pipe through a roller way;
s1.3, welding the opening of the open steel pipe in a high-frequency resistance welding and induction welding mode, scraping welding burrs and welding burrs on the inner surface and the outer surface, enabling the welding seam of the outer surface to be flush with the outer surface of the steel pipe, and enabling the welding seam of the inner surface to be flush with the base and lining bonding surface in the inner surface of the steel pipe;
s1.4, performing medium-frequency induction heating treatment on the welding seams of the high-frequency resistance welding and the induction welding in the step S1.3, and then cutting the steel pipe into specified lengths to obtain a plurality of sections of steel pipes;
s1.5, respectively enabling the multi-section steel pipe welding seam obtained in the step S1.4 to be upwards positioned at a 12 o' clock position, carrying out a hydraulic pressure strength test and a sealing test on the multi-section steel pipe, controlling water content after the test, executing the step S2 if the test is qualified, and otherwise, removing the steel pipe which is unqualified in the test;
s2, performing surfacing repair welding on the inner welding channel of the alloy lining on the inner surface of the steel pipe to obtain the composite pipe
S2.1, cleaning and drying the inner surface of the steel pipe qualified in the test of the step S1.5;
s2.2, adopting a welding material matched with the inner surface alloy lining to carry out full-pipe-length overlaying repair welding on the inner weld of the inner surface alloy lining of the steel pipe to obtain a composite pipe with a complete inner surface;
s3, checking the strength of the composite pipe and the inner welding channel of the alloy lining layer, if the check meets the preset requirements, executing the step S4, otherwise, checking the steel pipe again, reworking and repairing or rejecting the steel pipe;
and S4, performing pipe end machining on the composite pipe to finish machining of the composite pipe.
2. The method for processing the composite pipe by the high-frequency electric welding and overlaying welding of the composite coiled plate according to claim 1, wherein in the step S1.1, the alloy lining on the plate edge is removed, specifically, the alloy lining with the width of 2-6mm on the plate edge is removed.
3. The method for processing the composite coiled plate into the composite pipe through high-frequency electric welding and overlaying welding according to claim 1 or 2, wherein in the step S2.2, the overlaying welding and overlaying welding specifically comprises the following steps:
the method comprises the steps of additionally installing leading and extinguishing plates at welding seams at two ends of a steel pipe through welding, rotating the welding seams to the six-o' clock direction, then extending an inner welding machine head into the steel pipe, carrying out no-load and simulating a traveling path during welding, checking and confirming the straightness of the welding seams, and checking and confirming the centering and tracking conditions of the inner welding machine head and the welding seams, if preset requirements are met, carrying out overlaying repair welding, cutting the leading and extinguishing plates after the welding is completed, otherwise, adjusting the inner welding machine until the preset requirements are met, carrying out overlaying repair welding, and cutting the leading and extinguishing plates after the welding is completed.
4. The method for processing the composite coiled plate into the composite pipe through high-frequency electric welding and overlaying welding according to claim 3, wherein in the step S2.2, overlaying welding and overlaying welding are carried out in any mode of CMT, submerged arc welding, flux-cored wire and protective gas, MIG or TIG.
5. The method for processing the composite coiled plate into the composite tube through high-frequency electric welding and overlaying welding according to claim 4, wherein in the step S3, the checking on the strength of the composite tube and the inner welding channel of the alloy lining layer comprises the following specific steps:
and carrying out hydraulic strength inspection on the composite pipe, and carrying out appearance inspection, penetration inspection and X-ray inspection on the inner welding channel of the alloy lining.
6. The method for processing the composite coiled plate into the composite pipe through high-frequency electric welding and overlaying welding according to claim 5, wherein the step S4 is specifically as follows:
and (3) processing a groove of the base pipe where the base material is positioned in the composite pipe, and simultaneously exposing the pipe end of the liner pipe where the alloy lining layer is positioned.
7. The method for processing the composite pipe by the composite coiled plate through the high-frequency electric welding and overlaying welding according to claim 6, wherein the method comprises the following steps:
s1.1-2 is also included between the step S1.1 and the step S1.2, flaw detection is carried out on the flattened coil, the defects found by flaw detection are recorded, tracking evaluation is carried out, if the evaluation meets the preset qualified conditions, the step S1.2 is executed, and otherwise, the flattened coil is removed;
and S1.6 is also included between the step S1.5 and the step S2.1, after the medium-frequency induction heating treatment, the steel pipe body and the welding line are cooled to room temperature, flaw detection is carried out on the steel pipe body and the welding line, the defects found by the flaw detection are recorded, tracing and evaluation are carried out, if the evaluation meets the preset qualified conditions, the step S2.1 is executed, and otherwise, the steel pipe is removed.
8. The method for processing the composite pipe by the composite coiled plate through the high-frequency electric welding and overlaying welding according to claim 6, wherein the method comprises the following steps: in the step S1.1-2, flaw detection is carried out on the flattened rolled plate, specifically, visual inspection evaluation and/or UT ultrasonic inspection and/or X-ray shooting inspection are carried out on the appearance;
in step S1.6, the flaw detection of the steel pipe body and the weld joint is specifically performed by visual inspection evaluation of appearance, and/or UT ultrasonic inspection, and/or X-ray radiographic inspection.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117961446A (en) * | 2024-03-28 | 2024-05-03 | 河北汇中管道装备有限公司 | Bimetal composite pipe fitting and preparation method thereof |
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| JPH01224179A (en) * | 1988-03-04 | 1989-09-07 | Nkk Corp | Manufacture of clad welded steel pipe |
| CN103612020A (en) * | 2013-12-10 | 2014-03-05 | 北京隆盛泰科石油管科技有限公司 | Method for producing composite pipes by adopting composite steel plates in electric resistance welding and surfacing modes |
| US20200001339A1 (en) * | 2017-03-27 | 2020-01-02 | Baoshan Iron & Steel Co., Ltd. | Method for manufacturing clad steel pipe |
| CN210231873U (en) * | 2019-06-21 | 2020-04-03 | 中国石油集团工程股份有限公司 | Heavy-calibre bimetal metallurgy composite pipe |
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| JPH01224179A (en) * | 1988-03-04 | 1989-09-07 | Nkk Corp | Manufacture of clad welded steel pipe |
| CN103612020A (en) * | 2013-12-10 | 2014-03-05 | 北京隆盛泰科石油管科技有限公司 | Method for producing composite pipes by adopting composite steel plates in electric resistance welding and surfacing modes |
| US20200001339A1 (en) * | 2017-03-27 | 2020-01-02 | Baoshan Iron & Steel Co., Ltd. | Method for manufacturing clad steel pipe |
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