CN1871094A - High heat input butt welding joint exhibiting excellent characteristics in resistance to occurrence of brittle fracture - Google Patents
High heat input butt welding joint exhibiting excellent characteristics in resistance to occurrence of brittle fracture Download PDFInfo
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- CN1871094A CN1871094A CN200480030878.4A CN200480030878A CN1871094A CN 1871094 A CN1871094 A CN 1871094A CN 200480030878 A CN200480030878 A CN 200480030878A CN 1871094 A CN1871094 A CN 1871094A
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Abstract
A high heat input butt welding joint exhibiting excellent characteristics in the resistance to the occurrence of brittle fracture which is a butt welding joint in a welded structure, characterized in that (a1) a weld metal has a hardness being 110 % or less relative to that of a base material, or (a2) a weld metal has a hardness being 70 to 110 % relative to that of a base material, and optionally, (b) a weld metal has a width being 70 % or less relative to the thickness of a base plate, (c) the region of a weld heat affected zone being so softened as to have a hardness being 95 % or less relative to that of the base material zone not affected by heat has a width of 5 mm or more, and/or (d) the weld-affected zone (HAZ) adjacent to a weld melt line has an old austenite grain diameter of 200 mum or less.
Description
Technical field
The good large-line energy butt welded joint of anti-brittle fracture occurrence features of the welding structural body that the present invention relates to the steel plate of the thick 50mm of surpassing of welding structural body, particularly butt welding fishplate bar and constitute.
Background technology
For welding structural body, the highest position of fracture possibility occurrence is the welding point part.Can enumerate as its reason: weld defect takes place during welding, this defective becomes the possibility height of concentrating portion as the stress of fracture starting point, organize thickization because of the steel plate that influences of sweating heat in addition, reduce as the employed fracture toughness value of the index Kc relevant etc. with the brittle fracture of welded-joint.
Therefore, to concentrate in order stoping in welded-joint distortion and strain, to make the intensity and the hardness ratio mother metal height of weld metal, is form welding point basic, and when selected weld metal, adopting to compare with strength of parent becomes super joint design of mating.
Test as the fracture toughness value of estimating welding point has the stramazon test, that is: as shown in Figure 4, on the position of most fragile portion of the central portion of the test film of the standard fabric width 400mm that weld metal 2 is clipped in central authorities, supposition welding point, machining goes out the otch 3 of full-length 240mm, and such test film is stretched along the direction of arrow.
But, up to now,, can comment on hull steel plate necessary performance, characteristic according to its result by the main fracture toughness value of estimating the welding point of thickness of slab 50mm or the ship structure steel plate below it of this test.
The result has developed the steel plate (TMCP steel plate) (for example, opening flat 6-88161 communique with reference to the spy) of brittle fracture characteristic and material of excellent fatigue characteristics as the hull steel plate of the fracture toughness value of having considered weld part.
Up to now, TMCP steel plate in the construction of oilburg and 6000TEU or the container ship below it about use thickness of slab 50mm etc., but, the demand of building 6000TEU or its above Large Container Ship in recent years increases, its result, the steel plate of thickness of slab 60mm and above thickness of slab thereof also is practical with structural steel and iron as hull.
Now, the hull that is practical is the level of 390Mpa with the upper limit of the intensity of structural steel and iron by yield strength, still, when the size of container ship further increases, must use thicker (for example the surpassing 50mm's) steel plate of thickness of slab.
But, if the steel plate thickness of slab too increases, then exist number in man-hour in the welding procedure to increase, construction cost rises, the industrial problems such as weight increase of container ship itself.
Summary of the invention
The maximization of the welded structure of container ship etc. constantly makes progress, and in the construction of the container ship that surpasses 6000TUE, expectation uses thickness of slab to surpass 50mm and the high high-tensile strength steel plate of design stress is built container ship.
Therefore, the inventor sets about from the angle that welded-joint can become the highest position of possibility that fracture takes place, has investigated the performance that the large-line energy welding point of thickness of slab 50mm or its above steel plate has been welded in butt joint.
It found that, the large-line energy welding point of 50mm or its above steel plate has been welded in butt joint, though in as the v-notch Charpy-type test of small-scale test, show good result, in stramazon test, may not show good fracture toughness value Kc as large-scale destructive test.
Therefore, the present invention is the hull welding high-strength steel sheet that 460Mpa level, thickness of slab surpass 50mm according to above-mentioned opinion with the butt joint welding buckling strength, and forming the sufficiently high welding point of fracture toughness value Kc is problem.
In order to solve above-mentioned problem, the inventor studies the engineering properties of mother metal and welding point.The inventor has found a kind of new joint design technology as a result, and be not limited in the past joint design, described joint design in the past to be meant in order stoping in welded-joint distortion and strain and to concentrate, and so that the intensity of the intensity of weld metal and hardness ratio mother metal and hardness are high as forming the basic of welding point, comparing with strength of parent when selected weld metal becomes the such joint design in the past of super coupling.
That is to say that the inventor finds, in the joint design of large-line energy butt welded joint, so that the hardness of weld metal
(a1) mother metal hardness 110% or below it, perhaps
(a2) mother metal hardness 70% or more than it, 110% or mode below it control (joint design that becomes low coupling), in addition, as required,
(b) make the width of weld metal be the mother metal thickness of slab 70% or below it,
Thus, can prevent the reduction of the strength of joint that causes because of low coupling.
And, according to above-mentioned finding, in yield strength is in the large-line energy butt joint welding of 460Mpa level, the thickness of slab high-strength steel plate that surpasses 50mm (be preferably greater than 50mm smaller or equal to 70mm about), as the technology of the high welding point of specific implementation fracture toughness value Kc, has finished the present invention.
Main idea of the present invention is as described below.
(1) the good large-line energy butt welded joint of a kind of anti-brittle fracture occurrence features is the butt welded joint of welding structural body, it is characterized in that,
(a1) hardness of weld metal be mother metal hardness 110% or below it.
(2) the good large-line energy butt welded joint of a kind of anti-brittle fracture occurrence features is the butt welded joint of welding structural body, it is characterized in that,
(a2) hardness of weld metal be mother metal hardness 70% or it is above, 110% or below it.
(3) the good large-line energy butt welded joint of a kind of anti-brittle fracture occurrence features is the butt welded joint of welding structural body, it is characterized in that,
(a1) hardness of weld metal be mother metal hardness 110% or below it, and,
(b) width of weld metal be the mother metal thickness of slab 70% or below it.
(4) the good large-line energy butt welded joint of a kind of anti-brittle fracture occurrence features is the butt welded joint of welding structural body, it is characterized in that,
(a2) hardness of weld metal be mother metal hardness 70% or it is above, 110% or below it, and,
(b) width of weld metal be the mother metal thickness of slab 70% or below it.
(5) the good large-line energy butt welded joint of a kind of anti-brittle fracture occurrence features is the butt welded joint of welding structural body, it is characterized in that,
(a1) hardness of weld metal be mother metal hardness 110% or below it,
(b) width of weld metal be the mother metal thickness of slab 70% or below it, and,
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it.
(6) the good large-line energy butt welded joint of a kind of anti-brittle fracture occurrence features is the butt welded joint of welding structural body, it is characterized in that,
(a2) hardness of weld metal be mother metal hardness 70% or it is above, 110% or below it,
(b) width of weld metal be the mother metal thickness of slab 70% or below it, and,
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it.
(7) the good large-line energy butt welded joint of a kind of anti-brittle fracture occurrence features is the butt welded joint of welding structural body, it is characterized in that,
(a1) hardness of weld metal be mother metal hardness 110% or below it,
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it, and,
(d) the original austenite grain diameter of the weld affected zone (HAZ) that is connected with the welding melt run is at 200 μ m or below it.
(8) the good large-line energy butt welded joint of a kind of anti-brittle fracture occurrence features is the butt welded joint of welding structural body, it is characterized in that,
(a2) hardness of weld metal be mother metal hardness 70% or it is above, 110% or below it,
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it, and,
(d) the original austenite grain diameter of the weld affected zone (HAZ) that is connected with the welding melt run is at 200 μ m or below it.
(9) the good large-line energy butt welded joint of a kind of anti-brittle fracture occurrence features is the butt welded joint of welding structural body, it is characterized in that,
(a1) hardness of weld metal be mother metal hardness 110% or below it,
(b) width of weld metal be the mother metal thickness of slab 70% or below it,
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it, and,
(d) the original austenite grain diameter of the weld affected zone (HAZ) that is connected with the welding melt run is at 200 μ m or below it.
(10) the good large-line energy butt welded joint of a kind of anti-brittle fracture occurrence features is the butt welded joint of welding structural body, it is characterized in that,
(a2) hardness of weld metal be mother metal hardness 70% or it is above, 110% or below it,
(b) width of weld metal be the mother metal thickness of slab 70% or below it,
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it, and,
(d) the original austenite grain diameter of the weld affected zone (HAZ) that is connected with the welding melt run is at 200 μ m or below it.
(11) the good large-line energy butt welded joint of the described anti-brittle fracture occurrence features of each of above-mentioned (1)～(10) is characterized in that, above-mentioned welding structural body is the welding structural body of the high-strength steel sheet of the thick 50mm of surpassing of butt welding fishplate bar.
According to the present invention, can form the butt joint welding buckling strength is that 460Mpa level, thickness of slab surpass the high-strength steel sheet of 50mm, the abundant high welding point of fracture toughness value Kc when particularly the hull welding is with high-strength steel sheet.
Description of drawings
The figure of Fig. 1 influence that to be expression weld metal and mother metal hardness bring to the Kc value.
Fig. 2 be explanation influence the weld metal of strength of joint and mother metal hardness ratio and with the figure of the relation of weld width.
Fig. 3 represents: for the test film of thickness of slab 70mm, boundary portion (FL) and welding heat affected zone (HAZ) at weld metal (WM) and welding heat affected zone (HAZ) are provided with otch, the CTOD that resolves at the otch front end with FEM (3 dimension limited factors method) (Crack Tip OpeningDisplacement: the displacement of be full of cracks end opening) leave result's the example of each locational be full of cracks opening stress distribution of predetermined distance when becoming 0.05mm from otch front end edge be full of cracks propagation direction.
Fig. 4 is the figure of expression stramazon test film.
The specific embodiment
Up to now, concentrate in order to stop in welded-joint distortion and strain, the design basis of welding point is intensity and the hardness ratio mother metal height that makes weld metal, and welding material is to compare with strength of parent with its intensity to become selecting like that of super coupling.
Therefore, the inventor studies the steel plate that yield strength is the 460Mpa level, becomes the welding material making welding point that super coupling is selected like that with weld metal, by its engineering properties of stramazon test evaluation.
Its result, although above-mentioned welding point is in the v-notch Charpy-type test of its welded-joint, under-20 ℃ test temperature, show 90J or the sufficient value more than it, and fracture transition temperature also demonstrates-20 ℃ of so extremely good values, but shows but that in the stramazon test fracture toughness value Kc is 2000N/mm1.5 or such extremely low value below it.
That is to say that the inventor has obtained having broken away from greatly the result of the test of well-known " dependency relation of v-notch Charpy-type test result and stramazon result of the test ".
Therefore, investigated the fracture origination point in the stramazon test in minute detail, the inventor finds out as a result:
(i) Duan Lie occurrence positions is the border (welding melt run " FL ") of weld metal (WM) and heat affected area (HAZ), and
(ii) the microstructure of the part that takes place of fracture is identical with the microstructure of fracture generating unit observed in the Charpy-type test sheet.
And then the inventor has resolved the distributional pattern that becomes the local stress of fracture driving force in stramazon test and the Charpy-type test with the limited factors method of 3 dimensions, found that:
(iii) the distributional pattern of the local stress in stramazon test and the Charpy-type test is significantly different.
Fig. 3 represents: for the test film of thickness of slab 70mm, boundary portion (FL) and welding heat affected zone (HAZ) at weld metal (WM) and welding heat affected zone (HAZ) are provided with otch, the CTOD that resolves at the otch front end with FEM (3 dimension limited factors method) (Crack Tip OpeningDisplacement: the displacement of be full of cracks end opening) leave result's the example of each locational be full of cracks opening stress distribution of predetermined distance when becoming 0.05mm from otch front end edge be full of cracks propagation direction.
Can distinguish by this figure, (iv) when thickness of slab reaches the 70mm left and right sides above 50mm, the constraint degree of thickness of slab direction (power) enlarges markedly, when the intensity of the strength ratio mother metal (BM) of weld metal (WM) and welding heat affected zone (HAZ) is high (occasion of WM-H), local stress enlarges markedly (among the figure with reference to mouthful " WM-H " and a ■ " WM-L ") on the border of weld metal (WM) and welding heat affected zone (HAZ).
On the other hand, even the high occasion (occasion of WM-H) of intensity at the strength ratio mother metal (BM) and the welding heat affected zone (HAZ) of weld metal (WM), also do not increase in welding heat affected zone (HAZ) local stress, the occasion low with the intensity of weld metal (WM) (occasion of WM-L) is identical substantially.
Can think thus, the reason that the Kc value reduces, be because when the intensity of the strength ratio mother metal (BM) of weld metal (WM) and welding heat affected zone (HAZ) is high (occasion of WM-H), local stress is in the increase of the border of weld metal (WM) and welding heat affected zone (HAZ).
That is to say that the result of above-mentioned parsing, the inventor find, (v) for the local stress on the border that suppresses weld metal (WM) and welding heat affected zone (HAZ) enlarge markedly, improve the Kc value, must reduce the intensity of weld metal (WM) as far as possible.
Here, based on above-mentioned analysis result, make the hardness (Hv (WM)) of weld metal carry out various variations, measure fracture toughness value Kc, the Kc measured value is carried out diagram with respect to " hardness [Hv (BM)] of the hardness of weld metal [Hv (WM)]/mother metal ", found that shown in " ● " among Fig. 1, as long as the hardness [Hv (WM)] of weld metal is controlled at mother metal hardness [Hv (BM)] 110% or below it, just can prevent the reduction of the fracture toughness value that the increase by local stress causes.
Hence one can see that, make the hardness [Hv (WM)] of weld metal lower than the hardness [Hv (BM)] of mother metal, be for the fracture toughness value Kc that improves welding point necessary, but, when the hardness [Hv (WM)] of weld metal reduces, on the other hand, can not guarantee the intensity (tensile strength) of welding point, will cause as works and the fatal problem of structure.
Therefore, even in order to guarantee also that for welding point intensity with mother metal has the intensity of same degree, experimental study the low intensity limit of necessary weld metal.It found that, as shown in Figure 2, the influence of the width of weld metal (weld width) is significant, as long as with this width be limited to thickness of slab 70% or below it, even the hardness [Hv (WM)] of weld metal is reduced to mother metal hardness [Hv (BM)] 70%, also can guarantee the intensity (tensile strength) of welding point.
As previously mentioned, in order to ensure the fracture toughness value Kc that stipulates in the welding point, it is vital that the local stress of locating as the most fragile welding melt run (FL) partly of welding point is not increased, but simultaneously, the anti-brittle fracture occurrence features that improves near the microcosmic of FL also is important.
The mechanism of brittle fracture takes place in investigation near FL, the result finds out, upper bainite that analyse ferrite peripheral generate first of original austenite, generates in original austenite inside with lath-shaped and ferrite side plate etc. become the starting point of fracture, and find, by the original austenite grain diameter being suppressed just can improve anti-brittle fracture occurrence features for small size.
According to the inventor's experimental result, will be 200 μ m or below it preferably with the original austenite grain diameter inhibition of welding melt run (FL) welding heat affected zone (HAZ) that be connected.
In addition, the inventor finds that the generation and even the distribution of local stress are arranged by the hardness of weld metal in the welding melt run (FL) that is connected with weld metal, but " softening zone " bigger occasion in the HAZ district that is connected with FL, the local stress of FL has the tendency of mitigation.
According to the inventor's result of the test, owing to exist 5mm or the occasion more than it just can think above-mentioned mitigation phenomenon is arranged, so the softening width of preferred HAZ is at 5mm or more than it at the softening width of HAZ.
As long as the hardness of the hardness ratio mother metal in HAZ district is low, local stress just reduces from the principle, but according to the inventor's experimental result, can recognize effect that local stress reduces clearly, be hardness low 5% or the occasion more than it of the hardness ratio mother metal in HAZ district.
Therefore, preferably make the width of welding heat affected area of 95% or its following hardness of softening hardness to the mother metal portion that is not influenced by heat at 5mm or more than it in the present invention.
Welding structural body that the present invention is used and planking high-strength steel sheet can be made with structural steel by the welding that known one-tenth is grouped into.
For example, in quality %, with C:0.02～0.20%, Si:0.01～1.0%, Mn:0.3～2.0%, Al:0.001～0.20%, N:0.02% or below it, P:0.01% or below it, S:0.01% or below it as basis, according to the desired character such as raising of strength of parent and joint toughness, preferably contain a kind or 2 kinds or its above steel among Ni, Cr, Mo, Cu, W, Co, V, Nb, Ti, Zr, Ta, Hf, REM, Y, Ca, Mg, Te, Se, the B.
The thickness of slab of steel plate does not limit especially, surpasses the high-strength steel sheet that the large-scale planking of 50mm is used but the present invention preferably is applicable to thickness of slab for example.
In addition, as long as welding material can satisfy the characteristic of the present invention's regulation, its chemical composition and welding method are not limited.
In addition, as the preferred following scope of the chemical composition of welding material: C:0.01～0.06%, Si:0.2～1.0%, Mn:0.5～2.5%, Ni:0～4.0%, Mo:0～0.30%, Al:0～0.3%, Mg:0～0.30%, Ti:0.02～0.25%, B:0～0.050%, but also can consider chemical composition of steel, as long as select aptly.
Can use VEGA (1 electrode swing type carbon dioxide gas arc welding), YEGA-II (2 electrode swing type carbon dioxide gas arc welding), EG (carbon dioxide gas arc welding) and SAW (submerged-arc welding) as welding method.
For example, when using YGA-II, in occasion, with voltage 42V, electric current 390A, speed of welding 4.2m/ branch, weld heat input 450kJ/cm or weld more than it with the steel plate of the welding rod of 2 above-mentioned chemical composition scopes welding thickness of slab 70mm.In addition, preferred bevel angle is that 20 °, groove width are that 33mm, root gap of weld are 8mm.
In addition, in the occasion of welding the steel plate of thickness of slab 70mm, use the welding rod of diameter 4.8mm with SAW, carry out the multilayer welding with electric current 650A, voltage 33V, speed of welding 60cm/ branch, perhaps use copper and asbestos with back side packing in addition, further improve electric current, carry out the large-line energy welding.
At CO
2The occasion of protection welding; for example; use the welding rod of diameter 1.4mm; to weld about electric current 200～450A; but this is an example; as long as select suitable welding condition, with hardness, the weld width of weld metal be controlled at the present invention's regulation decide in the scope, just can obtain effect of the present invention.
The result; as long as really hardness, the weld width of weld metal is controlled at the present invention's regulation decide in the scope; welding condition is not just done special restriction; but; because the width of weld seam becomes thickness of slab or more than it during with deflection type electrode type carbon dioxide gas arc welding etc., thus this occasion just
Beyond the scope of invention.
Owing to easily welded seam is controlled at thickness of slab or below it with laser weld and electron beam welding, so as long as with the width of welded seam with the hardness of weld metal be controlled at the present invention's regulation decide in the scope, this occasion is with regard within the scope of the invention.
But, usually in welding without welding material, become only by the fusion of mother metal part, the weld metal that process of setting forms, because the hardness of weld metal is easily than mother metal height, so as long as the hardness of weld metal the present invention's regulation decide beyond the scope of scope, just beyond scope of the present invention.
Embodiment
Below, according to embodiment the present invention is described, but being the present invention, the condition among the embodiment is used to confirm the possibility implemented and effect and a kind of condition example of adopting, the invention is not restricted to this a kind of condition example.
The present invention only otherwise break away from main idea of the present invention, reaches purpose of the present invention, can adopt the combination of various conditions or condition.
(embodiment 1)
Prepare the steel plate of thickness of slab 50mm～100mm, the feature and the performance of test, investigation welding point.It the results are shown in table 1.In addition, the chemical composition with the welding material of the chemical composition (steel grade) of used steel (steel plate) and butt joint weld part is shown in table 3 and table 4 respectively.
Welding method is used VEGA, VAGA-II, EG and SAW.Welding condition separately is shown in table 2.
In addition, about groove, in the occasion of VEGA, bevel angle is taken as 20 ° V word groove, and the root gap of weld is taken as 8mm; In the occasion of VAGA-II and EG, bevel angle is taken as 20 ° V word groove, and the root gap of weld is taken as 8mm; And in the occasion of SAW, bevel angle is taken as 40 ° Y word groove, and the root gap of weld is taken as 2mm.
Hv (BM) is the mean value by the hardness on the mother metal thickness of slab direction of the indentation assaying of 10kg.Hv (WM) is in the central portion of the weld metal thickness of slab hardness number by the indentation assaying of 10kg.
Weld width is the surface at weld metal, the mean value of 3 mensuration in the back side and thickness of slab center.
The softening width of HAZ is the width from the zone of welding melt run when the mother metal direction detection is more regional than the HAZ of the hardness softening 5% of mother metal.
The former γ crystal grain diameter of HAZ, be with the original austenite grain in the HAZ district that is connected of welding melt run according to the diameter of equivalent circle souvenir.
About the performance of welding point, its fracture transition temperature vTrs (℃) be to use according to as the welding melt run (FL) of the most fragile of the welding point part test film of taking like that in the thickness of slab central authorities of test film, change test temperature and the result that obtains.
Its fracture toughness value Kc (N/mm1.5), it is the value of in above-mentioned stramazon test, under-20 ℃ test temperature, obtaining, be marked with the value of symbol "＞", the notch that is illustrated in test film fully is out of shape, can confirm the vestige of toughness be full of cracks, because the width of test film is 400mm, so can not surpass its above Kc value by instrumentation.
Its joint tensile strength (Mpa) is to make the result that the NKU1 test film carries out joint straight draw test, the intensity of expression fracture.
As shown in table 1, the No.1 of example of the present invention～17, various conditions are in the scope of the present invention's regulation, and the Kc value shows value fully.
In these examples of the present invention, because Hv (the WM)/Hv (BM) of No.1～14 and weld width/thickness of slab, HAZ soften width within the scope of the invention, so the Kc value of welding point and joint tensile strength all show sufficient value.
In addition, the present invention's example No.14, though because the softening width of HAZ is littler than the present invention preferred range, so the Kc value is more lower slightly than the routine No.1 of the present invention～13, nonetheless also shows 3000N/mm
1.5Or its above good value.
The present invention example No.15, the vTrs that obtains by Charpy-type test for the level of No.1～14 same degree of example of the present invention, the Kc value corresponding with it also is sufficient value, but owing to Hv (WM)/Hv (BM) is lower than preferred range, so strength of joint is low.
The present invention's example No.16 and 17 is because weld width/thickness of slab exceeds preferable range of the present invention, so strength of joint is low.
Relative therewith, comparative example No.18～22, because Hv (WM)/Hv (BM) exceeds set upper limit value of the present invention, although the vTrs and the present invention's example No.1～17 that are obtained by Charpy-type test have the level of same degree, the Kc value of welding point is low.
Therefore, the present invention is to be the welding point of 50mm or the steel plate more than it for YP in 470Mpa or the high strength more than it and thickness of slab, is suitable in guaranteeing suitable Kc value, and from this point, the present invention is new invention.
Table 1
| NO. | Butt welded joint | The feature of welding point | The performance of welding point | ||||||||||||
| Steel grade | Thickness of slab (mm) | Mother metal tensile strength (MPa) | Welding method | Welding condition | Hv(BM) | Hv(WM) | Hv(WM)/ Hv(BM) | Weld width/thickness of slab | HAZ softens width (mm) | The thick γ crystal grain diameter (μ m) of HAZ | The vTrs of Charpy-type test (℃) | Kc (N/mm 1.5) | Joint tensile strength (MPa) | ||
| Example of the present invention | 1 | YP47 | 70 | 630 | VEGA-II | EG-60M1 | 202 | 212 | 1.05 | 0.45 | 12 | 180 | -5 | 4980 | 610 |
| 2 | YP47 | 70 | 620 | EG | EG-60M2 | 204 | 200 | 0.98 | 0.67 | 15 | 190 | -10 | ＞5200 | 602 | |
| 3 | YP47 | 65 | 650 | EG | EG-60M3 | 210 | 151 | 0.72 | 0.66 | 13 | 170 | -1 | 4200 | 590 | |
| 4 | YP47 | 70 | 643 | VEGA-II | EG-60M4 | 205 | 226 | 1.1 | 0.51 | 15 | 150 | -3 | 4890 | 620 | |
| 5 | YP40 | 70 | 570 | VEGA-II | EG-3 | 175 | 186 | 1.06 | 0.4 | 18 | 165 | -25 | ＞5100 | 615 | |
| 6 | YP47 | 60 | 630 | VEGA-II | EG-60M1 | 215 | 204 | 0.95 | 0.46 | 16 | 175 | 2 | 4100 | 623 | |
| 7 | YP47 | 55 | 620 | VEGA | EG-60M1 | 210 | 208 | 0.99 | 0.61 | 7 | 55 | -30 | ＞5100 | 598 | |
| 8 | YP47 | 70 | 610 | VEGA-II | EG-60M3 | 200 | 206 | 1.03 | 0.45 | 17 | 120 | -3 | 4230 | 602 | |
| 9 | YP47 | 50 | 605 | SAW | EG-60M1 | 195 | 205 | 1.05 | 0.68 | 8 | 45 | -15 | 5100 | 620 | |
| 10 | YP47 | 65 | 602 | SAW | EG-60M2 | 210 | 227 | 1.08 | 0.5 | 11 | 58 | -23 | ＞5100 | 615 | |
| 11 | YP47 | 75 | 610 | SAW | EG-60M3 | 204 | 222 | 1.09 | 0.67 | 8 | 75 | -10 | 4850 | 610 | |
| 12 | YP40 | 80 | 580 | VEGA-II | EG-3 | 183 | 134 | 0.73 | 0.4 | 12 | 280 | 3 | 4100 | 590 | |
| 13 | YP47 | 100 | 634 | VEGA-II | EG-60M4 | 210 | 200 | 0.95 | 0.35 | 13 | 190 | -8 | 4250 | 610 | |
| 14 | YP47 | 55 | 640 | SAW | EG-60M1 | 210 | 208 | 0.99 | 0.61 | 3 | 55 | -25 | 3520 | 598 | |
| 15 | YP47 | 70 | 635 | EG | EG-60M2 | 205 | 133 | 0.65 | 0.51 | 15 | 150 | -6 | 4720 | 502 | |
| 16 | YP47 | 70 | 650 | VEGA-II | EG-60M1 | 220 | 224 | 1.02 | 1.2 | 18 | 165 | -28 | ＞5100 | 490 | |
| 17 | YP47 | 60 | 634 | SEG-II | EG-60M3 | 215 | 204 | 0.95 | 0.8 | 16 | 175 | -10 | 4100 | 520 | |
| Comparative example | 18 | YP47 | 70 | 621 | VEGA-II | EG-60 | 202 | 265 | ※1.31 | 0.45 | 12 | 180 | -4 | 980 | 610 |
| 19 | YP47 | 70 | 636 | EG | EG-60 | 204 | 235 | ※1.15 | 0.67 | 15 | 190 | -12 | 1500 | 602 | |
| 20 | YP47 | 65 | 601 | EG | EG-60 | 210 | 258 | ※1.23 | 0.66 | 13 | 170 | -5 | 950 | 590 | |
| 21 | YP47 | 70 | 633 | VEGA-II | EG-60M | 204 | 235 | ※1.15 | 1.2 | 15 | 190 | -8 | 1500 | 460 | |
| 22 | YP47 | 65 | 640 | VEGA-II | EG-60M | 210 | 258 | ※1.23 | 0.8 | 13 | 170 | -3 | 950 | 480 | |
※: outside the scope of the invention
Table 2
| Welding method | Welding condition | Thickness of slab (mm) | Electric current I (A) | Voltage E (V) | Speed of welding v (cm/min) | Heat input (kJ/cm) | Core diameter (mm) | |
| VEGA | VS1 | 50 | 400 | 40 | 2.9 | 331 | 1.6 | |
| VS2 | 55 | 400 | 40 | 2.5 | 383 | 1.6 | ||
| VS3 | 60 | 400 | 40 | 2.2 | 439 | 1.6 | ||
| VS4 | 65 | 400 | 40 | 1.9 | 498 | 1.6 | ||
| VEGA-II | V1 | 55 | 420 | 42 | 6.5 | 326 | 1.6 | |
| V2 | 60 | 420 | 42 | 6.0 | 353 | 1.6 | ||
| V3 | 70 | 420 | 42 | 4.5 | 470 | 1.6 | ||
| V4 | 80 | 420 | 42 | 4.0 | 529 | 1.6 | ||
| V5 | 100 | 440 | 44 | 3.5 | 664 | 1.6 | ||
| EG | E1 | 60 | 420 | 42 | 3.0 | 353 | 1.6 | |
| E2 | 65 | 420 | 42 | 2.5 | 423 | 1.6 | ||
| E3 | 70 | 420 | 42 | 2.1 | 504 | 1.6 | ||
| | 1 welding | S1 | 55 | Go ahead of the rest 2100 | 42 | 18 | 571 | 6.4 |
| Back row 1600 | 52 | 6.4 | ||||||
| 7 welding | S2 | 65 | Go ahead of the rest 1400 | 37 | 40 | 159 | 6.4 | |
| Back row 1200 | 45 | 6.4 | ||||||
| S3 | 75 | Go ahead of the rest 1400 | 37 | 35 | 181 | 6.4 | ||
| Back row 1200 | 45 | 6.4 | ||||||
Table 3 (mass%)
| Steel grade | C | Si | Mn | P | S | Ni | Ti |
| YP40 | 0.11 | 0.21 | 1.3 | 0.006 | 0.003 | 0.01 | |
| YP47 | 0.08 | 0.24 | 1.22 | 0.007 | 0.002 | 1.02 | 0.01 |
Table 4
(mass％)
| Welding material | C | Si | Mn | P | S | Mo | Ni |
| EG-1 | 0.10 | 0.33 | 1.45 | 0.015 | 0.010 | 0.27 | |
| EG-3 | 0.08 | 0.29 | 1.85 | 0.011 | 0.008 | 0.15 | |
| EG-60 | 0.10 | 0.34 | 1.68 | 0.016 | 0.100 | 0.29 | |
| EG-60M | 0.08 | 0.29 | 1.81 | 0.011 | 0.010 | 0.00 | 4.10 |
| EG-60M1 | 0.07 | 0.29 | 1.81 | 0.011 | 0.010 | 0.10 | 1.50 |
| EG-60M2 | 0.06 | 0.29 | 1.81 | 0.007 | 0.006 | 0.12 | 3.10 |
| EG-60M3 | 0.03 | 0.29 | 1.81 | 0.011 | 0.010 | 0.25 | 1.00 |
| EG-60M4 | 0.11 | 0.31 | 2.10 | 0.008 | 0.003 | 0.24 | 0.50 |
Industrial utilizability
According to the present invention, Large Heat Input Welding joint for the large high-strength steel sheet of high strength and thickness of slab, even weld defect or fatigue cracking produce, expansion just in case exist, also be difficult to occur brittle fracture, so can prevent such fatal damage, the damage of welding structural body fracture.
Therefore, the present invention can bring into play the remarkable result of the security that significantly improves welding structural body, is the high invention of industrial value.
Claims
(according to the modification of the 19th of treaty)
Statement according to the 19th modification of carrying out of PCT treaty
Replace original right requirement book with amended claims.
Wherein, (1) adds the qualification feature of former claim 11 in the former claim 1～10; (2) deleted former claim 11.
In No. 3220406 communiques of Japan Patent (X document), the content of making the good high strength weld joints of anti-crackle on the steel plate of thickness of slab 50mm is disclosed.
On the other hand, the application is the good large-line energy butt welded joint of anti-brittle fracture occurrence features.
Like this,, welded structure is revised as " welding structural body that the high-strength steel sheet of the thick 50mm of surpassing of butt welding fishplate bar forms " by revising, thus the difference of the disclosed technology contents of No. 3220406 communique of clear and definite the present invention and patent (X document).
Intact
1. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of the welding structural body that the thick high-strength steel sheet that surpasses 50mm of butt welding fishplate bar forms,
(a1) hardness of weld metal be mother metal hardness 110% or below it.
2. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of the welding structural body that the thick high-strength steel sheet that surpasses 50mm of butt welding fishplate bar forms,
(a2) hardness of weld metal be mother metal hardness 70% or it is above, 110% or below it.
3. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of the welding structural body that the thick high-strength steel sheet that surpasses 50mm of butt welding fishplate bar forms,
(a1) hardness of weld metal be mother metal hardness 110% or below it, and
(b) width of weld metal be the mother metal thickness of slab 70% or below it.
4. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of the welding structural body that the thick high-strength steel sheet that surpasses 50mm of butt welding fishplate bar forms,
(a2) hardness of weld metal be mother metal hardness 70% or it is above, 110% or below it, and
(b) width of weld metal be the mother metal thickness of slab 70% or below it.
5. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of the welding structural body that the thick high-strength steel sheet that surpasses 50mm of butt welding fishplate bar forms,
(a1) hardness of weld metal be mother metal hardness 110% or below it,
(b) width of weld metal be the mother metal thickness of slab 70% or below it, and
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it.
6. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of the welding structural body that the thick high-strength steel sheet that surpasses 50mm of butt welding fishplate bar forms,
(a2) hardness of weld metal be mother metal hardness 70% or it is above, 110% or below it,
(b) width of weld metal be the mother metal thickness of slab 70% or below it, and
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it.
7. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of the welding structural body that the thick high-strength steel sheet that surpasses 50mm of butt welding fishplate bar forms,
(a1) hardness of weld metal be mother metal hardness 110% or below it,
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it, and
(d) the original austenite grain diameter of the weld affected zone (HAZ) that is connected with the welding melt run is at 200 μ m or below it.
8. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of the welding structural body that the thick high-strength steel sheet that surpasses 50mm of butt welding fishplate bar forms,
(a2) hardness of weld metal be mother metal hardness 70% or it is above, 110% or below it,
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it, and
(d) the original austenite grain diameter of the weld affected zone (HAZ) that is connected with the welding melt run is at 200 μ m or below it.
9. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of the welding structural body that the thick high-strength steel sheet that surpasses 50mm of butt welding fishplate bar forms,
(a1) hardness of weld metal be mother metal hardness 110% or below it,
(b) width of weld metal be the mother metal thickness of slab 70% or below it,
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it, and
(d) the original austenite grain diameter of the weld affected zone (HAZ) that is connected with the welding melt run is at 200 μ m or below it.
10. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of the welding structural body that the thick high-strength steel sheet that surpasses 50mm of butt welding fishplate bar forms,
(a2) hardness of weld metal be mother metal hardness 70% or it is above, 110% or below it,
(b) width of weld metal be the mother metal thickness of slab 70% or below it,
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it, and
(d) the original austenite grain diameter of the weld affected zone (HAZ) that is connected with the welding melt run is at 200 μ m or below it.
Claims (11)
1. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of welding structural body,
(a1) hardness of weld metal be mother metal hardness 110% or below it.
2. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of welding structural body,
(a2) hardness of weld metal be mother metal hardness 70% or it is above, 110% or below it.
3. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of welding structural body,
(a1) hardness of weld metal be mother metal hardness 110% or below it, and
(b) width of weld metal be the mother metal thickness of slab 70% or below it.
4. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of welding structural body,
(a2) hardness of weld metal be mother metal hardness 70% or it is above, 110% or below it, and
(b) width of weld metal be the mother metal thickness of slab 70% or below it.
5. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of welding structural body,
(a1) hardness of weld metal be mother metal hardness 110% or below it,
(b) width of weld metal be the mother metal thickness of slab 70% or below it, and
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it.
6. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of welding structural body,
(a2) hardness of weld metal be mother metal hardness 70% or it is above, 110% or below it,
(b) width of weld metal be the mother metal thickness of slab 70% or below it, and
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it.
7. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of welding structural body,
(a1) hardness of weld metal be mother metal hardness 110% or below it,
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it, and
(d) the original austenite grain diameter of the weld affected zone (HAZ) that is connected with the welding melt run is at 200 μ m or below it.
8. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of welding structural body,
(a2) hardness of weld metal be mother metal hardness 70% or it is above, 110% or below it,
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it, and
(d) the original austenite grain diameter of the weld affected zone (HAZ) that is connected with the welding melt run is at 200 μ m or below it.
9. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of welding structural body,
(a1) hardness of weld metal be mother metal hardness 110% or below it,
(b) width of weld metal be the mother metal thickness of slab 70% or below it,
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it, and
(d) the original austenite grain diameter of the weld affected zone (HAZ) that is connected with the welding melt run is at 200 μ m or below it.
10. the large-line energy butt welded joint that anti-brittle fracture occurrence features is good is characterized in that, in the butt welded joint of welding structural body,
(a2) hardness of weld metal be mother metal hardness 70% or it is above, 110% or below it,
(b) width of weld metal be the mother metal thickness of slab 70% or below it,
(c) width in the weld affected zone zone of 95% or its following hardness of softening hardness to the mother metal part that is not influenced by heat is 5mm or more than it, and
(d) the original austenite grain diameter of the weld affected zone (HAZ) that is connected with the welding melt run is at 200 μ m or below it.
11. the good large-line energy butt welded joint of each described anti-brittle fracture occurrence features according to claim 1～10 is characterized in that, above-mentioned welding structural body is the welding structural body that the high-strength steel sheet of the thick 50mm of surpassing of butt welding fishplate bar forms.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP362122/2003 | 2003-10-22 | ||
| JP2003362122 | 2003-10-22 | ||
| JP301823/2004 | 2004-10-15 |
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| CN1871094A true CN1871094A (en) | 2006-11-29 |
| CN100537108C CN100537108C (en) | 2009-09-09 |
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|---|---|---|---|
| CNB2004800308784A Expired - Fee Related CN100537108C (en) | 2003-10-22 | 2004-10-22 | High heat input butt welding joint exhibiting excellent characteristics in resistance to occurrence of brittle fracture |
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Cited By (7)
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| CN102271861A (en) * | 2009-01-14 | 2011-12-07 | 新日本制铁株式会社 | Weld structure having brittle fracture arresting characterstics |
| CN103143853A (en) * | 2013-03-26 | 2013-06-12 | 哈尔滨工业大学 | Joint shape design method for realizing equal bending bearing of low-match butt-joint joint with base metal |
| CN103874558A (en) * | 2011-10-03 | 2014-06-18 | 杰富意钢铁株式会社 | Welded steel pipe with excellent welding heat-affected zone toughness, and process for producing same |
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- 2004-10-22 CN CNB2004800308784A patent/CN100537108C/en not_active Expired - Fee Related
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| CN102271861A (en) * | 2009-01-14 | 2011-12-07 | 新日本制铁株式会社 | Weld structure having brittle fracture arresting characterstics |
| CN102271861B (en) * | 2009-01-14 | 2013-03-20 | 新日铁住金株式会社 | Weld structure having brittle fracture arresting characterstics |
| CN103874558A (en) * | 2011-10-03 | 2014-06-18 | 杰富意钢铁株式会社 | Welded steel pipe with excellent welding heat-affected zone toughness, and process for producing same |
| CN104822480A (en) * | 2012-11-29 | 2015-08-05 | 杰富意钢铁株式会社 | Circumferential weld joint for line pipe, method for forming circumferential weld joint for line pipe, and line pipe |
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| CN103143853A (en) * | 2013-03-26 | 2013-06-12 | 哈尔滨工业大学 | Joint shape design method for realizing equal bending bearing of low-match butt-joint joint with base metal |
| CN105598576A (en) * | 2016-03-29 | 2016-05-25 | 常熟理工学院 | Tough and well-matched great heat input electroslag welding connector |
| CN107478663A (en) * | 2017-10-16 | 2017-12-15 | 洛阳高昌机电科技有限公司 | A kind of multi-section type bridge pipeline weld and HAZ failure detector |
| CN107478663B (en) * | 2017-10-16 | 2019-10-08 | 唐山海港盛大工程质量检测有限公司 | A kind of multi-section type bridge pipeline weld and HAZ failure detector |
| CN107490589A (en) * | 2017-10-18 | 2017-12-19 | 洛阳高昌机电科技有限公司 | A kind of construction metallic conduit welded seam detects transillumination positioner |
| CN107490589B (en) * | 2017-10-18 | 2019-11-19 | 洛阳欣隆工程检测有限公司 | A kind of construction metallic conduit welded seam detection transillumination positioning device |
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