CN104271301B - Welded structure - Google Patents
Welded structure Download PDFInfo
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- CN104271301B CN104271301B CN201380023607.5A CN201380023607A CN104271301B CN 104271301 B CN104271301 B CN 104271301B CN 201380023607 A CN201380023607 A CN 201380023607A CN 104271301 B CN104271301 B CN 104271301B
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- engaging member
- attachment
- charpy
- fillet
- welded
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Classifications
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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
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/025—Seam welding; Backing means; Inserts for rectilinear seams
- B23K9/0256—Seam welding; Backing means; Inserts for rectilinear seams for welding ribs on plates
-
- 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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- 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
- B23K2101/18—Sheet panels
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
Have the attachment that will be more than thickness of slab 50mm and all have butt joint portion and engaging member butt up against the fillet-welded joint that at least one party in that the mode on the weld part surface in the butt joint portion of engaging member is engaged by fillet welding, leg length or deposition width is below a 16mm welded structure with the weld part end face in the butt joint portion by attachment, having vTrs-W (DEG C) by the weld metal in the butt joint portion making attachment and/or engaging member is less than-65 DEG C and/or vE
-20the toughness that-W (J) is more than 140J, and be the thickness of slab (t of attachment in the butt joint section had at fillet-welded joint at interface
w) more than 95% non-welded portion, and make vTrs (DEG C) and/or the vE of fillet welding metal
-20(J) with the thickness of slab (t of engaging member
f) meet the relation specified, before forming large-scale damage, stop the propagation of brittlement crevasse crack thus.
Description
Technical field
The use steel plate that the present invention such as relates to Large Container Ship, bulk carrier etc. carries out the weldable steel structure of welding procedure, particularly relates to and can make welded structure that namely the propagation of the brittlement crevasse crack produced from welded-joint stops before the large-scale damage causing structure, brittlement crevasse crack propagation Stopping Ability excellence.
Background technology
Container ship/bulk carrier is in order to improve delivered payload capability, improve cargo loading and unloading capability efficiency etc., and such as different from oil tanker etc. have the structure reducing partition wall belowdecks, increase the opening portion on ship top.Therefore, in container ship, bulk carrier, especially need ship hull plate to realize high strength or wall thickening.
In addition, container ship is tending towards maximizing in recent years, builds 6, the argosy of 000 ~ 20,000TEU and so on.In addition, TEU (Twenty Feet Equivalent Unit) represents the number being converted into the container of length 20 feet, represents the index of the delivered payload capability of container ship.With the maximization of such ship, there is use thickness of slab: more than 50mm, yield strength: 390N/mm in ship hull plate
2the trend of the steel plate that level is above.
As the steel plate of ship hull plate, in recent years for the viewpoint of reduction of erection time, in most cases such as carry out butt welding by the Large Heat Input Welding of pneumoelectric arc-welding etc.In such Large Heat Input Welding, easily produce significantly toughness at welding heat affected zone and reduce, become 1 reason easily producing brittlement crevasse crack from welded-joint.In Ship Structure, all the time for the viewpoint of security, even if when producing brittle break, also needing to make the propagation of brittlement crevasse crack stop before reaching large-scale damage, being separated to prevent hull.
Affect by such thinking, report in non-patent literature 1 about the result of study of making the experiment of the brittlement crevasse crack propagation progress of the weld part of ship plate of thickness of slab less than 50mm.
In non-patent literature 1, experimental investigation is forced the propagation path of the brittlement crevasse crack produced, is propagated progress at weld part.If wherein record the destruction toughness of the weld part guaranteed to a certain degree, then affect by weld residual stress the result that the many meetings of brittlement crevasse crack overflow from weld part to mother metal side.But, confirm again the example that many cases brittlement crevasse crack is propagated along weld part on the other hand.This means to assert there is not the possibility of brittle break along weld part extension propagation.
But, be applied to boats and ships that thickness of slab builds less than the steel plate of 50mm do not occur any problem and the more passing experience of sailing and the good steel plate mother metal (shipbuilding E level steel etc.) of toughness fully can keep the experience of the ability stopping brittlement crevasse crack based on by with the equal welding of welding of applying in non-patent literature 1, in ship's classification benchmark etc., do not have particular/special requirement to the brittlement crevasse crack propagation halt characteristic in shipbuilding welded steel portion all the time.
But, in recent years more than in the Large Container Ship of 6,000TEU, the thickness of slab of the steel plate of use exceeds 50mm, thickness of slab increase will cause destroy toughness reduction.And then, adopt the Large Heat Input Welding that heat input is larger, the trend that the destruction toughness that there is weld part reduces further.In the Large Heat Input Welding joint of such heavy wall, the brittlement crevasse crack produced from weld part extends to mother metal side without effusion, and there is brittlement crevasse crack in the steel plate mother metal portion of aggregate etc. also non-stop possibility (such as, non-patent literature 2).Therefore, guarantee that the security of the Ship Structure of the thick high-strength steel plate applying more than thickness of slab 50mm becomes large problem.In addition, also point out as making the brittlement crevasse crack of generation stop propagating in non-patent literature 2, the steel plate of the crevasse crack propagation halt characteristic that needs to enbrittle especially.
For such problem, such as, in patent document 1, record following welded structure, the ship hull plate of its to be thickness of slab be more than 50mm, and configure aggregate in the mode of intersecting with butt welding portion, engage this aggregate by fillet welding.
In the technology described in patent document 1, as this aggregate, use and there is the suitable particle diameter of leveled circular that the thickness spreading all over more than 3mm in skin section and nexine portion has 0.5 ~ 5 μm, and the x-ray face strength ratio of (100) crystal plane is the steel plate of the micro-structural of more than 1.5 in the face parallel with plate thickness surface.By using the steel plate with such micro-structural as enhancing material implement fillet welding, even if produce brittlement crevasse crack in butt welding portion, also can stop the propagation of brittlement crevasse crack brittlement crevasse crack in the aggregate as enhancing material, the fatal damage that welded structure destroys can be prevented.
In addition, following welded structure is recorded in patent document 2, it has attachment (following, also referred to as web) be welded in engaging member (below by fillet welding, also referred to as flange) and the fillet-welded joint of formation, and excellent in brittlement crevasse crack propagation halt characteristic.
In the welded structure described in patent document 2, fillet-welded joint section web, remain non-welded portion with the interface of flange.Further, toughness Kca is stopped to meet the mode of special relational expression to adjust the width in non-welded portion with the brittlement crevasse crack propagation of the same engaging member of the ratio X (flange) making the pin length of the left and right in the width in this non-welded portion and fillet welding portion and web thickness of slab sum.Thus, even if engaging member (flange) is formed as thickness of slab: the heavy-gauge sheeting of more than 50mm, also the interface of the web of the propagation of the brittlement crevasse crack produced at attachment (web) in fillet welding portion and flange can be made to stop, brittlement crevasse crack can be stoped to the propagation of engaging member (flange).
Patent document 1: Japanese Unexamined Patent Publication 2004-232052 publication
Patent document 2: Japanese Unexamined Patent Publication 2007-326147 publication
Non-patent literature 1: SRAJ the 147th research department's meeting: " about the research of hull by the brittle break intensity evaluation of high-tensile steel large-line energy joint ", No. 87 (in February, 1978), p.35 ~ 53, SRAJ
Non-patent literature 2: mountain pass is glad more etc.: " application of the research and development of super-container vessel, new high strength pole steel plate ", Japanese boats and ships ocean engineering can will, No. 3 (2005), p.70 ~ 76, Heisei in November, 17
But, use in the technology described in patent document 1, as strengthening the aggregate of material to form the steel plate with desired structure, need complicated manufacturing process.Therefore, there is the problem that productivity reduces, not easily stably guarantees the steel plate with required structure.
In addition, the technology described in patent document 2 is intended to the technology being stoped the propagation of the brittlement crevasse crack produced at attachment (web) by the combination of the discontinuity of structure and the brittlement crevasse crack propagation halt characteristic of engaging member (flange).
But, as SRAJ the 169th committee report (" research-report-about the destruction management control design case of Ship Structure ", (1979), p.118 ~ 136, the committee of SRAJ the 169th) shown in, confirm under normal circumstances by experiment, with made by engaging member (flange) compared with the brittlement crevasse crack propagation produced at attachment (web) stops, by attachment (web), the brittlement crevasse crack propagation produced in the engaging member (flange) of fillet-welded joint to be stopped more difficult.
Although clearly do not record reason to this, but think when chapping the destruction driving force (stress amplification coefficient) when importing T connector portions into when importing attachment (web) into as 1 factor, larger compared with importing the situation of engaging member (flange) into.
Thus, stop to be made the brittlement crevasse crack (web) produced in engaging member (flange) propagate by attachment, the brittlement crevasse crack propagation halt characteristic etc. of the attachment (web) of the technology described in patent document 2 is not enough to realize, therefore not sufficient technology.
In addition, in patent document 2 for the brittlement crevasse crack propagation halt characteristic of attachment (web) also without any enlightenment.
Namely, technology described in patent document 2, such as the situation that brittlement crevasse crack virtual in " brittlement crevasse crack suppression design guidelines " (in September, 2009 formulation) of NK ship's classification, that produce in the strength deck (suitable with flange) of Large Container Ship to be propagated and so on to coaming (suitable with web), not there is enough crevasse crack propagation halt characteristics.
And then, in the technology described in patent document 2, along with the width in non-welded portion diminishes with the ratio X of the pin length of the left and right in fillet welding portion with the thickness of slab sum of web, in order to meet specific formula, need the brittlement crevasse crack propagation increasing flange to stop toughness Kca.But increase, the production energy rate of calendering load when brittlement crevasse crack propagation stops the increase of toughness Kca that steel plate can be caused to manufacture reduce, the increase of manufacturing cost.
Summary of the invention
The object of the invention is to the problem solving above-mentioned prior art, there is provided one can not only propagate to attachment (web) being formed the brittlement crevasse crack stopping (preventions) to produce in engaging member (flange) before large-scale damage, can also before forming large-scale damage the brittlement crevasse crack that stopping (prevention) produces at attachment (web) the propagation to engaging member (flange), the welded structure of excellent brittlement crevasse crack propagation halt characteristic.
In addition, be that attachment (web) and engaging member (flange) are all more than thickness of slab 50mm and have butt joint portion as the welded structure of object in the present invention, and have and make the weld part end face in the butt joint portion of attachment (web) dock the welded structure of the fillet-welded joint engaged with engaging member by attachment by fillet welding with the weld part surface in the butt joint portion of engaging member (flange).
The present inventors is in order to realize above-mentioned object, the weld part end face in the butt joint portion by attachment (web) is docked with the weld part surface in the butt joint portion of engaging member (flange) and attachment and engaging member carried out the fillet-welded joint of fillet welding, furthers investigate with regard to the various key factors producing brittlement crevasse crack propagation halt characteristic.
It found that in the fillet-welded joint under stringent condition like this, the propagation of the brittlement crevasse crack produced from engaging member (flange) to stop (stopping), guarantees discontinuous portion only according at the interface of attachment (web) with engaging member (flange) and stops with the brittlement crevasse crack propagation with more than setting the parts of the excellent brittlement crevasse crack propagation halt characteristic of toughness Kca to be not enough to stop crevasse crack propagation to the structure of the communication portion forming brittlement crevasse crack.
If particularly in view of the thickness of slab t of engaging member (flange)
f(mm) increase, the situation that energy release rate (be full of cracks progress driving force) increases, brittlement crevasse crack not easily stops of brittlement crevasse crack front end, expects needing to improve the thickness of slab t with engaging member (flange)
f(mm) toughness in relevant fillet welding portion.
And also expect that brittlement crevasse crack is easily propagated if the leg length in fillet welding portion, deposition width are elongated, therefore need to make at least one party in the leg length in fillet welding portion or deposition width be below 16mm.
And then, also expecting that the toughness of the weld metal by making the butt joint portion of engaging member and/or attachment is formed as more than certain value, the welded structure with required brittlement crevasse crack propagation halt characteristic can be formed.
Namely, for attachment (web) and engaging member (flange), all there is butt joint portion, and make the fillet-welded joint that the weld part end face in the butt joint portion of attachment docks with the weld part surface in the butt joint portion of engaging member
Non-welded portion, the i.e. discontinuous portion of more than the length specified is guaranteed at interface,
And at least one party in the leg length of welded corner joint head or deposition width is formed as below 16mm,
And then, fillet welding portion toughness is formed as at the thickness of slab t with engaging member
f(mm) the relation aspect between meets the toughness of the relation of regulation,
And improve the toughness of the weld metal in the butt joint portion of attachment and/or engaging member,
Find the propagation that brittlement crevasse crack that be difficult to realization, that produce in the engaging member of the heavy wall of above-mentioned more than thickness of slab 50mm can be stoped in (stoppings) prior art to attachment thus.
And then, find the propagation that can stop the brittlement crevasse crack imported into from attachment to engaging member by applying flexibly above-mentioned idea too.
First, the experimental result as basis of the present invention is described.
The engaging member (flange) of the attachment (web) with heavy wall all with the heavy wall in butt joint portion is docked with the weld part end face in the butt joint portion of attachment (web) with the weld part surface in the butt joint portion of engaging member (flange) and made large-scale fillet-welded joint by the mode engaged.
In addition, formation makes non-welded portion ratio Y (%) (=(width B in the non-welded portion at the butt joint section place of fillet welding)/(the thickness of slab t of attachment
w) × 100) carry out various change and make fillet welding metal section toughness carry out the fillet-welded joint of various change by the adjustment of welding material and welding condition etc.In addition, at least one party in the leg length in fillet welding portion or weld width is below 16mm.
In addition, the steel plate that engaging member (flange) uses thickness of slab to be more than 50mm, attachment use does not consider that any brittlement crevasse crack propagation stops shipbuilding D ~ E level steel plate of common more than the thickness of slab 50mm of toughness Kca.And, use the large-line energy pneumoelectric arc-welding of single track (SEGARC or 2 electrode SEGARC) or carbon dioxide arc-welding (multiple tracks) to be that the mode that the Charpy-type test of less than-65 DEG C and/or-20 DEG C absorbs the toughness that energy is more than 140J makes butt joint to adjust welding material and welding condition etc. to make the weld metal in butt joint portion have the critical-temperature of Charpy-type test fracture transition all equally for engaging member, attachment.
Use the ultra-large type structural model test body shown in large-scale fillet-welded joint 9 construction drawing 3 (a) obtained, implement brittlement crevasse crack propagation and stop test.In addition, ultra-large type structural model test body welds the steel plate of the thickness of slab identical with engaging member (flange) 2 by prewelding 8 in the below of the engaging member (flange) 2 of large-scale fillet-welded joint 9.
In addition the ultra-large type structural model test body, shown in Fig. 3 (a) in section, forms same line with the butt joint portion 12 of attachment (web) 1 with the butt joint portion 11 of engaging member (flange) 2 and the mode orthogonal with molten tangent line is made.In addition, the mode becoming the BOND portion in the butt joint portion 11 of engaging member (flange) 2 with the front end of physical notches 7 is processed.
In addition, stop in test at brittlement crevasse crack propagation, give impact to physical notches 7 and make it to produce brittlement crevasse crack, whether the propagation investigating this brittlement crevasse crack stops in fillet welding portion.All tests are all at stress 257N/mm
2, temperature is implement under the condition of-10 DEG C.
In addition, stress 257N/mm
2for with the yield strength 390N/mm being applied to hull
2the suitable value of maximum allowable stress of level steel plate.In addition, the design temperature of temperature to be-10 DEG C be boats and ships.
Drawn result is shown in Fig. 4 (a), (b).
From Fig. 4 (a), (b), when non-welded portion ratio Y is more than 95% and the thickness of slab t of the toughness of fillet welding metal section and engaging member (flange)
frelation when meeting specific relation, even if bearing strength test is 257N/mm
2situation, any consideration need not be carried out to the Kca of attachment (web), the brittlement crevasse crack produced in engaging member (flange) can both be stopped by fillet welding portion, (stopping) brittlement crevasse crack can be stoped to the propagation of attachment (web).
In addition, at least one party in the leg length that Fig. 4 (a), (b) are fillet welding portion or deposition width is at below 16mm, and the weld metal in the butt joint portion of engaging member and/or attachment meets the situation of the toughness of regulation.
At this, non-welded portion ratio Y is docked by the weld part end face in the butt joint portion 12 by attachment (web) with the weld part surface in the butt joint portion 11 of engaging member (flange) and carries out width B and attachment (web) the thickness of slab t in the non-welded portion of the butt joint section of fillet welding
wratio according to (B/t
wthe value that) × 100 (%) define.
Based on the above results, as the toughness of welded corner joint head and the thickness of slab t of engaging member (flange)
fparticular kind of relationship, can draw from Fig. 4 (a)
vTrs(℃)≤-1.5t
f(mm)+90......(1)，
Draw from Fig. 4 (b)
vE
-20(J)≥2.75t
f(mm)-140......(2)。
Wherein, as the thickness of slab t of engaging member (flange)
fbe in 50≤t
f(mm)≤53 scope when, (2) formula is vE
-20(J)>=5.75.
In addition, if the thickness of slab t of engaging member (flange)
f(mm) increase, then the energy release rate (be full of cracks progress driving force) of brittlement crevasse crack front end increases, and brittlement crevasse crack not easily stops.But, for this point, if for having the welded structure (fillet-welded joint) that non-welded portion ratio Y is the discontinuous portion of structure of more than 95%, be then judged as that the energy release rate propagating the brittlement crevasse crack front end come reduces, the propagation of brittlement crevasse crack easily stops.
In addition, if improve fillet welding Metal until meet above formula (1), (2), find that the brittlement crevasse crack that in most cases can make to produce in the engaging member (flange) of the heavy wall of more than thickness of slab 50mm in fillet welding portion stops.
And then, even if find the propagation that cannot be stoped brittlement crevasse crack by above-mentioned fillet welding portion, by at least one party in the leg length in fillet welding portion or weld width being formed as below 16mm and the weld metal low-temperature flexibility in the butt joint portion of engaging member and/or attachment being formed as the toughness that specifies, brittlement crevasse crack also can be stoped in the propagation of the weld part (butt joint portion) of attachment (web).
Draw the following conclusions thus, that is: by implementing the countermeasure of raising of weld metal low-temperature flexibility in butt joint portion of the setting in non-welded portion, the raising of fillet welding portion low-temperature flexibility, the adjustment of the leg length in fillet welding portion or weld width, engaging member and/or attachment, even if not by considering that brittlement crevasse crack propagation stops the steel plate of toughness to be used for attachment (web) especially, the propagation of the brittlement crevasse crack produced in engaging member (flange) also can be stoped.
In addition, also find by implementing countermeasure same as described above, the weld part (butt joint portion) that can pass through fillet welding portion or engaging member (flange) stops the propagation of the brittlement crevasse crack imported into engaging member (flange) from attachment (web).
And then, also find the toughness of the weld metal in the butt joint portion of not just engaging member and/or attachment, the toughness of the toughness improving the heat affected zone in the butt joint portion of engaging member and/or attachment or the steel plate that forms them is also effective for the raising of brittlement crevasse crack propagation halt characteristic.
The present invention just based on above-mentioned idea in addition deep research complete.Namely purport of the present invention is as described below.
1. a welded structure, there is following fillet-welded joint, this fillet-welded joint is docked by the surface of the engaging member of the end face with more than thickness of slab 50mm that make the attachment of more than thickness of slab 50mm and is utilized fillet welding to be engaged with above-mentioned engaging member by above-mentioned attachment and formed, and at least one party in the leg length of above-mentioned fillet-welded joint or deposition width is the fillet-welded joint of below 16mm
The feature of above-mentioned welded structure is,
Above-mentioned attachment and above-mentioned engaging member are the parts with butt joint portion, and fracture transition critical-temperature vTrs-W (DEG C) that the weld metal in the butt joint portion of these attachment and/or this engaging member has a Charpy-type test is that the Charpy-type test of less than-65 DEG C and/or-20 DEG C absorbs energy vE
-20the toughness that-W (J) is more than 140J,
Docked with the weld part surface in the above-mentioned butt joint portion of above-mentioned engaging member by the weld part end face in the above-mentioned butt joint portion of the above-mentioned attachment at above-mentioned fillet-welded joint place, be the thickness of slab t of these attachment in the butt joint section that the mask of this docking has at above-mentioned fillet-welded joint
wmore than 95% non-welded portion,
And then for the fillet welding metal of above-mentioned fillet-welded joint,
Charpy-type test fracture transition critical-temperature vTrs (DEG C) of this fillet welding metal and the thickness of slab t of above-mentioned engaging member
fmeet the relation of following formula (1), and/or
The Charpy-type test of this fillet welding metal absorbs energy vE in the Charpy-type test that test temperature is-20 DEG C
-20(J) with the thickness of slab t of above-mentioned engaging member
fmeet the relation of following formula (2),
vTrs≤-1.5t
f+90......(1)
VE
-20(J)>=5.75, (wherein, 50≤t
f(mm)≤53),
VE
-20(J)>=2.75t
f(mm)-140, (wherein, t
f(mm) > 53) ... (2)
At this, vTrs is Charpy-type test fracture transition critical-temperature (DEG C) of fillet welding metal,
VE
-20the Charpy-type test being-20 DEG C in test temperature absorbs energy (J),
T
ffor the thickness of slab (mm) of engaging member.
2. the welded structure described in above-mentioned 1, it is characterized in that, the heat affected zone in the butt joint portion of above-mentioned attachment and/or above-mentioned engaging member has the Charpy-type test absorption energy vE that Charpy-type test fracture transition critical-temperature vTrs-H (DEG C) is less than-65 DEG C and/or-20 DEG C
-20the toughness that-H (J) is more than 140J.
3. the welded structure described in above-mentioned 1 or 2, it is characterized in that, the steel plate forming above-mentioned attachment and/or above-mentioned engaging member has the Charpy-type test absorption energy vE that Charpy-type test fracture transition critical-temperature vTrs-B (DEG C) is less than-65 DEG C and/or-20 DEG C
-20the toughness that-B (J) is more than 140J.
4. the welded structure described in above-mentioned 1, it is characterized in that, the weld metal in the butt welding portion of above-mentioned attachment and/or above-mentioned engaging member has the Charpy-type test absorption energy vE that Charpy-type test fracture transition critical-temperature vTrs-W (DEG C) is less than-85 DEG C and/or-20 DEG C
-20the toughness that-W (J) is more than 160J.
5. the welded structure described in above-mentioned 4, it is characterized in that, the heat affected zone in the butt joint portion of above-mentioned attachment and/or above-mentioned engaging member has the Charpy-type test absorption energy vE that Charpy-type test fracture transition critical-temperature vTrs-H (DEG C) is less than-85 DEG C and/or-20 DEG C
-20the heat affected zone of the toughness that-H (J) is more than 160J.
6. the welded structure described in above-mentioned 4 or 5, it is characterized in that, the steel plate forming above-mentioned attachment and/or above-mentioned engaging member has the Charpy-type test absorption energy vE that Charpy-type test fracture transition critical-temperature vTrs-B (DEG C) is less than-85 DEG C and/or-20 DEG C
-20the steel plate of the toughness that-B (J) is more than 160J.
According to the present invention, the propagation of brittlement crevasse crack that to stop being difficult in (preventions) prior art realization before large-scale damage, that produce in the engaging member (flange) be made up of the steel plate of more than thickness of slab 50mm to attachment (web) can formed.Thereby, it is possible to the danger of the large-scale brittle break avoiding the hull of steel structure, particularly Large Container Ship, bulk carrier etc. to be separated and so on, bring effect larger in the security guaranteeing Ship Structure, industrially play significant effect.In addition, according to the present invention, also have before generation large-scale damage, the effect that (prevention) propagates to engaging member (flange) at the brittlement crevasse crack that the attachment (web) be made up of the steel plate of more than thickness of slab 50mm produce can be stopped.
In addition, also there is following effect, that is: when constructing, by adjusting the size in non-welded portion, the toughness of fillet welding metal, the weld metal in butt joint portion of the leg length in fillet welding portion or weld width and engaging member and/or attachment, heat affected zone, forming the low-temperature flexibility of the steel plate of these parts, without the need to the special plate using brittlement crevasse crack propagation to stop tenacity excellent, the welded structure easily producing excellent brittlement crevasse crack propagation halt characteristic safely just can be can't harm.
Accompanying drawing explanation
The key diagram that Fig. 1 schematically illustrates for the structure all having the fillet-welded joint in butt joint portion to attachment (web) 1 and engaging member (flange) 2.A () is outside drawing, (b) is the sectional view cross-section structure of the fillet-welded joint of butt joint position being carried out to signal explanation.
Fig. 2 is the key diagram other 1 example of the cross-section structure of fillet-welded joint being carried out to signal explanation, and the situation of attachment (web) 1 and engaging member (flange) 2 diagonal cross is shown.
Fig. 3 is the key diagram of the shape schematically showing the ultra-large type structural model test body used in embodiment.A () illustrates that the situation that brittlement crevasse crack is propagated from engaging member (flange) 2 to attachment (web) 1, (b) illustrate the situation that brittlement crevasse crack is propagated from attachment (web) 1 to engaging member (flange) 2.
Fig. 4 is the curve map of the impact of the expression toughness of fillet welding metal that causes the brittlement crevasse crack propagation when propagating from engaging member (flange) 2 to attachment (web) 1 to stop and the relation of flange thickness of slab.
Detailed description of the invention
Welded structure of the present invention is the welded structure be combined into by the attachment (web) of more than the thickness of slab 50mm by all having butt joint portion and the engaging member (flange) of more than thickness of slab 50mm, is to make the weld part end face in the butt joint portion of attachment dock with the weld part surface in the butt joint portion of engaging member and be engaged by fillet welding.The outward appearance of 1 example of welded structure of the present invention shown in Fig. 1 (a).This welded structure has fillet-welded joint, and the fillet-welded joint at least one party had in leg length 3 or deposition width 13 is the fillet welding metal 5 of below 16mm.In addition, there is the non-welded portion 4 as constructing discontinuous portion at the attachment (web) 1 of this fillet-welded joint and the interface of engaging member (flange) 2.
Fillet welding joint section with butt joint position in Fig. 1 (b) Suo Shi illustrates above-mentioned state.In addition, Fig. 1 (b) illustrates by attachment (web) 1 relative to the vertically installed situation of engaging member (flange) 2, but is not limited thereto in the present invention.Such as, as shown in Figure 2, also attachment (web) 1 can be installed relative to engaging member (flange) 2 tilt angle theta.In this case, attachment (web) the thickness of slab t used when asking for ratio Y (%) in non-welded portion
wuse the length, (t of the cross part of attachment (web) and engaging member (flange)
w)/cos (90 ° of-θ).
As mentioned above, welded structure of the present invention to have with the interface of engaging member (flange) 2 at the attachment (web) 1 of fillet-welded joint and constructs discontinuous non-welded portion 4.In fillet-welded joint, when brittlement crevasse crack is propagated from engaging member (flange) 2 to attachment (web) 1, attachment (web) 1 will become the propagation face of brittlement crevasse crack with the interface of engaging member (flange) 2, therefore in the present invention, non-welded portion 4 is made to be present in interface.Because non-welded portion 4 exists, the energy release rate (be full of cracks progress driving force) propagating the brittlement crevasse crack front end come in engaging member (flange) 2 is reduced, and brittlement crevasse crack easily stops at interface.
In addition, even if brittlement crevasse crack is intended to propagate to attachment (web) 1 side, owing to forming the fillet welding portion (fillet welding metal 5) of the toughness keeping regulation above in the present invention, therefore brittlement crevasse crack easily stops at fillet welding portion (fillet welding metal 5).
In addition, brittlement crevasse crack situation about occurring in the less steel plate mother metal portion of defect is very rare.The brittle break accident majority in past occurs in weld part.Therefore, there is butt joint 12,11 and in the fillet-welded joint shown in the butt joint portion 11 of engaging member (flange) 2 Fig. 1 (a) orthogonal with the butt joint portion 12 of attachment (web) 1 at attachment (web) 1 and engaging member (flange) 2, in order to the brittlement crevasse crack stoping the brittlement crevasse crack produced from butt joint portion 11 to propagate to attachment (web) 1 or produce from butt joint portion 12 is propagated to engaging member (flange) 2, first importantly there is the discontinuous of structure.Therefore, in the present invention, non-welded portion 4 is made to be present in the attachment 1 at place of fillet welding portion and the interface of engaging member 2.
As shown in Fig. 1 (b), in the fillet-welded joint that the butt joint portion 11 of engaging member (flange) 2 is orthogonal with the butt joint portion 12 of attachment (web) 1, there is non-welded portion 4 with the interface of the weld part end face in butt joint portion 12 in the weld part surface in butt joint portion 11.
In addition, without the need to being particularly limited the manufacture method of fillet-welded joint, normally used any manufacture method can be applied.Such as, can pass through the butt welding each other of flange steel plate, the butt welding each other of web steel plate, and then the butt joint obtained is carried out fillet welding to manufacture.
In the present invention, butt joint position, the size (width B) in the non-welded portion 4 of fillet-welded joint section is set as web thickness of slab t to suppress the propagation of brittlement crevasse crack
wmore than 95%.Thus, fillet welding metal is easy to plastic deformation, and the stress near the be full of cracks front end alleviating the brittlement crevasse crack imported into welding fillet welding metal, can suppress brittlement crevasse crack to the propagation of attachment (web) 1 side.Therefore, the size (width B) in non-welded portion 4 is restricted to attachment (web) thickness of slab t
wmore than 95%.In addition, less than more than 96% 100% is preferably.
In addition, at least one party in the leg length 3 of fillet-welded joint or deposition width 13 is below 16mm.Thus, by the plastic deformation of fillet welding metal, the stress near the be full of cracks front end can alleviating the brittlement crevasse crack being transmitted to fillet welding metal, suppresses the propagation of brittlement crevasse crack.Therefore, the leg length of fillet-welded joint or deposition width are defined as easily deformable below the 16mm of the fillet welding metal of high tenacity.Be preferably below 15mm.From the view point of the rigidity of joint structure and welding, leg length 3 and deposition width 13 are preferably more than 4mm respectively.
In addition, when the thickness of slab of engaging member (flange) 2, attachment (web) 1 more than 80mm when, in order to ensure intensity, be preferably broadening leg length after the low-temperature flexibility improving fillet welding metal section.
In addition, in the present invention, the fillet welding metal of fillet-welded joint and the thickness of slab t of engaging member (flange) 2
frelevant can guarantee that the mode of the toughness meeting following formula (1) and/or following formula (2) adjusts.
vTrs≤-1.5t
f+90......(1)
VE
-20>=5.75 (wherein, 50≤t
f(mm)≤53),
VE
-20>=2.75t
f(mm)-140 (wherein, t
f(mm) > 53) ... (2)
(at this, vTrs is Charpy-type test fracture transition critical-temperature (DEG C) of fillet welding metal, vE
-20for the Charpy-type test of test temperature-20 DEG C time absorbs energy (J), t
fthickness of slab (mm) for engaging member (flange))
By the thickness of slab t by the toughness of fillet welding metal and engaging member (flange)
fbe correlated with and meet above formula (1) and/or above formula (2) formula, can as shown in Figure 4, the welded structure being more than 50mm by the thickness of slab of engaging member (flange) is formed as guaranteeing that required brittlement crevasse crack propagation stops the welded structure of characteristic.When the toughness of fillet welding metal does not meet above formula (1) and above formula (2) arbitrary condition, the toughness of fillet welding metal is not enough, cannot stop propagation by fillet welding metal section to producing in engaging member (flange) and propagating the brittlement crevasse crack come.
And then, in the present invention, in the butt joint portion of engaging member 2 and/or attachment 1, need to adjust the Charpy-type test absorption energy vE that welding material, welding condition take fracture transition critical-temperature vTrs-W (DEG C) making the weld metal in butt joint portion and have Charpy-type test as less than-65 DEG C and/or-20 DEG C
-20the toughness that-W (J) is more than 140J, thus form weld metal.
The weld metal in the butt joint portion of attachment 1 exceeds-65 DEG C and vE at vTrs-W (DEG C)
-20when-W (J) is less than 140J, cannot be stoped by fillet welding portion or attachment (web) weld part and propagate from engaging member (flange) weld part the brittlement crevasse crack of coming.Or the weld metal in the butt joint portion of engaging member 2 exceeds-65 DEG C and vE at vTrs-W (DEG C)
-20when-W (J) is less than 140J, cannot be stoped by fillet welding portion or engaging member (flange) weld part and propagate from the weld part of attachment the brittlement crevasse crack of coming.
In addition, the weld metal being more preferably the butt welding portion of attachment and/or engaging member has the Charpy-type test absorption energy vE that Charpy-type test fracture transition critical-temperature vTrs-W (DEG C) is less than-85 DEG C and/or-20 DEG C
-20the weld metal of the toughness that-W (J) is more than 160J.
In addition, in the present invention, be preferably, the weld metal in the butt joint portion of engaging member 2 and/or attachment 1 has above-mentioned toughness, and then heat affected zone has the Charpy-type test absorption energy vE that Charpy-type test fracture transition critical-temperature vTrs-H (DEG C) is less than-65 DEG C and/or-20 DEG C
-20the toughness that-H (J) is more than 140J.And then, be preferably the steel plate forming engaging member 2 and/or attachment 1 and there is the Charpy-type test absorption energy vE that Charpy-type test fracture transition critical-temperature vTrs-B (DEG C) is less than-65 DEG C and/or-20 DEG C
-20the toughness that-B (J) is more than 140J.The weld part of the weld part or engaging member (flange) that utilize these high tenacityization can pass more readily fillet welding portion or attachment (web) stops propagates the brittlement crevasse crack come or the brittlement crevasse crack come from the propagation of attachment (web) weld part from engaging member (flange) weld part.
In addition, the heat affected zone being more preferably the butt joint portion of attachment and/or engaging member is that to have vTrs-H (DEG C) be less than-85 DEG C and/or vE
-20the heat affected zone of the toughness that-H (J) is more than 160J.In addition, being more preferably the steel plate forming engaging member and/or attachment, to have vTrs-B (DEG C) be less than-85 DEG C and/or vE
-20the toughness that-B (J) is more than 160J.
Welded structure of the present invention has above-mentioned fillet-welded joint and above-mentioned butt joint, such as, can be applied to using the ship hull plate of boats and ships as flange, partition wall is as the Ship Structure of web or using deck as flange, hatch as the Ship Structure etc. of web.
Below, based on embodiment, the present invention is described in detail.
Embodiment
To there is the steel plate of the thickness of slab shown in table 1 and 2, low-temperature flexibility, use the welding method shown in table 1 and 2 and make butt joint with the weld heat input shown in table 1 and 2, being formed as engaging member 2, attachment 1 respectively.In addition, butt welding adopt the weld heat input shown in table 1 and 2, single track large-line energy pneumoelectric arc-welding (SEGARC and 2 electrode SEGARC) or multi-layer C O
2welding, makes welding material change and carries out.
With in the butt joint portion from the attachment drawn and engaging member, test film surface be 1mm or 2mm under top layer, test film long side direction and breach vertical with molten tangent line towards the mode in the direction vertical with molten tangent line, obtain V-notch Charpy-type test sheet (10mm is thick) from weld metal central portion, heat affected zone (BOND portion).
Charpy-type test is carried out based on the benchmark of JISZ2242, tries to achieve fracture transition critical-temperature vTrs (DEG C) and absorbs energy vE at the Charpy impact that test temperature is-20 DEG C
-20(J).In addition, for the mother metal portion of steel plate forming attachment and engaging member, also by trying to achieve vE
-20(J), fracture transition critical-temperature vTrs (DEG C).
Gather the steel plate mother metal low-temperature flexibility and butt joint portion low-temperature flexibility that draw and shown in shown in table 1 and 2.
Then, after weld part end face in the butt joint portion 12 by attachment (web) 1 docks with the weld part surface in the butt joint portion 11 of engaging member (flange) 2, fillet welding is carried out to attachment 1 and engaging member 2, the large-scale fillet-welded joint of the practical structures size of the shape shown in construction drawing 3 (a), (b).The welding condition of welding material and weld heat input, protective gas etc. is changed and carries out fillet welding, to form the fillet-welded joint with various weld metal toughness, various leg lengths or the deposition width shown in table 3 and 4.
In addition, in the large-scale fillet-welded joint made, make the non-welded portion 4 existed between the face of docking attachment 1 and engaging member 2 shown in Fig. 1 (b) or Fig. 2, and as shown in table 3 and 4, make ratio Y (=(width B/attachment (web) the thickness of slab t in the non-welded portion of the butt joint section of fillet welding in non-welded portion
w× 100) change.
In addition, from the fillet welding metal of the large-scale fillet-welded joint drawn or obtain v v notch v Charpy-type test sheet (10mm is thick) from the butt joint made with the condition identical with fillet welding, based on the benchmark of JISZ2242, obtain the absorption energy vE that test temperature is-20 DEG C
-20(J), fracture transition critical-temperature vTrs (DEG C).The low-temperature flexibility of the fillet welding metal 5 that can draw is shown in table 3 and 4.
Then, use the ultra-large type structural model test body shown in large-scale fillet-welded joint construction drawing 3 drawn, implement brittlement crevasse crack propagation and stop test.
Ultra-large type structural model test body shown in Fig. 3 (a) is for making the butt joint portion 11 of engaging member (flange) 2 orthogonal with the butt joint portion 12 of attachment (web) 1, and the situation of brittlement crevasse crack is propagated from engaging member (flange) 2 to attachment (web) 1, the mode in the BOND portion being butt joint portion 11 with the front end of physical notches 7 is processed.
Ultra-large type structural model test body shown in Fig. 3 (b) is for making the butt joint portion 12 of attachment (web) 1 orthogonal with the butt joint portion 11 of engaging member (flange) 2, and the situation of brittlement crevasse crack is propagated from attachment (web) 1 to engaging member (flange) 2, the mode in the BOND portion being butt joint portion 12 with the front end of physical notches 7 is processed.
In addition, the ultra-large type structural model test body shown in Fig. 3 (a) welds the steel plate of the thickness of slab identical with engaging member (flange) 2 by prewelding 8 in the below of the engaging member (flange) 2 of large-scale fillet-welded joint 9.In addition, ultra-large type structural model test body shown in Fig. 3 (b) welds the accessory plate 6 of the thickness of slab identical with attachment (web) 1 by part groove welding 10 in the below of the engaging member (flange) 2 of large-scale fillet-welded joint 9, and then welded the steel plate of the thickness of slab identical with attachment (web) 1 by prewelding 8 in the below of accessory plate 6.
Brittlement crevasse crack propagation stops in test, give to impact to physical notches 7 and make it to produce brittlement crevasse crack, whether the brittlement crevasse crack that investigation is propagated can in fillet welding portion or attachment weld part (comprising heat affected zone) (Fig. 3 (a)) or weld part (comprising heat affected zone) (Fig. 3 (b)) stopping of engaging member.
All tests are all with stress 100 ~ 283N/mm
2, temperature be-10 DEG C condition implement.Stress 100N/mm
2for homeostatic process is in the average value of the stress of hull.In addition, stress 257N/mm
2for with the yield strength 390N/mm being applied to hull
2the suitable value of maximum allowable stress of level steel plate.And then, stress 283N/mm
2for with the yield strength 460N/mm being applied to hull
2the suitable value of maximum allowable stress of level steel plate.Temperature-10 DEG C is the design temperature of boats and ships.
The result drawn is shown in Table 5.
[table 1]
[table 2]
[table 3]
[table 4]
[table 5]
Table 5
When propagating brittlement crevasse crack from engaging member (flange) to attachment (web), the present invention's example all makes the fillet welding metal of brittlement crevasse crack in fillet welding portion or attachment (web) weld part stop.In addition, when propagating brittlement crevasse crack from attachment (web) to engaging member (flange), the present invention's example also all makes the fillet welding metal of brittlement crevasse crack in fillet welding portion or engaging member (flange) weld part stop.
On the other hand, when leg length, deposition width both sides are all in extraneous comparative example of the present invention (test body No.19 ~ No.21), brittlement crevasse crack does not stop at the weld part of fillet welding portion, attachment or the weld part of engaging member, propagate to attachment or engaging member, the propagation of (stopping) brittlement crevasse crack cannot be stoped.
In addition, when non-welded portion ratio Y is in comparative example (test body No.22 ~ No.24, No.27) outside scope of the present invention, the brittlement crevasse crack produced in engaging member is propagated to attachment, cannot stop the propagation of (stopping) brittlement crevasse crack.
And then, when the attachment of effect of propagation stopping and the weld metal low-temperature flexibility in the butt joint portion of engaging member that play brittlement crevasse crack are in extraneous comparative example of the present invention (test body No.26, No.28), brittlement crevasse crack is propagated from engaging member to attachment, cannot stop the propagation of (stopping) brittlement crevasse crack.
And, when fillet welding Metal is in extraneous comparative example of the present invention (test body No.25, No.29, No.30, No.32, No.33), brittlement crevasse crack is propagated from engaging member to attachment or is propagated to engaging member from attachment, cannot stop the propagation of (stopping) brittlement crevasse crack.
In addition, when non-welded portion ratio Y and fillet welding portion low-temperature flexibility are all in extraneous comparative example (test body No.31) of the present invention, the brittlement crevasse crack produced in engaging member is propagated to attachment, cannot stop the propagation of (stopping) brittlement crevasse crack.
Wherein, description of reference numerals is as follows:
1: attachment (web); 2: engaging member (flange); 3: leg length; 4: non-welded portion; 5: fillet welding metal; 6: accessory plate; 7: physical notches; 8: prewelding; 9: large-scale fillet-welded joint; 10: part groove welding; 11: the butt joint portion of engaging member (flange); 12: the butt joint portion of attachment (web); 13: deposition width; θ: the angle of the crossing.
Claims (6)
1. a welded structure, there is following fillet-welded joint, this fillet-welded joint is docked by the surface of the engaging member of the end face with more than thickness of slab 50mm that make the attachment of more than thickness of slab 50mm and is utilized fillet welding to be engaged with described engaging member by described attachment and formed, and at least one party in the leg length of described fillet-welded joint or deposition width is below 16mm
The feature of described welded structure is,
Described attachment and described engaging member are the parts with butt joint portion, and fracture transition critical-temperature vTrs-W (DEG C) that the weld metal in the butt joint portion of these attachment and/or this engaging member has a Charpy-type test is that the Charpy-type test of less than-65 DEG C and/or-20 DEG C absorbs energy vE
-20the toughness that-W (J) is more than 140J,
Docked with the weld part surface in the described butt joint portion of described engaging member by the weld part end face in the described butt joint portion of the described attachment at described fillet-welded joint place, be the thickness of slab t of these attachment in the butt joint section that the mask of this docking has at described fillet-welded joint
w's
The non-welded portion of more than 95%,
And then for the fillet welding metal of described fillet-welded joint,
Charpy-type test fracture transition critical-temperature vTrs (DEG C) of this fillet welding metal and the thickness of slab t of described engaging member
fmeet the relation of following formula (1), and/or
The Charpy-type test of this fillet welding metal absorbs energy vE in the Charpy-type test that test temperature is-20 DEG C
-20(J) with the thickness of slab t of described engaging member
fmeet the relation of following formula (2),
vTrs≤-1.5t
f+90……(1)
VE
-20(J)>=5.75, wherein, 50≤t
f(mm)≤53,
VE
-20(J)>=2.75t
f(mm)-140, wherein, t
f(mm) > 53 ... (2)
At this, vTrs is Charpy-type test fracture transition critical-temperature (DEG C) of fillet welding metal,
VE
-20for in test temperature being Charpy-type test absorption energy (J) of-20 DEG C,
T
ffor the thickness of slab (mm) of engaging member.
2. welded structure according to claim 1, is characterized in that,
The heat affected zone in the butt joint portion of described attachment and/or described engaging member has the Charpy-type test absorption energy vE that Charpy-type test fracture transition critical-temperature vTrs-H (DEG C) is less than-65 DEG C and/or-20 DEG C
-20the toughness that-H (J) is more than 140J.
3. welded structure according to claim 1 and 2, is characterized in that,
The steel plate forming described attachment and/or described engaging member has the Charpy-type test absorption energy vE that Charpy-type test fracture transition critical-temperature vTrs-B (DEG C) is less than-65 DEG C and/or-20 DEG C
-20the toughness that-B (J) is more than 140J.
4. welded structure according to claim 1, is characterized in that,
The weld metal in the butt joint portion of described attachment and/or described engaging member has the Charpy-type test absorption energy vE that Charpy-type test fracture transition critical-temperature vTrs-W (DEG C) is less than-85 DEG C and/or-20 DEG C
-20the toughness that-W (J) is more than 160J.
5. welded structure according to claim 4, is characterized in that,
The heat affected zone in the butt joint portion of described attachment and/or described engaging member has the Charpy-type test absorption energy vE that Charpy-type test fracture transition critical-temperature vTrs-H (DEG C) is less than-85 DEG C and/or-20 DEG C
-20the heat affected zone of the toughness that-H (J) is more than 160J.
6. the welded structure according to claim 4 or 5, is characterized in that,
The steel plate forming described attachment and/or described engaging member has the Charpy-type test absorption energy vE that Charpy-type test fracture transition critical-temperature vTrs-B (DEG C) is less than-85 DEG C and/or-20 DEG C
-20the steel plate of the toughness that-B (J) is more than 160J.
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| JP2012-108136 | 2012-05-10 | ||
| JP2012108136 | 2012-05-10 | ||
| PCT/JP2013/002981 WO2013168429A1 (en) | 2012-05-10 | 2013-05-09 | Welded structure |
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| KR (1) | KR101504242B1 (en) |
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| KR101622676B1 (en) * | 2014-04-17 | 2016-05-20 | 대우조선해양 주식회사 | Apparatus and method for large volume butt joint welding |
| CN107405713B (en) * | 2015-03-12 | 2019-11-05 | 杰富意钢铁株式会社 | Welded structure |
| CN105014205A (en) * | 2015-07-17 | 2015-11-04 | 江西洪都航空工业集团有限责任公司 | Corner butt joint TIG welding method |
| CN109311126B (en) * | 2016-06-16 | 2021-03-26 | 杰富意钢铁株式会社 | Welded structure having excellent brittle crack propagation stopping characteristics |
| WO2017217516A1 (en) * | 2016-06-16 | 2017-12-21 | Ｊｆｅスチール株式会社 | Welded structure having excellent brittle crack arrest characteristics |
| CN111032266B (en) * | 2018-05-18 | 2020-11-24 | 日本制铁株式会社 | Welded structure |
| WO2020136777A1 (en) * | 2018-12-26 | 2020-07-02 | 日本製鉄株式会社 | Welded structure |
| KR20230158578A (en) | 2021-06-15 | 2023-11-20 | 제이에프이 스틸 가부시키가이샤 | welded structure |
| WO2023007860A1 (en) * | 2021-07-26 | 2023-02-02 | 日本製鉄株式会社 | Welding structure, method for designing same, and method for constructing same |
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| Publication number | Publication date |
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| WO2013168429A1 (en) | 2013-11-14 |
| JPWO2013168429A1 (en) | 2016-01-07 |
| KR101504242B1 (en) | 2015-03-19 |
| BR112014025358B1 (en) | 2019-01-15 |
| CN104271301A (en) | 2015-01-07 |
| PH12014501936B1 (en) | 2014-11-24 |
| JP5408396B1 (en) | 2014-02-05 |
| KR20140126778A (en) | 2014-10-31 |
| PH12014501936A1 (en) | 2014-11-24 |
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