CN105522304B - It is a kind of to fuse the good high heat-input welding point of line position impact flexibility - Google Patents
It is a kind of to fuse the good high heat-input welding point of line position impact flexibility Download PDFInfo
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- CN105522304B CN105522304B CN201610086092.9A CN201610086092A CN105522304B CN 105522304 B CN105522304 B CN 105522304B CN 201610086092 A CN201610086092 A CN 201610086092A CN 105522304 B CN105522304 B CN 105522304B
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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Abstract
The good high heat-input welding point of line position impact flexibility is fused this application discloses a kind of, the joint is formed by steel plate through high heat-input welding single pass docking, and welding point meets condition：1), the tensile strength of weld seam is 80% the 110% of mother metal tensile strength, and the tensile strength of coarse grain heat affect zone is 90% the 110% of weld seam tensile strength；2), coarse grain heat affect zone width be mother metal thickness 20% and its it is following, weld width be mother metal thickness 120% and its it is following；3), the original austenite grain diameter of coarse grain heat affect zone is below 300 μm, and intragranular acicular ferrite content is more than 50%.The present invention can form the high-strength steel sheet high heat-input single pass welding point that thickness of slab is more than 40mm, and particularly fusing line position has sufficiently high low-temperature flexibility.Welding point with feature of present invention is more than 90J in 20 DEG C of cold impact values of fusion line position.
Description
Technical field
Formed big the present invention relates to a kind of welding structural body, particularly steel plate of the single pass welding thickness of slab more than 40mm
Heat input welding point；Melt run area in joint performance, especially heat affected area is improved by each field strength matched design
Domain impact flexibility.
Background technology
With the maximization of the Structural Engineerings such as extra large work, ship, applying for big thickness steel plate is improved using high-efficiency welding method
Work efficiency rate is very necessary, the big heat of such as FCB methods multiplewire submerged arc welding, monofilament/tandem electrogas welding, monofilament/mariages electroslag welding
Input welding technique is widely used.These efficient welding technologies help that welding bead quantity is greatly decreased, and realize the single track of slab
Secondary welding forming.Thermal weld stress increases also with the increase of thickness of slab, and particularly the heat input of electroslag welding is up to 400-
1000kJ/cm, can single pass welding thickness of slab 40-100mm steel plate.
But for below tensile strength rank 800MPa low-alloy steel, when heat affected area is welded by high heat-input
Thermal cycle after, coarse grain heat affect zone, the coarse grain heat affect zone crystal grain particularly near melt run is seriously roughened, and fragility occurs
Tissue, the toughness for causing the region deteriorate.
In order to solve this problem, researcher is using high-melting-point inclusion particle in coarse grain heat affect zone to austenite grain boundary
Pinning effect to suppress austenite crystal thick, and promote the good acicular ferrite nucleating of transgranular obdurability, develop coarse-grain
Heat affected area tenacity excellent steel plate (for example, JP2005036295, JP2008308736, JP2013136813,
CN103114241A, CN104411849A, CN104404369A etc.).Although these patented technologies pass through coarse grain heat affect zone group
The low-temperature flexibility in melt run region can be improved to a certain degree by knitting control technology, but not considered between coarse grain heat affect zone and weld seam
Strength difference cause to fuse the stress concentration of line position, will also result in fusion line position low-temperature flexibility fluctuation.
Patent application CN13732776A has considered the matching relationship of welding point heat affected area intensity and toughness, but
The technology of announcement is only applicable to thickness≤4mm thin plate, and thermal weld stress amount is smaller；Patent application CN100537108C proposes weldering
The technology for connecing strength of joint matching improvement joint resistance to brittle fracture energy belongs to high heat-input category, but its regulation weld width is
Thickness of slab 70% and its it is following, and do not consider the influence of butt joint low-temperature flexibility.
The content of the invention
The good high heat-input welding point of line position impact flexibility is fused it is an object of the invention to provide a kind of, this connects
Head is formed by thickness of slab >=40mm steel plate through high heat-input welding single pass docking, by controlling weld seam, heat affected area and mother metal
Strength matching relation between three, improve the low-temperature flexibility of the low-temperature flexibility of welding point, especially welding fusion line position.
To achieve the above object, the present invention provides following technical scheme：
The embodiment of the present application discloses a kind of good high heat-input welding point of fusion line position impact flexibility, the joint
Formed by steel plate through high heat-input welding single pass docking, welding point meets condition：
1), the tensile strength of weld seam is the 80%-110% of mother metal tensile strength, and the tensile strength of coarse grain heat affect zone
It is the 90%-110% of weld seam tensile strength；
2), coarse grain heat affect zone width be mother metal thickness 20% and its it is following, weld width is the 120% of mother metal thickness
It is and its following；
3), the original austenite grain diameter of coarse grain heat affect zone is below 300 μm, and intragranular acicular ferrite content is 50%
More than.
Preferably, in the good high heat-input welding point of above-mentioned fusion line position impact flexibility, the condition 2)
In, weld width is 0.8~1.2 times of mother metal thickness.
Preferably, in the good high heat-input welding point of above-mentioned fusion line position impact flexibility, the condition 2)
In, coarse grain heat affect zone width is 0.06~0.17 times of mother metal thickness.
Preferably, in the good high heat-input welding point of above-mentioned fusion line position impact flexibility, the condition 3)
In, the original austenite grain diameter of coarse grain heat affect zone is in 268~296mm.
Preferably, in the good high heat-input welding point of above-mentioned fusion line position impact flexibility, the condition 3)
In, intragranular acicular ferrite content is 52%~63%.
Preferably, in the good high heat-input welding point of above-mentioned fusion line position impact flexibility, the condition 1)
In, the tensile strength of coarse grain heat affect zone is weld seam tensile strength, 0.93~1.05 times.
Preferably, in the good high heat-input welding point of above-mentioned fusion line position impact flexibility, the condition 1)
In, the tensile strength of weld seam is 0.83~1.05 times of mother metal tensile strength.
Preferably, in the good high heat-input welding point of above-mentioned fusion line position impact flexibility, the steel of base metal
Kind is AH40 or EH36.
Preferably, in the good high heat-input welding point of above-mentioned fusion line position impact flexibility, the steel plate
Thickness is more than 40mm.
Preferably, in the good high heat-input welding point of above-mentioned fusion line position impact flexibility, welding point is full
Sufficient condition：
1), steel grade EH36；
2), thickness of slab 40mm；
3), welding method：Electroslag welding；
4), heat input：485kJ/cm；
5), the tensile strength of weld seam is the 0.89 of mother metal tensile strength, and the tensile strength of coarse grain heat affect zone is weld seam
The 0.99 of tensile strength；
6), coarse grain heat affect zone width is the 0.17 of mother metal thickness, and weld width is the 1.2 of mother metal thickness；
7), a diameter of 268 μm of the original austenite grain of coarse grain heat affect zone, intragranular acicular ferrite content are 63%.
Compared with prior art, the advantage of the invention is that：The present invention can form the high strength steel that thickness of slab is more than 40mm
Plate high heat-input single pass welding point, particularly fusing line position has sufficiently high low-temperature flexibility.With feature of present invention
Welding point fusion line position -20 DEG C of cold impact values be more than 90J.
Brief description of the drawings
, below will be to embodiment or existing in order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments described in application, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 show slag Welding EH36 plate joints and the neighbouring coarse-grain hot shadow of melt run in the specific embodiment of the invention 3
Ring typical organization's photo in area.
Embodiment
In engineering practice, although with the high heat-input steel plate in the technical schemes such as such as CN104404369A, welding point
Low-temperature flexibility, the impact flexibility for especially fusing line position still has that fluctuation is big, wild effect.It can be seen that only by
Control mother metal tissue or intensity do not ensure that the low-temperature flexibility of all positions of welding point.
Inventor carries out comprehensive analysis to the welding point under the conditions of multiple different-thickness specifications, different heat inputs, in detail
The indexs such as the microstructure, intensity, low-temperature impact toughness of weld metal zone, coarse grain heat affect zone and mother metal are looked into fine tuning.Result of the test shows
Show：The strength difference in the low-temperature flexibility region adjacent thereto of fusion line position is relevant, and the impact of line position is fused when difference is larger
Toughness is poor.
In view of in current engineering welding structure design, ratio (such as field trash, microcrack) the defects of because of weld metal zone
Significantly larger than mother metal steel plate, in order to ensure the intensity of welding point, frequently with high-strength matching principle (i.e. selected weld metal when with
Strength of parent is compared and forms high-strength matching).And the low-alloyed TMCP steel plates of low C are used after high heat-input welds, coarse-grain hot shadow
Ring area's intensity and differ larger with the weld seam of high-strength design, therefore cause the local stress near melt run excessive, it is tough so as to cause
The deterioration of property.
Therefore, designed by welding the strength matching of coarse grain heat affect zone and weld seam, reduce high heat-input welding point and melt
It is vital that local stress at zygonema improves to the toughness in the region.It is local for high heat-input welding point
Stress is mainly derived from by uneven temperature field in welding process and the partial mold deformation caused by it, therefore limits fusion
Coarse grain heat affect zone and the ratio of weld width and mother metal thickness near line, help to suppress region generation plastic deformation and drop
Low local stress, so as to improve the low-temperature flexibility at melt run.
Meanwhile the microcosmic anti-brittle fracture characteristic improved near melt run is also very necessary.Melt run by inquiry
The mechanism of brittle fracture and the relation of tissue nearby occurs, it is found that original austenite grain size is suppressed to reduced size,
Ensure the transgranular acicular ferrite content with significant proportion simultaneously, it is possible to ensure good low-temperature flexibility.
In summary, the intensity of rational matching welding coarse grain heat affect zone and weld metal zone, control coarse grain heat affect zone, weldering
Seam and the ratio of mother metal thickness, while improve the microstructure of welding coarse grain heat affect zone, effectively it can improve in welding point
Fuse the low-temperature flexibility of line position, therefore the joint design of the welding point in high heat-input single pass welding thickness of slab >=40mm
In, following condition should be met：
(1) tensile strength of weld seam is the 80%-110% of mother metal tensile strength, and the tensile strength of coarse grain heat affect zone
It is the 90%-110% of weld seam tensile strength.
(2) coarse grain heat affect zone width mother metal thickness 20% and its it is following, weld width in mother metal thickness 120%
It is and its following.
(3) the original austenite grain diameter of coarse grain heat affect zone is below 300 μm, and intragranular acicular ferrite ratio is 50%
More than.
According to the present invention, the high-strength steel sheet high heat-input single pass welding point that thickness of slab is more than 40mm can be formed, it is special
It is not that fusion line position has sufficiently high low-temperature flexibility.
The present invention is described further by the following example：According to following embodiments, the present invention may be better understood.
However, as it will be easily appreciated by one skilled in the art that specific material ratio, process conditions and its result described by embodiment are only used
In the explanation present invention, without should be also without limitation on the present invention described in detail in claims.
In the present embodiment, to AH40 the and EH36 steel plates of different thicknesss of slab, big heat is carried out from the other wlding of different intensity scale
Slag Welding is inputted, to form the joint of varying strength matching, the parameters of probe joint are shown in Table 1.
The intensity in each region of welding point is detected using micro tensile specimen, and low-temperature flexibility is according to national standard GB/T
2650-2008 is carried out.After corrosion, Welded Joints carry out metallographic observation, carry out dimensional measurement and attached to melt run to each region
The original austenite grain size and intragranular acicular ferrite content of the coarse grain heat affect zone of near field carry out statistical analysis, as a result see
Table 1.
The high heat-input welding point parameter comparison of table 1
Note：Letter abbreviations represent respectively in table --- CGHAZ (coarse grain heat affect zone), WM (weld seam), BM (mother metal), FL
(melt run), TS (tensile strength), AF (acicular ferrite)
The result of table 1 shows that embodiment 1-4 center taps meet：
0.9≤coarse grain heat affect zone intensity/weld strength≤1.1,0.8≤weld strength/strength of parent≤1.1, and
Coarse grain heat affect zone width is within the 30% of mother metal thickness, and weld width is within the 120% of mother metal thickness, near melt run
Coarse grain heat affect zone original austenite grain diameter be no more than 300 μm, acicular ferrite ratio therein is more than 50%.
In embodiment 3 therefore the typical organization of coarse grain heat affect zone is as shown in figure 1, can guarantee that joint has well tough
Performance, -20 DEG C of cold impact values for particularly fusing line position are more than 90J.
Comparative example use with embodiment identical steel plate, but using higher intensity matching weld seam.As shown in Table 1, compare
Weld seam has higher intensity level in example 1-4, and embodiment is larger compared with the strength difference of coarse grain heat affect zone and mother metal, coarse-grain
Less than 0.9, the intensity of weld seam and mother metal is more than 1.1 for heat affected area and weld strength ratio.In addition, comparative example 1-2's is molten
Low-temperature flexibility at zygonema is poor.
In summary, according to technical solution of the present invention, can utilize the strength matching in each region improves welding point, especially
It is the toughness for fusing line position, so as to provide toughness and tenacity good high heat-input welding point.
Here, it should also be noted that, in order to avoid having obscured the present invention because of unnecessary details, in the accompanying drawings only
Show and according to the solution of the present invention closely related structure and/or processing step, and eliminate little with relation of the present invention
Other details.
Finally, it is to be noted that, term " comprising ", "comprising" or its any other variant be intended to it is non-exclusive
Property includes, so that process, method, article or equipment including a series of elements not only include those key elements, and
Also include the other element that is not expressly set out, or also include for this process, method, article or equipment inherently
Key element.
Claims (1)
1. a kind of fuse the good high heat-input welding point of line position impact flexibility, it is characterised in that the joint is passed through by steel plate
High heat-input welding single pass docking forms, and welding point meets condition：
1), the tensile strength of weld seam is 0.89~0.98 times of mother metal tensile strength, and the tensile strength of coarse grain heat affect zone is
0.99~1.05 times of weld seam tensile strength；
2), coarse grain heat affect zone width is 0.1~0.17 times of mother metal thickness, and weld width is the 1.1~1.2 of mother metal thickness
Times；
3), the original austenite grain diameter of coarse grain heat affect zone is in 268~283mm, intragranular acicular ferrite content 60%~
63%,
The mother metal steel grade is EH36, and the thickness of steel plate is 40~50mm, and welding manner uses electroslag welding, heat input：485~
554kJ/cm。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610086092.9A CN105522304B (en) | 2016-02-15 | 2016-02-15 | It is a kind of to fuse the good high heat-input welding point of line position impact flexibility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610086092.9A CN105522304B (en) | 2016-02-15 | 2016-02-15 | It is a kind of to fuse the good high heat-input welding point of line position impact flexibility |
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| Publication Number | Publication Date |
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| CN105522304A CN105522304A (en) | 2016-04-27 |
| CN105522304B true CN105522304B (en) | 2018-02-23 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105598576A (en) * | 2016-03-29 | 2016-05-25 | 常熟理工学院 | Tough and well-matched great heat input electroslag welding connector |
| CN108687429B (en) * | 2018-07-26 | 2020-11-03 | 华电曹妃甸重工装备有限公司 | Double-electric double-wire submerged arc welding method for high-strength steel plate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1418751A (en) * | 2001-11-13 | 2003-05-21 | 川崎制铁株式会社 | Large quantity heat conducted welded joint and welding method thereof |
| JP2009221522A (en) * | 2008-03-14 | 2009-10-01 | Kobe Steel Ltd | Steel sheet having excellent sheet thickness direction toughness of high heat input weld heat affected zone and method for manufacturing the same |
| CN102080193A (en) * | 2011-01-10 | 2011-06-01 | 东北大学 | Structural steel for welding with ultra-great heat input and manufacturing method thereof |
| CN104404369A (en) * | 2014-11-27 | 2015-03-11 | 宝山钢铁股份有限公司 | Thick steel plate capable of being welded at large heat input and manufacturing method thereof |
-
2016
- 2016-02-15 CN CN201610086092.9A patent/CN105522304B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1418751A (en) * | 2001-11-13 | 2003-05-21 | 川崎制铁株式会社 | Large quantity heat conducted welded joint and welding method thereof |
| JP2009221522A (en) * | 2008-03-14 | 2009-10-01 | Kobe Steel Ltd | Steel sheet having excellent sheet thickness direction toughness of high heat input weld heat affected zone and method for manufacturing the same |
| CN102080193A (en) * | 2011-01-10 | 2011-06-01 | 东北大学 | Structural steel for welding with ultra-great heat input and manufacturing method thereof |
| CN104404369A (en) * | 2014-11-27 | 2015-03-11 | 宝山钢铁股份有限公司 | Thick steel plate capable of being welded at large heat input and manufacturing method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 大焊接热输入船板EH40气电立焊接头的组织和性能;张宇等;《焊接》;20130331(第3期);第38页右栏第1段至第40页右栏最后一段，图1-6 * |
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