CN103293036B - Prefabricating method of high-strength steel re-welded transverse cracks - Google Patents
Prefabricating method of high-strength steel re-welded transverse cracks Download PDFInfo
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- CN103293036B CN103293036B CN201210060281.0A CN201210060281A CN103293036B CN 103293036 B CN103293036 B CN 103293036B CN 201210060281 A CN201210060281 A CN 201210060281A CN 103293036 B CN103293036 B CN 103293036B
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Abstract
The invention provides a prefabricating method of high-strength steel re-welded transverse cracks. The prefabricating method comprises the following steps of: providing test pieces for welding, wherein U-shaped grooves are formed in the upper surfaces of the test pieces for welding; welding reinforced bottom plates on the lower surfaces of the test pieces for welding at the two ends of the U-shaped grooves; welding the U-shaped grooves to form the re-welded cracks in the grooves. According to the prefabricating method disclosed by the invention, parameters for controlling the cracks are determined through detecting a prefabricated crack shape and standard parameters are adjusted to realize the aim of controlling the cracks. The re-welded transverse cracks can be prefabricated by the method, and the transverse cracks in a field re-welding process can be controlled according to transverse crack characteristics.
Description
Technical field
The present invention relates to a kind of method for prefabricating of high-strength steel rewelding transversal crack.
Background technology
The widespread use in the ocean weight equipments such as marine engineering equipment, bridge spanning the sea, naval vessel, Wind Power Plant at Sea of large slab high-strength steel structure.Slab high-strength steel easily produces cold crack, especially the welding transversal crack of retardance, and its latent period is long, and crackle is small, not easily detects, and its harmfulness is very big.Control large ocean equipment high-strength steel structure welding and rewelding retardance transversal crack ensure one of its workmanship and the of paramount importance technical indicator of safety in utilization.Because welding cold cracking is by environment, mother metal, wlding, protection gas, welding method, electric current, voltage, stem elongation, preheat temperature, interlayer temperature, after heat, version, restrain the significant complexity of the multifactor impacts such as intensity, make welding transversal crack Producing reason, cold crack production process and feature thereof are not very clear, be difficult to realize the accurate judgement to welding transversal crack, effectively control method is not had to the weld seam transversal crack of detrimental effects welding quality, therefore the bottleneck difficult problem that welding transversal crack controls is become, also be the large slab high-strength steel welding field very challenging hot issue of tool always.
In order to solve rewelding crack problem, needing the crack form precasting on-the-spot rewelding in laboratory, the test of Criterion, finding the principal element producing rewelding transversal crack, thus reach the object controlling rewelding transversal crack.At present, the method of precrack is a lot, but the method for prefabricated rewelding transversal crack have not been reported, G-BOP transversal crack method is mainly contained for single-run welding transversal crack method, for the prefabricated way of multi-run welding crackle as window type lock test, a bar test etc., but do not adopt this kind of form to carry out rewelding crackle lock test, to the morphological feature of rewelding crackle and distribution also comprehensive, more reports are also had no to control rewelding transversal crack method.Especially, the U-shaped groove simulation rewelding transversal crack method for prefabricating of 690MPa rank and control technology have not been reported.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method for prefabricating of high-strength steel rewelding transversal crack, can transversal crack in prefabricated rewelding, is conducive to controlling the transversal crack in on-the-spot rewelding process.
For solving the problems of the technologies described above, the invention provides a kind of method for prefabricating of high-strength steel rewelding transversal crack, comprising:
There is provided test piece for welding, the upper surface of described test piece for welding has U-type groove;
On the lower surface of the test piece for welding at described U-type groove two ends, base plate is strengthened in welding;
To be formed, weld seam is reprocessed wherein to described U-type groove welding.
Alternatively, the yield strength of described test piece for welding is greater than 550MPa.
Alternatively, the thickness of the test piece for welding bottom described U-type groove is 8mm to 12mm.
Alternatively, weld seam is reprocessed described in employing submerged arc welding, flux-cored arc welding or covered arc welding are formed.
Alternatively, also comprise after reprocessing weld seam described in formation: carrying out flaw detection is carried out to described weld seam of reprocessing.
Compared with prior art, the present invention has the following advantages:
In the method for prefabricating of the high-strength steel rewelding transversal crack of the embodiment of the present invention, formed in U-type groove and reprocess weld seam, the test piece for welding retained bottom U-type groove can produce higher meridional stress, in addition U-type groove can impel reprocess weld seam cooling velocity accelerate, be conducive to the generation of transversal crack.In addition, strengthen base plate in the lower surface welding of test piece for welding, bending angle can be prevented to be out of shape, add the stress of thickness direction, thus higher stress can be produced concentrate, be conducive to the generation impelling transversal crack.The parameter of crackle can be determined to control by detecting prefabricated transversal crack form, through adjustment standard parameter, thus reaching the object controlling crackle
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the method for prefabricating of the high-strength steel rewelding transversal crack of the embodiment of the present invention;
Fig. 2 is the three-dimensional structure diagram that the method for prefabricating of the high-strength steel rewelding transversal crack of the embodiment of the present invention is corresponding;
Fig. 3 is the sectional view of Fig. 2 along A-A ' direction.
Embodiment
Below in conjunction with specific embodiments and the drawings, the invention will be further described, but should not limit the scope of the invention with this.
Fig. 1 shows the schematic flow sheet of the method for prefabricating of the rewelding transversal crack of the present embodiment, comprising:
Step S11, provides test piece for welding, and the upper surface of described test piece for welding has U-type groove;
Step S12, on the lower surface of the test piece for welding at described U-type groove two ends, base plate is strengthened in welding;
Step S13, reprocesses weld seam to described U-type groove welding to be formed wherein.
It should be noted that, herein, term " transversal crack " refers to the crackle of bearing of trend perpendicular to weld seam bearing of trend, and term " longitudinal direction " refers to the bearing of trend being parallel to weld seam.
Three staples that transversal crack produces have: diffusible hydrogen content, seam organization and constraint stress, in the present embodiment, in order to simulated field obtains transversal crack, adopt U-type groove and stiffening plate to provide larger meridional stress.
Fig. 2 shows three-dimensional structure diagram corresponding to the method for prefabricating of high-strength steel rewelding transversal crack in the present embodiment, and Fig. 3 is the sectional view of Fig. 2 along A-A ' direction, is described in detail below in conjunction with Fig. 1 to Fig. 3.
In step s 11, provide test piece for welding 21, the upper surface of test piece for welding 21 has U-type groove 211.The surrender yield strength of test piece for welding 21 is greater than 550MPa, is specially 690MPa in the present embodiment.The opening subtended angle α of U-type groove 211 is 25 °, and the thickness d of the test piece for welding 21 of the reservation bottom U-type groove 211 is 8mm to 12mm, is specially 10mm in the present embodiment.
In step s 12, on the lower surface of the test piece for welding 21 at U-type groove 211 two ends, base plate 22 is strengthened in welding.Strengthen base plate 22 and be positioned at the lower surface of test piece for welding 21, the two ends of U-type groove 211, strengthen the bearing of trend of base plates 22 perpendicular to the bearing of trend of U-type groove 211 for two pieces.The weld seam 23 that also show test piece for welding 21 in Fig. 2 and strengthen between base plate 22.
In step s 13, to U-type groove 211 welding, thus weld seam is reprocessed in formation wherein.The formation method of reprocessing weld seam can be submerged arc welding (SAW), flux-cored arc welding (FCAW) or covered arc welding (SMAW).
Performing step S14 afterwards, carrying out carrying out flaw detection to reprocessing weld seam, detect the pattern reprocessing transversal crack in weld seam.
In actual applications, repeatedly can carry out test of many times, adopt different welding methods to be formed under different welding parameters and reprocess weld seam, so that control the generation of transversal crack in rewelding process at the scene.In the present embodiment, under different welding method, heat input and interlayer temperature, carry out crackle contrast test, welding method is respectively submerged arc welding, flux-cored arc welding and covered arc welding, and preheat temperature is not preheating.Heat input adopts maximum 2.1 ~ 2.5kg/cm
2, minimum thermal is input as 0.7 ~ 1.5kg/cm
2, interlayer temperature is continuous sequence, is cooled to nearly room temperature two kinds of situations, and 8 groups of test parameterss are as shown in the table:
For Q690 steel (namely yield strength is 690MPa), because plasticity is poor, carbon equivalent is high, cold cracking inclination is large, organize very easily brittle, welding transversal crack presents 90 ° of angles, and the transversal crack rate of root is very high, inner also exist brittle fine crack, and the generation of its crackle is mainly due to caused by hydrogen, tissue and meridional stress.
The rewelding crackle of Q690 steel thick plate mainly comprises three types: micro-crack in the vertical large crackle of root micro-crack, weld seam, weld seam.Wherein, root micro-crack is that constraint stress and fusion area are organized caused by embrittlement, and collateral security preheat temperature and postwelding hammering stress-removal control; The large vertical crack of weld seam is that caused by under tissue embrittlement, hydrogen richness, constraint stress acting in conjunction, collateral security interlayer temperature, preheat temperature, thermal weld stress ensure less weld seam cooling velocity.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible variation and amendment, the scope that therefore protection scope of the present invention should define with the claims in the present invention is as the criterion.
Claims (4)
1. a method for prefabricating for high-strength steel rewelding transversal crack, is characterized in that, comprising:
There is provided test piece for welding, the upper surface of described test piece for welding has U-type groove, remains with the described test piece for welding of part bottom described U-type groove;
On the lower surface of the test piece for welding at described U-type groove two ends, base plate is strengthened in welding;
To be formed, weld seam is reprocessed wherein to described U-type groove welding;
Wherein, the yield strength of described test piece for welding is greater than 550MPa.
2. the method for prefabricating of high-strength steel rewelding transversal crack according to claim 1, is characterized in that, the thickness of the test piece for welding bottom described U-type groove is 8mm to 12mm.
3. the method for prefabricating of high-strength steel rewelding transversal crack according to claim 1, is characterized in that, reprocesses weld seam described in employing submerged arc welding, flux-cored arc welding or covered arc welding are formed.
4. the method for prefabricating of high-strength steel rewelding transversal crack according to claim 1, is characterized in that, also comprises: carry out carrying out flaw detection to described weld seam of reprocessing after reprocessing weld seam described in formation.
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| GB2527746B (en) * | 2014-06-18 | 2018-05-30 | Bae Systems Plc | Improved weld procedures and weld procedure approval test for HY100 steel |
| CN107782592B (en) * | 2016-08-30 | 2020-11-03 | 中国石油天然气股份有限公司 | Method and system for manufacturing circumferential weld crack defects |
| CN111624254B (en) * | 2020-05-29 | 2022-12-02 | 广船国际有限公司 | Submerged arc welding transverse crack test method |
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| CN101104234A (en) * | 2007-08-10 | 2008-01-16 | 四川东风电机厂有限公司 | Water wheel generating set cast steel part defect repair welding crackle processing method |
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| JP3896031B2 (en) * | 2002-04-25 | 2007-03-22 | 新日本製鐵株式会社 | Manufacturing method of high strength UOE steel pipe |
| JP4482355B2 (en) * | 2004-03-17 | 2010-06-16 | 新日本製鐵株式会社 | Seam welding method for high strength UO steel pipe with excellent transverse cracking resistance |
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| CN101104234A (en) * | 2007-08-10 | 2008-01-16 | 四川东风电机厂有限公司 | Water wheel generating set cast steel part defect repair welding crackle processing method |
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| 大厚板高强钢补焊横向裂纹试验及产生机理;张华军等;《焊接学报》;20110425;第32卷(第4期);第75-76页 * |
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