CN101559549A - Process method for rewelding of high strength steel - Google Patents
Process method for rewelding of high strength steel Download PDFInfo
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- CN101559549A CN101559549A CNA2009103025739A CN200910302573A CN101559549A CN 101559549 A CN101559549 A CN 101559549A CN A2009103025739 A CNA2009103025739 A CN A2009103025739A CN 200910302573 A CN200910302573 A CN 200910302573A CN 101559549 A CN101559549 A CN 101559549A
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Abstract
The invention relates to the field of rewelding technology of high strength steel and provides a process method for rewelding of high strength steels. The process method comprises the following working steps of firstly heating to a lower pre-heating temperature within a larger range at a welding groove, suitably reducing the temperature gradients and additive stress of the component, subsequently when in welding, heating centrally and continuously within a small range at the positions corresponding to the back surface of the welding positions simultaneously, and maintaining local high pre-heating temperature before welding. The process method can effectively improve the heat utilization ratio of weld pre-heating of the large thickness plate steel components, save the energy resource and improve the rewelding quality and production efficiency.
Description
Technical field
The present invention relates to the high-strength steel welding technology field, particularly high-strength steel reprocesses welding technique.
Background technology
High-strength steel welding needs weld preheating usually, to improve the Thermal Cycle condition, prevents the generation of weld crack, and required preheat temperature depends on factors such as the chemical composition, joint constraint (restraint) degree, welding manner, environment temperature of mother metal.Particularly in the rewelding of high-strength steel, because the suffered three-dimensional stress effect of weld seam, constraint (restraint) degree is big, needs than the higher preheat temperature of normal product welding.
According to related specifications, high-strength steel rewelding preheat temperature is required to be about 200 ℃, make big slab high-strength steel structural member reprocess weld metal zone long period stable maintenance about 200 ℃, just need be to fully be heated to required preheat temperature in the enough big zone of weldering member comprehensively, could effectively check heat conduction fast, can bring inefficiency like this, problems such as poor working environment, especially at outdoor construction, when environment temperature was low, cooling velocity was very fast, and pre-heat effect is poor, flame heat point transient temperature can reach the preheat temperature requirement, and after withdrawing thermal source and counting the branch kind, this regional temperature is promptly reduced to and is required below the preheat temperature, and weld preheating work is more difficult.
Summary of the invention
Technical problem to be solved by this invention provides a kind of high-strength steel welding process, improves the capacity usage ratio of big slab high-strength steel member weld preheating effectively, improves rewelding quality and production efficiency.
For solving the problems of the technologies described above, the present invention proposes a kind of process of high-strength steel rewelding, its operation principle is: at first, be heated to low preheat temperature in a big way at the distance bevel for welding, suitably reduce the thermograde and the additional stress of member.Then, in the time of welding, in welding place back side correspondence position continues among a small circle, concentrate heating, keep local higher weld preheating temperature.At last, utilizing thermal source more than needed that welding line is carried out the suitable after heat hydrogen that disappears handles.
Specifically may further comprise the steps:
The first step, for the big slab high-strength steel member weld seam to be reprocessed of removing weld defect, in that fully to be heated to temperature in each side 500mm scope of weld seam be 80～90 ℃ apart from waiting to reprocess,
In second step, concentrate heating at welding place back side correspondence position, and to keep with welding place be that the weld preheating temperature of the 20-50mm regional area at center is 200 ± 20 ℃.
In the 3rd step, begin welding; In the time of welding, continuing heating and keeping local weld preheating temperature is 200 ± 20 ℃, and heating location remains on the zone of welding pool the place ahead 20-50mm, moves along with moving of welding pool.
Further, also comprise step: in the 4th step, utilize thermal source more than needed that welding line is carried out the suitable after heat hydrogen that disappears and handle.
For the welding to be reprocessed of the large-sized steel member of big thickness, fully be heated to 80～90 ℃ waiting to reprocess in each side 500mm scope of weld seam, fully being heated to about 200 ℃ compared to existing technology shortened heat time heating time more than 2/3.Therefore, the present invention can improve the heat utilization ratio of big thick plate steel member weld preheating effectively, and energy savings improves and reprocesses welding quality and production efficiency.
Description of drawings
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is further described in detail.
Fig. 1 reprocesses the weld job schematic diagram for high-strength steel member corner joint.
Fig. 2 is that the A of Fig. 1 is to schematic diagram.
Fig. 3 reprocesses the weld job schematic diagram for high-strength steel member banjo fixing butt jointing.
Fig. 4 is that the B of Fig. 3 is to schematic diagram.
The specific embodiment
Certain large-scale trussed bridge steel construction has local weld seam to reprocess, technology preheating routinely earlier, owing to be big slab, large-size components, environment temperature is lower, fails abundant preheating, reprocesses success.Used the inventive method afterwards, made and reprocess successfully that effect was remarkable.
As shown in Figure 1 and Figure 2, corner connection is welded between high strength steel plate 3 and the high strength steel plate 4, specifically reprocesses technology and is:
Exclude all weld defects, be extended down to 10～15mm outside the crackle two ends, what form suitable weldering reprocesses weld groove 1,2, reprocesses weld groove 1,2 and near zone reveals metallic luster with the abrasive machine polishing;
Reprocessing in weld groove 1,2 each side 500mm scope of suitable weldering fully heated, and temperature is 80～90 ℃;
To reprocessing before weld groove 1 welding of suitable weldering, at high strength steel plate 4 back sides be on the weld seam 2 on the corresponding weld groove 1 position of welding point 11 continue to concentrate heating, making the local weld preheating temperature of welding point on the corresponding weld groove 1 is 200 ± 20 ℃;
Adopt CO
2Gas is protected weldering and is carried out rewelding, and in the time of welding, it is the position of welding pool 11 the place ahead 20-50mm that hot spot 12 remains on the welding point, moves along with moving of welding pool 11, and keeping local weld preheating temperature is 200 ± 20 ℃; Moderate welding parameter is selected in welding for use, adopts a short section multilayer to weld more, and use is received arc current and filled up arc crater, strict cleaning welding slag between welding bead, and butt welded seam 1 carries out suitable hammering processing;
Postwelding carries out after heat insulation processing to reprocessing weld seam 1 immediately.
Rewelding is finished after 48 hours and is carried out 100% magnetic powder inspection and ultrasonic examination, has all reached code requirement, reprocesses successfully.
As shown in Figure 3, Figure 4, dock welding between high strength steel plate 7 and the high strength steel plate 8, specifically reprocess technology and be:
Exclude all weld defects, be extended down to 10～15mm outside the crackle two ends, what form suitable weldering reprocesses weld groove 5,6, reprocesses weld groove 5,6 and near zone reveals metallic luster with the abrasive machine polishing;
Fully heat reprocessing in weld groove 5,6 each side 500mm scope, temperature is 80～90 ℃;
To reprocessing before weld groove 5 weldings of suitable weldering, at high strength steel plate 7,8 back sides be on the weld seam 6 on the corresponding weld groove 5 position of welding point 15 continue to concentrate heating, making the local weld preheating temperature of welding point 15 on the corresponding weld groove 5 is 200 ± 20 ℃;
Adopt CO
2Gas is protected weldering and is carried out rewelding, and in the time of welding, it is the position of welding pool 15 the place ahead 2050mm that hot spot 16 remains on the welding point, moves along with moving of welding pool 15, and keeping local weld preheating temperature is 200 ± 20 ℃; Moderate welding parameter is selected in welding for use, adopts a short section multilayer to weld more, and use is received arc current and filled up arc crater, strict cleaning welding slag between welding bead, and butt welded seam groove 5 carries out suitable hammering processing;
Postwelding carries out after heat insulation processing to reprocessing weld seam 5 immediately.
Rewelding is finished after 48 hours and is carried out 100% magnetic powder inspection and ultrasonic examination, has all reached code requirement, reprocesses successfully.
It should be noted last that, the above specific embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (2)
1. the process of a high-strength steel rewelding is characterized in that, may further comprise the steps:
The first step, for the big slab high-strength steel member weld seam to be reprocessed of removing weld defect, in that fully to be heated to temperature in each side 500mm scope of weld seam be 80～90 ℃ apart from waiting to reprocess,
In second step, concentrate heating at welding place back side correspondence position, and to keep with welding place be that the weld preheating temperature of the 20-50mm regional area at center is 200 ± 20 ℃.
In the 3rd step, begin welding; In the time of welding, continuing heating and keeping local weld preheating temperature is 200 ± 20 ℃, and heating location remains on the zone of welding pool the place ahead 20-50mm, moves along with moving of welding pool.
2. the process of high-strength steel rewelding according to claim 1 is characterized in that, also comprises:
In the 4th step, utilize thermal source more than needed that welding line is carried out the suitable after heat hydrogen that disappears and handle.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009103025739A CN101559549A (en) | 2009-05-25 | 2009-05-25 | Process method for rewelding of high strength steel |
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| CNA2009103025739A CN101559549A (en) | 2009-05-25 | 2009-05-25 | Process method for rewelding of high strength steel |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102267000A (en) * | 2010-06-02 | 2011-12-07 | 哈尔滨建成集团有限公司 | Metal active gas (MAG) welding method for butting quenched low-alloy super-high-strength steel and high-quality carbon structural steel |
| CN103308353A (en) * | 2012-03-08 | 2013-09-18 | 上海振华重工(集团)股份有限公司 | Prefabrication method for rewelding transverse crack of high-strength steel |
| CN103659017A (en) * | 2013-11-05 | 2014-03-26 | 领新(南通)重工有限公司 | Rework welding process for T-shaped connector full penetration weld of pivot steel structure of ocean engineering crane |
| CN103769725A (en) * | 2014-01-24 | 2014-05-07 | 中国核工业二三建设有限公司 | Method for reworking surface defect on back surface of weld joint of small container |
| CN104002030A (en) * | 2014-06-10 | 2014-08-27 | 中铁宝桥（扬州）有限公司 | Butt joint method for super-thick steel plates |
| CN104139228A (en) * | 2013-05-08 | 2014-11-12 | 中国核工业二四建设有限公司 | Thick steel plate welding process |
| CN107584194A (en) * | 2017-11-01 | 2018-01-16 | 上海沪东三造船舶配套有限公司 | The welding method of high intensity crack arrest steel |
| CN113042853A (en) * | 2021-03-03 | 2021-06-29 | 中国船舶重工集团公司第七二五研究所 | Method for repairing non-composite area of pure copper T2-steel composite board |
-
2009
- 2009-05-25 CN CNA2009103025739A patent/CN101559549A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102267000A (en) * | 2010-06-02 | 2011-12-07 | 哈尔滨建成集团有限公司 | Metal active gas (MAG) welding method for butting quenched low-alloy super-high-strength steel and high-quality carbon structural steel |
| CN102267000B (en) * | 2010-06-02 | 2012-12-12 | 哈尔滨建成集团有限公司 | Metal active gas (MAG) welding method for butting quenched low-alloy super-high-strength steel and high-quality carbon structural steel |
| CN103308353A (en) * | 2012-03-08 | 2013-09-18 | 上海振华重工(集团)股份有限公司 | Prefabrication method for rewelding transverse crack of high-strength steel |
| CN104139228A (en) * | 2013-05-08 | 2014-11-12 | 中国核工业二四建设有限公司 | Thick steel plate welding process |
| CN103659017A (en) * | 2013-11-05 | 2014-03-26 | 领新(南通)重工有限公司 | Rework welding process for T-shaped connector full penetration weld of pivot steel structure of ocean engineering crane |
| CN103659017B (en) * | 2013-11-05 | 2016-03-16 | 领新(南通)重工有限公司 | Ocean engineering loop wheel machine maincenter steel construction T connector full penetration weld reprocesses welding procedure |
| CN103769725A (en) * | 2014-01-24 | 2014-05-07 | 中国核工业二三建设有限公司 | Method for reworking surface defect on back surface of weld joint of small container |
| CN103769725B (en) * | 2014-01-24 | 2015-09-30 | 中国核工业二三建设有限公司 | A kind of method of reprocessing the blemish of the back of weld of small containers |
| CN104002030A (en) * | 2014-06-10 | 2014-08-27 | 中铁宝桥（扬州）有限公司 | Butt joint method for super-thick steel plates |
| CN107584194A (en) * | 2017-11-01 | 2018-01-16 | 上海沪东三造船舶配套有限公司 | The welding method of high intensity crack arrest steel |
| CN113042853A (en) * | 2021-03-03 | 2021-06-29 | 中国船舶重工集团公司第七二五研究所 | Method for repairing non-composite area of pure copper T2-steel composite board |
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